Komatsuengine(no series)

Komatsu VT-1710-1(S/N 576252-UP)

Maintenance schedule, common problems & OEM parts breakdown

Search live VT-1710-1(S/N 576252-UP) parts

The Komatsu VT-1710-1 (S/N 576252-UP) is a bare industrial diesel engine, not a complete machine: a Komatsu-built, Cummins-derived V12 of 28.0 L (1,710 cu in) displacement, with a 140 x 152 mm (5.5 x 6.0 in) bore and stroke and a compression ratio near 14:1. It is turbocharged only, without an aftercooler, which sets it apart from the higher-output aftercooled VTA-1710 family built on the same block. Fueling is by a Cummins PT (Pressure-Time) gear-pump injection system with a mechanical flyweight governor and a pneumatic AFC smoke limiter; there is no ECM, wiring harness, or fault-code readout, only analog gauges and a magnetic speed pickup for tachometer and governor reference. Factory ratings for this non-aftercooled line span roughly 373-522 kW (500-700 hp) across duty classes, with a 474 kW (635 hp) continuous rating on file at 2100 rpm governed. Komatsu built this V12 family under license from the 1960s onward for its largest crawler dozers, rigid-frame mining trucks, generator sets, and industrial and marine drives of that era, since no in-house Komatsu engine of the period matched its output. S/N 576252-UP marks a running production update within the VT-1710-1 line, and no single host chassis is confirmed for this exact serial range.

Within the wider Cummins V12 family, the split that matters is VT versus VTA. The turbocharged-only VT line arrived in 1960 rated near the 500-700 hp band; from 1968 Cummins added a water-cooled aftercooler to create the VTA-1710, pushing continuous output past 800 hp and eventually toward 980 hp on later ratings. Komatsu's own parts catalog treats VT-1710-1 and the aftercooled VTA-1710-1D as separate engines with different cylinder heads and fuel pump calibration, not interchangeable subassemblies, so ratings and parts do not cross over between them. The architecture traces back to the 1949-1968 V1486 series and, on the other end, continued long past this engine's era as the V28/VTA28, still built overseas for non-emissions markets. In the used and parts market today, this engine's appeal is its total lack of electronics: no ECM to fail, no sensors to chase, and a mechanical governor and PT pump that a qualified diesel shop can rebuild indefinitely. That keeps running cores and rebuildable long blocks in demand among owners of aging Komatsu dozers, haul trucks, marine vessels, and generator sets who need durable, field-serviceable power rather than an electronically controlled replacement, now that mechanical PT-fuel platforms in this class have grown scarce.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Komatsu VT-1710-1(S/N 576252-UP) specifications

Engine

Engine model	Komatsu-built VT-1710-1, S/N 576252-UP and up. V-12, four-stroke diesel from the 1710 cu in (28 L) big-block family, turbocharged without aftercooling. This serial break supersedes the earlier base VT-1710 production run and is a separate, lower-output line from the later aftercooled VTA-1710 series used on other Komatsu applications — do not mix ratings between the two.
Cylinders / configuration	12 cylinders, V-block, 7 main bearings, dual gear-driven camshafts (one per bank), roller-type cam followers.
Displacement	28.0 L (1710 cu in).
Bore x stroke	140 x 152 mm (5.50 x 6.00 in).
Gross power	Documented factory ratings for the non-aftercooled 1710 family span roughly 373-522 kW (500-700 hp) depending on duty class and governed speed; the continuous-duty rating on file is 474 kW (635 hp) at 2100 rpm governed. Treat as a rating-class range, not a single fixed figure — actual output depends on the duty rating (medium-duty commercial vs continuous) and the host-machine governor setting. Confirm against the engine data plate for this serial.
Aspiration	Turbocharged (twin turbochargers), not aftercooled. This is the key difference from the aftercooled VTA-1710 variant, which is rated substantially higher and is a different engine line.
Fuel system	Wear-compensating unit-metering fuel system with camshaft-actuated injectors and a mechanical flyball-type variable-speed governor. No electronic engine controls.
Emissions tier	Predates modern emissions certification. Mechanically governed, jacket-water aftercooled-free design, no exhaust aftertreatment.

Weights

Net dry weight	Approximately 3568 kg (7860 lbs) for the base engine with standard accessories. This is the bare power unit — it excludes any driven equipment (gearbox, alternator skid, etc.) fitted by the host machine builder.
Operating/shipping weight	Not published as a standalone figure. Installed operating weight depends on the host machine and its accessory package, not on the engine alone.

