Komatsu 6D95L-1A(S/N 10001-UP)

The Komatsu 6D95L-1A (S/N 10001-UP) is a bare naturally aspirated inline-six diesel engine from Komatsu's 95-series family, roughly 4.89 L displacement with a 95 mm x 115 mm (3.74 in x 4.53 in) bore and stroke, and mechanical direct injection fed by either a Bosch-type in-line PE5 pump or a distributor VE pump, governed mechanically by an RSV governor with no electronic engine controls. Gross output runs approximately 52-61 kW (70-82 hp) at 2,150-2,500 rpm, and the bare engine weighs approximately 420-430 kg (926-948 lb) dry, an engine spec