Dimensions

Overall envelope	Not published as a simple length/width/height summary for this engine. Factory installation drawings cover the full envelope, mounting-pad layout, and service-clearance dimensions; consult the engine installation drawing for exact figures.
Ground clearance / chassis dimensions	Not applicable — this is a bare power unit, not a complete machine. Chassis-level dimensions belong to the host equipment, not the engine.

Performance

Governed speed	2100 rpm on the documented continuous-duty rating for this engine family. Construction/industrial installations may govern lower depending on gearing and load.
Duty ratings	Factory performance data splits medium-duty commercial (average load factor, intermittent full-throttle use within a 24-hour period) from continuous-duty (24-hour, full-throttle) ratings. Horsepower and fuel consumption differ between the two duty classes at the same rpm.
Class-relevant output	Travel speed, drawbar pull, lift, dig, and dump performance are not applicable to a bare engine — those figures depend on the host machine's drivetrain and are outside the engine's own specification.

Service capacities (summary)

Engine oil (lube system)	68 L (18 US gal), aluminum rear-sump oil pan, force-feed lubrication to all bearings via a gear-type pump.
Cooling system	114 L (30 US gal) coolant capacity, belt-driven centrifugal coolant pump, dual modulating bypass thermostats.
Fuel tank	Not applicable to the bare engine — fuel tank capacity is set by the host machine, not the engine.
Hydraulic system	Not applicable — this is a diesel power unit, not a hydraulic component.

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

VT-1710-1(S/N 576252-UP) fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase, with oil filter change	Not published for this exact serial range in available factory literature. Sump volume on this V12 diesel varies with the oil pan and filtration setup fitted by the equipment builder (haul truck, generator set, marine, or pump-drive installation); confirm the exact fill with a Komatsu or Cummins dealer using the engine serial number before servicing.	Heavy-duty diesel engine oil at the API service class current for this engine's build era (CD/CE-class multigrade). Use a lighter multigrade, around 10W-30, for cold-weather starting; use 15W-40 or straight 40-weight oil for sustained hot-climate or heavy-load duty, per standard practice for this engine class.
Cooling system	Not published for this exact serial range. Coolant volume depends on the radiator or heat-exchanger circuit fitted by the equipment builder rather than being a fixed engine-only figure; verify against the host machine's own documentation.	Low-silicate ethylene-glycol antifreeze/coolant mixed to the standard heavy-duty ratio for the operating climate, with a supplemental coolant additive (SCA) charge maintained on schedule to control liner cavitation and corrosion.
Fuel system	Fuel tank size is set by the equipment builder, not the engine, and is not documented for this serial range.	No. 2-D diesel fuel for normal service; No. 1-D diesel in cold climates. Keep the primary fuel filter/water separator element serviced on interval.
Grease points (accessory drive and linkage)	Not a bulk fill — applied per point until purge, no chart quantity documented for this serial range.	Multipurpose lithium-based EP (extreme-pressure) chassis grease, NLGI grade 2.
Transmission / final drive / hydraulic system / axles	Not applicable to this catalog entry.	This is a bare-engine parts entry for a V12 diesel cataloged by Komatsu, not a complete machine. It was fitted across different equipment types (mechanical-drive haul trucks, generator sets, marine propulsion, and industrial pump/compressor drives), each with its own transmission, final drive, axle, and hydraulic fluid specs supplied by the equipment builder. No single powertrain or hydraulic fluid recommendation applies; consult the specific host machine's own operation and maintenance manual.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Komatsu VT-1710-1(S/N 576252-UP) maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level on the dipstick before starting, engine off and cold Check coolant level and look for any sheen or smell of fuel or oil in the coolant Drain water and sediment from the primary fuel filter/water separator Check water pump and cooling fan drive-belt tension and condition Watch startup and load-transition smoke color (blue, black, or persistent white) as an early diagnostic Wipe down and inspect the PT pump and AFC housing for fuel weeping
Every 250 h	Change engine lube oil and the full-flow oil filter Replace primary and secondary PT fuel filters Pull a coolant sample and test/top up the SCA additive package Retorque accessory-drive and engine-mount fasteners to spec Clean the air intake piping and check the turbocharger compressor housing for oil residue
Every 500 h	Service or replace the air cleaner element per the restriction indicator Check turbocharger shaft end-play and bearing play by hand Inspect the water pump seal for weep and the fan hub bearing for play Check the magnetic speed-pickup gap and its wiring and ground connections Inspect the PT pump drive coupling and governor linkage for backlash
Every 1,000 h	Adjust valve lash, intake and exhaust, on the factory cold-set firing sequence Set injector plunger (zero-lash) adjustment on the same firing sequence Flush and refill the cooling system and retest SCA concentration Replace the crankcase breather element and check the vent tube for restriction Run a compression and blow-by check and inspect the engine mounts
Every 2,000 h	Remove, bench-test, and recalibrate the PT fuel pump, including governor droop and the AFC fuel curve Pull injectors for flow testing and recondition or replace as needed Inspect the turbocharger cartridge for shaft play and oil seepage; rebuild or exchange if out of limits Re-torque cylinder head fasteners in the factory cold sequence Tear down and inspect the cooling circuit: radiator/heat-exchanger core, hoses, thermostats, and water manifold
Every 8,000 h	Replace cylinder liners, pistons, rings, and connecting rod bearings as a matched set Recondition cylinder heads: valves, seats, and guides Replace elastomer seals and gaskets throughout the top end Exchange the turbocharger cartridge and rebuild the PT pump and injectors together
Every 16,000 h	Pull the engine and split the block for full internal inspection Replace main and rod bearings, thrust washers, and gear-train bushings Inspect, regrind, or replace the crankshaft, and inspect the camshafts and followers Re-machine or replace cylinder liner bores and align-bore the main bearing saddles as needed Test and recondition the coolant jacket and oil cooler core for cavitation and corrosion damage

Servicing the VT-1710-1(S/N 576252-UP) beyond the schedule

Predictive Maintenance & Fluid Analysis

This engine has no ECM and no fault codes, so oil and coolant sampling are the main early warning tools. Pull an oil sample at every drain and watch for fuel dilution, a sign of PT pump seal or injector wear, and coolant markers flagging wet-liner seepage into the crankcase. Titrate coolant SCA levels on schedule; cavitation pitting on the wet liners is the quiet failure mode here. Log boost pressure and exhaust temperature by hand each shift, since drift is the only warning of AFC or turbo trouble.

Corrective & Common Repairs

Common failures on this V12 center on the PT pump, wet-liner seals, and the single turbocharger. Governor or AFC wear shows up as power loss, black smoke, or an erratic idle, and calls for pump removal and bench calibration, not field guesswork; a restricted AFC signal line often gets misdiagnosed as a bad pump. After fuel-side service, purge trapped air with a run-cycle-shutdown sequence before condemning the pump. Liner seepage into the coolant, water pump seal weep, and turbo shaft play from cold-start oil starvation round out the corrective jobs.

Overhaul & Rebuild Points

Overhaul work centers on the wet-liner block, the crankshaft, and the PT fuel system as a matched set. Rebuild liners, pistons, rings, and rod bearings together, never as single-cylinder spot repairs, to keep compression and bearing clearances even across the V. Recondition heads with new valves, seats, and guides, and send the PT pump and injectors out together so fuel delivery stays balanced bank to bank. Exchange the turbocharger cartridge rather than patch it, and re-torque head fasteners in the factory cold sequence before startup.

Seasonal & Environment Servicing

Cold starts are the weak point on a mechanical PT engine this size: use starting aids as specified, protect the fuel system from wax with a heater or heated filter housing, and confirm coolant SCA and glycol strength before winter. In hot or high-altitude service, watch exhaust temperature closely; this is the turbocharged-only, non-aftercooled build, with less charge-air cooling margin than its aftercooled sibling. There is no ECM to auto-derate, so idle speed and fuel settings need manual field adjustment as conditions or elevation change.

VT-1710-1(S/N 576252-UP) common service parts

Part number	Part	Notes
09645-20220	Plate? Instruction,Engine Oil Filter (French)	Lubrication service	Check fitment →
09645-70120	Plate? Instruction,Engine Oil Filter (Spanish)	Lubrication service	Check fitment →
6631-51-5000	Oil Filter Ass'Y	Lubrication service	Check fitment →
6715-52-5460	Gasket,Oil Filter And Cooler	Lubrication service	Check fitment →
CUAR-12990	Oil Filter Ass'Y	Lubrication service	Check fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

VT-1710-1(S/N 576252-UP) attachments & work tools

Host machine and scope

This is a bare engine model, not a complete machine, so work tools and attachments are governed by the chassis it is installed in, not the engine itself. Parts documentation for this engine family overlaps Komatsu's large crawler-dozer line and its rigid-frame mining dump-truck line from the same era; the exact chassis for this specific serial range is not confirmed in available documentation, so confirm host machine and options against the machine (not engine) serial number with a dealer.

Dozer blade options (crawler-dozer host class)

For the large crawler-dozer class built around this engine family, factory blade choices are a straight dozing blade roughly 4.9 m (16 ft) wide or a full U-blade roughly 6 m (20 ft) wide for high-volume push and stockpile work. Blade width and capacity vary by configuration/series.

Ripper attachment (crawler-dozer host class)

A rear-mounted, single-shank heavy ripper is the standard ripping attachment for this dozer class, used for hard-material and rock ripping ahead of dozing passes. Multi-shank ripper configurations are not typically offered at this size class.

Blade and ripper mounting/hydraulics

The dozer blade mounts on a C-frame/trunnion push-arm arrangement with hydraulic tilt and lift cylinders; the ripper shank rides on a parallelogram linkage with its own hydraulic lift and crowd cylinders. Both draw from the machine's implement hydraulic system rather than from the engine directly, so no engine-side hydraulic kit is required to fit them.

Dump body and tailgate options (rigid dump-truck host class)

For the rigid-frame mining dump-truck class built around this engine family, bodies are offered in standard rock-hauling and higher-capacity/coal configurations, with tailgate options ranging from fixed or hinged tailgates to later automatic-opening styles retrofit to this truck family. Body capacity and tailgate style vary by configuration/series and by truck generation.

Body mounting and hoist hydraulics

Dump bodies pin-mount to the truck frame and pivot on a rear hinge, raised by a frame-mounted hydraulic hoist circuit independent of the engine's own systems. Tailgate actuation, where fitted, uses its own dedicated hydraulic or mechanical linkage.

Factory guarding and duty options

Heavy-duty undercarriage and frame guarding, plus reinforced cab/ROPS guarding, are typical factory options across this dozer and truck class for mining and quarry duty. Availability of specific guarding packages for this exact serial range is not documented; verify current option lists with a dealer.

All VT-1710-1(S/N 576252-UP) assemblies by section

Every catalogued assembly group for the Komatsu VT-1710-1(S/N 576252-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Accessory

Komatsu : Vt-1710-1(S/N 576252-Up) : Accessory : Air Compressor

01***25	Washer,Spring?(Sandy And Dusty Spec.)	6
01***29	Washer,Spring (Cold Weather Spec.)	6
01***16	Washer,(For 35a Alternator)	4
02***22	Bolt	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Accessory : Air Compressor And Mounting

01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
01***29	Washer,Spring (Cold Weather Spec.)	3
01***34	Washer,Spring	4
01***16	Washer,(For 35a Alternator)	2

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Cooling And Electrical Systems

Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Alternator (Delco-Remy)

CU***71	Resistor	3
CU***06	Washer	1
CU***00	Grommet	1
CU***94	Screw	4

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Alternator And Mounting

01***29	Washer,Spring (Cold Weather Spec.)	1
01***38	Washer,Radio Controlled Slag Handling	3
01***57	Washer,Spring	1
01***23	Washer,(A)(W/After Cooler)(S6d155-4b)	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Alternator Drive

01***38	Washer,Radio Controlled Slag Handling	4
02***19	Key	1
02***22	Key	1
02***04	Plug,(For Shipping)	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Cooling Fan And Tension Pulley

01***20	Bolt,(Sandy? Dusty Terrain Spec.)	2
01***20	Bolt	1
01***10	Nut,(Dust?Drip Proof? Trimming S.)	1
01***29	Washer,Spring (Cold Weather Spec.)	11

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Corrosion Resistor

01***29	Washer,Spring (Cold Weather Spec.)	8
01***23	Washer,(A)(W/After Cooler)(S6d155-4b)	4
02***38	Capscrew	8
07***00	Valve,Drain	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Starting Motor (Delco-Remy)

CU***43	Holder	3
CU***78	Nut	1
CU***36	Lead	1
CU***47	Washer	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Starting Motor And Mounting

01***45	Bolt,(For Slag Handling)	3
01***48	Washer,Spring? Single Flange	3
CU***64	Strap,(Not Shown)	1
(C***6)	Starting Motor Ass'Y	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Water Pump And Tension Pulley(#713977-)

07***00	Valve,Drain	1
CU***40	Bushing	1
CU***66	Seal	2
CU***78	Gasket	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cooling And Electrical Systems : Water Pump(#576252-713976)

01***29	Washer,Spring (Cold Weather Spec.)	14
01***34	Washer,Spring	4
02***25	Bolt,(Europe Spec.)	9
02***04	Plug,(For Shipping)	1

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Cylinder Block

Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Camshaft

02***04	Plug,(For Shipping)	2
66***30	Washer,Thrust	2
CU***00	Key	2
CU***27	Gear,R.H	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Crankshaft And Vibration Damper

02***04	Plug,(For Shipping)	14
66***80	Pin,Dowel	2
67***10	Pulley	1
CU***90	Key	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Cylinder Block

01***38	Washer,Radio Controlled Slag Handling	1
02***04	Plug,(For Shipping)	19
02***06	Plug,(Not Shown)	2
02***10	Plug (Heater Not Installed)	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Flywheel And Flywheel Housing(#576252-830881)

01***48	Washer,Spring? Single Flange	22
02***57	Bolt	8
02***76	Bolt	14
02***38	Pin,Dowel	3

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Flywheel And Flywheel Housing(#830882-830882)

01***48	Washer,Spring? Single Flange	14
02***57	Bolt	8
02***76	Bolt	14
02***38	Pin,Dowel	3

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Flywheel And Flywheel Housing(#830883-841986)

01***48	Washer,Spring? Single Flange	14
02***57	Bolt	8
02***76	Bolt	14
02***38	Pin,Dowel	3

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Flywheel And Flywheel Housing(#841987-841987)

01***48	Washer,Spring? Single Flange	14
02***57	Bolt	8
02***76	Bolt	14
02***38	Pin,Dowel	3

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Flywheel And Flywheel Housing(#841988-845748)

01***48	Washer,Spring? Single Flange	14
02***57	Bolt	8
02***76	Bolt	14
02***38	Pin,Dowel	3

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Flywheel And Flywheel Housing(#845749-)

01***48	Washer,Spring? Single Flange	14
02***57	Bolt	8
02***76	Bolt	14
02***38	Pin,Dowel	3

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Gear Case Cover And Front Support

01***29	Washer,Spring (Cold Weather Spec.)	36
01***38	Washer,Radio Controlled Slag Handling	16
02***32	Bolt	2
02***38	Capscrew	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Hand Hole Cover

01***20	Washer,Spring	2
02***06	Nut,Radio Controlled Slag Handling	2
02***20	Washer,Radio Controlled Slag Handling	2
02***10	Plug (Heater Not Installed)	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Oil Pan

01***29	Washer,Spring (Cold Weather Spec.)	45
01***48	Washer,Spring? Single Flange	4
01***16	Washer,Radio Controlled Slag Handling	45
01***26	Washer,Spring	4

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Piston And Connecting Rod

66***20	Nut	2
66***31	Washer,Hard	2
67***31	Piston Ring Ass'Y	12
67***10	Pin,Piston	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Rear Cover

01***29	Washer,Spring (Cold Weather Spec.)	8
02***32	Bolt	8
CU***71	Seal,Oil	1
CU***43	Gasket,Rear Cover Plate	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Tappet And Push Rod

66***30	Socket,Socket	2
CU***84	Washer	36
CU***89	Sleeve	1
CU***28	Guide	36

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Block : Water Header Cover

01***29	Washer,Spring (Cold Weather Spec.)	34
02***32	Bolt	8
02***14	Plug (Heater Not Installed)	1
CU***69	Plug	1

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Cylinder Head

Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Air Intake Manifold And Connection

01***25	Washer,Spring?(Sandy And Dusty Spec.)	48
01***29	Washer,Spring (Cold Weather Spec.)	24
01***16	Washer,(For 35a Alternator)	40
01***16	Washer,Radio Controlled Slag Handling	24

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Compression Release

01***29	Washer,Spring (Cold Weather Spec.)	4
01***34	Washer,Spring	3
01***23	Washer	1
02***51	Bolt	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Cylinder Head

01***25	Washer,Spring?(Sandy And Dusty Spec.)	14
02***04	Plug,(For Shipping)	6
02***10	Plug (Heater Not Installed)	1
66***40	Guide,Crosshead Valve	6

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Exhaust Manifold And Turbocharger Mounting

01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
01***38	Washer,Radio Controlled Slag Handling	36
01***16	Washer,(For 35a Alternator)	2
02***19	Bolt	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Locker Arm And Housing

01***38	Washer,Radio Controlled Slag Handling	48
02***89	Bolt	48
02***04	Plug,(For Shipping)	2
02***16	Plug	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Locker Arm Housing Cover

01***16	Bolt,(For Slag Handling)	2
01***45	Bolt,(Cold Terrain Spec.)	2
01***10	Nut,(Dust?Drip Proof? Trimming S.)	2
01***25	Washer,Spring?(Sandy And Dusty Spec.)	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Turbocharger

01***20	Washer,Spring	16
02***16	Bolt,Water Bypass	16
66***10	Bearing	1
66***40	Clamp	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Cylinder Head : Water Manifold And Connection

01***29	Washer,Spring (Cold Weather Spec.)	32
02***25	Bolt,(Europe Spec.)	4
02***32	Bolt	4
02***12	Washer,Spring	8

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Fuel System

Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Accessory Drive

01***34	Washer,Spring	5
02***32	Bolt	5
02***19	Key	1
02***25	Key	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Cold Starting Aid

07***26	Tube,Protection	2
67***31	Cylinder Ass'Y	1
67***60	Plate? Caution,Ethel Spray (French)	1
67***60	Plate? Caution,(German)	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Fuel Filter

01***38	Washer,Radio Controlled Slag Handling	2
67***30	Plate? Caution	1
CU***73	Plug	2
CU***89	Bolt	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Fuel Tubing(#576252-726197)

01***29	Washer,Spring (Cold Weather Spec.)	1
02***13	Bolt	1
66***12	Connector,Fuel Outlet	3
67***10	Connector	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Fuel Tubing(#738655-)

01***29	Washer,Spring (Cold Weather Spec.)	1
02***13	Bolt	1
66***12	Connector,Fuel Outlet	3
CU***57	Tube	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Injector

67***10	Adapter,Injector	1
67***11	Cup	1
67***30	O-Ring,Injector	3
67***60	Gasket	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Pt Fuel Pump (1/4) (Ptg Auto? With Afc)

66***20	O-Ring,Throttle Shaft	1
66***10	Gasket,Front Cover	1
CU***37	Bolt	1
CU***97	Spring	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Pt Fuel Pump (2/4) (Ptg Auto? With Afc)

CU***00	Cover	1
CU***64	Seal (K2)	1
CU***40	Pt Fuel Pump Ass'Y	1
CU***60	Washer,Spring	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Pt Fuel Pump (3/4) (Ptg Auto? With Afc)

66***21	Gasket,Spring Pack Cover	1
CU***-A	Shim? 0.010inch	0
CU***40	Pt Fuel Pump Ass'Y	1
CU***32	Plunger	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Pt Fuel Pump (4/4) (Ptg Auto? With Afc)

02***32	Bolt	1
02***45	Bolt	2
02***16	Washer,Radio Controlled Slag Handling	5
66***50	Bolt	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Fuel System : Pt Fuel Pump Damper And Gear Pump

02***32	Bolt	2
02***45	Bolt	2
02***12	Washer,Spring	4
66***50	Bolt	2

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Lubricating Oil System

Komatsu : Vt-1710-1(S/N 576252-Up) : Lubricating Oil System : Lubricating Oil By-Pass Filter

01***25	Washer,Spring?(Sandy And Dusty Spec.)	2
02***32	Bolt	2
02***01	O-Ring (Kit)	1
09***20	Plate? Instruction,Full Flow Filter (For Kt1150)	2

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Komatsu : Vt-1710-1(S/N 576252-Up) : Lubricating Oil System : Lubricating Oil Cooler And Mounting(#830882-)

01***10	Washer,Spring	1
01***38	Washer,Radio Controlled Slag Handling	16
02***13	Bolt	1
02***32	Bolt	6

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Komatsu : Vt-1710-1(S/N 576252-Up) : Lubricating Oil System : Lubricating Oil Filter And Cooler(#576252-830881)

01***29	Washer,Spring (Cold Weather Spec.)	15
01***38	Washer,Radio Controlled Slag Handling	8
02***38	Capscrew	7
02***95	Bolt	8

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Komatsu : Vt-1710-1(S/N 576252-Up) : Lubricating Oil System : Lubricating Oil Filter(#830882-)

01***25	Washer,Spring?For Additional Rear Lam	4
01***38	Washer,Spring	4
02***38	Bolt	4
02***32	Bolt,(A)(W/After Cooler)(S6d155-4b)	4

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Komatsu : Vt-1710-1(S/N 576252-Up) : Lubricating Oil System : Lubricating Oil Pump

02***32	Bolt	2
02***38	Capscrew	2
02***51	Bolt	14
02***64	Bolt,(Cold Weather Spec.)	1

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Komatsu : Vt-1710-1(S/N 576252-Up) : Lubricating Oil System : Oil Cooler Mounting(#576252-830881)

01***29	Washer,Spring (Cold Weather Spec.)	2
01***38	Washer,Radio Controlled Slag Handling	6
02***32	Bolt	6
67***70	Gasket (K1)	1

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Tool And Kit

Komatsu : Vt-1710-1(S/N 576252-Up) : Tool And Kit : Service Kit

02***16	O-Ring (K2)	4
02***43	O-Ring,Water Manifold	4
06***04	Seal,Bearing (K4)	2
07***34	O-Ring,(-40 Deg. Spec.) (Kit)	2

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VT-1710-1(S/N 576252-UP) serial number reference

On this engine family the dataplate is mounted on the engine block itself, separate from the host machine's own chassis PIN plate, typically low on one side near the fuel pump or flywheel housing on this Cummins-derived construction. It reads the full model code (VT-1710-1) together with the plain numeric running serial; there is no letter prefix ahead of the digits on this series, so the serial alone (576252 and up) marks this build against earlier VT-1710-1 production.

Prefix	Identifies	Notes
576252-UP (no 3-character alpha PIN prefix)	VT-1710-1 base arrangement - turbocharged, non-aftercooled build of the big-bore V12 diesel Komatsu built under its 1960s technology-license agreement with Cummins	This engine family carries a plain numeric running serial on its dataplate rather than a 3-letter alpha PIN code; the model designation (VT-1710-1) plus that serial number is what identifies the build. Komatsu built this V12 under a technology-license arrangement with Cummins from the early 1960s for its largest dozers and off-highway trucks of that era, since no in-house Komatsu engine of the time matched its horsepower. The non-aftercooled VT-1710-1 is a separate parts-catalog entry from the aftercooled VTA-1710-1 family (arrangements 1A-1D), which runs at higher output. Those aftercooled arrangements are documented against specific hosts - a large crawler dozer and several rigid-frame haul trucks - each on its own separate serial-number sequence tied to its own model designation, so they do not correspond to this VT-1710-1 (S/N 576252-UP) build. No source ties S/N 576252-UP itself to a specific host chassis model; treat the exact machine fitment as unconfirmed and check with a dealer using the machine's own chassis PIN.

Frequently asked questions

What engine does the Komatsu VT-1710-1 (S/N 576252-UP) use?

This listing is the engine, not a machine that carries one. It is a Komatsu-built, Cummins-derived V12 diesel of 28.0 L (1,710 cu in), with a 140 x 152 mm (5.5 x 6.0 in) bore and stroke, turbocharged without an aftercooler. It runs a Cummins PT (Pressure-Time) mechanical fuel system with a flyweight governor and an AFC smoke limiter, and it has no ECM or fault-code system. Factory ratings for this non-aftercooled line span roughly 500-700 hp (373-522 kW), with a 635 hp (474 kW) continuous rating on file at 2100 rpm governed.

What does the Komatsu VT-1710-1 (S/N 576252-UP) weigh?

As a bare power unit with standard accessories, factory documentation puts dry weight at approximately 3,568 kg (7,860 lb). That figure excludes any gearbox, alternator skid, or other driven equipment added by whoever built the machine around it. No specific host chassis is confirmed for this exact serial range, so there is no separate machine operating weight to quote here, only the engine's own weight.

What replaced the Komatsu VT-1710-1?

Within the same Cummins-derived family, the turbocharged-only VT-1710 was effectively superseded from 1968 by the aftercooled VTA-1710, which used the same basic block but added a water-cooled charge cooler for meaningfully higher continuous output. Komatsu's parts catalog treats the two as separate engines, not interchangeable. Longer term, this mechanical PT/AFC platform aged out of new-equipment production as electronically controlled, emissions-regulated big-bore diesels took over the class, though the broader architecture survived overseas as the V28/VTA28 for non-emissions markets.

What VT-1710-1(S/N 576252-UP) owners discuss

What engine is the VT-1710-1 and how does it differ from the aftercooled VTA version?

The VT-1710-1 is a Cummins-built, narrow-angle V12 diesel of roughly 28 L (1,710 cu in) displacement, with a bore and stroke near 140 x 152 mm (5.5 x 6.0 in) and a compression ratio around 14:1. It uses the PT (Pressure-Time) fuel system, an early Cummins gear-pump-driven injection design, and is turbocharged without an aftercooler (the 'VT' designation). The aftercooled sibling, VTA-1710, adds a water-cooled charge cooler and supports a higher continuous power band. Confirm the rating plate suffix before assuming horsepower or parts interchange between VT and VTA variants; they are cataloged and parted out separately.

What do operators say about real-world power delivery and fuel burn?

This engine family has a reputation for being simple and hard to kill: mechanical governor, no electronics, and a fuel curve set by pump calibration rather than software. Full-load fuel consumption on high-output ratings within this architecture has been documented around 170-180 L/hr (roughly 45-50 gal/hr), but actual burn tracks load and the specific rating plate closely, so treat any single figure as a ballpark rather than a spec for every configuration. Boost on the non-aftercooled VT turbo setup runs in the neighborhood of 1.1 bar (about 16 psi); expect it to run hotter under sustained heavy load than an aftercooled VTA doing the same work.

What's the most commonly flagged wear pattern on these engines?

Cylinder liner cavitation erosion. Like other Cummins wet-sleeve designs, the liners sit in direct contact with coolant, and combustion-induced vibration can collapse microscopic bubbles against the liner's outer wall, pitting the metal over years of service. The fix is preventive, not reactive: keep the coolant additive package (a DCA/SCA-type nitrite treatment) topped up and test it on a regular interval. Shops that let coolant chemistry lapse report liner pitting severe enough to perforate, letting coolant into the oil. Have a qualified engine shop verify coolant additive history and run a coolant condition check before putting a used unit into extended service.

What quirks show up in the PT fuel system and mechanical governor?

The PT system behaves differently from common-rail troubleshooting. After any pump rebuild or fuel-side service, air can get trapped in the system, and the engine may start and then feel like it is losing prime or sucking air. The usual fix is a purge cycle: run it, cycle the throttle, shut down, let it sit, then restart, before condemning the pump. AFC (air-fuel control) problems, such as a restricted or leaking signal line, a bad bellows, or a plugged vent, show up as excessive smoke or flat power under acceleration and get chased as pump failures when the AFC circuit is the real culprit. Idle speed and governor adjustment points differ by governor type, so confirm which governor is fitted before adjusting anything. Because governor and AFC settings affect speed control and smoke, have your dealer or a qualified Cummins-familiar shop verify any adjustment beyond a small trim range.

Does this engine have onboard electronics or fault codes like a modern diesel?

No. This is a pre-electronic PT-fuel platform with a mechanical governor: no ECM and no fault-code readout. The only electrical items are the charging and starting circuit and, where fitted, a magnetic pickup reading a target near the flywheel or harmonic balancer for tachometer and governor speed reference. Reported electrical problems on this engine family are almost always a fouled or misgapped pickup, a wiring or ground issue, or a tired starter or alternator, not a sensor failure needing a scan tool. A wandering or hunting governor reading is worth checking at the pickup gap and wiring before assuming a governor rebuild is needed. Because incorrect governor and speed-reference behavior can affect overspeed protection, have your dealer verify pickup gap and governor operation rather than adjusting on assumption.

What should a buyer check before purchasing a used VT-1710-1?

Pull an oil sample for lab analysis (fuel dilution, coolant intrusion, wear metals) rather than relying on the hour meter alone; these engines are long-lived when maintained, but prior neglect varies widely unit to unit. Check the coolant's additive history and test-strip records to rule out liner cavitation already in progress. Look for oil in the coolant or coolant in the oil, either of which points to liner seal or head gasket trouble. Check compression and blow-by, verify the PT pump and injectors are not weeping fuel, confirm the gear pump primes cleanly, and check turbo shaft play. Watch smoke color through idle and load transitions: blue signals oil, black points to fuel delivery or AFC mis-adjustment, and persistent white under load (beyond a normal cold start) suggests coolant or unburned fuel. Confirm the rating plate reads VT-1710-1 (turbo, no aftercooler) and not a VTA variant, since ratings and parts diverge. Have your dealer or a qualified engine shop run a compression and leak-down check plus a full oil and coolant analysis before you commit to a purchase.

What generational or series differences matter most for parts and ratings?

The main split in this family is VT (turbocharged, no aftercooler) versus VTA (turbocharged and aftercooled). Aftercooled variants support meaningfully higher continuous power ratings and were the common choice for higher-output marine and industrial duty; the plain VT is set up for a lower continuous power band without the added charge-air cooling hardware. Komatsu's parts catalog treats VT-1710-1 and VTA-1710-1D as distinct engines with different cylinder heads and fuel pump variants, not interchangeable subassemblies. Generic 'VT1710' specs found online often blend ratings spanning several decades of production, from naturally aspirated through aftercooled, several hundred horsepower apart, so always confirm the exact suffix and rating plate on the engine in front of you before ordering parts or expecting a particular horsepower figure.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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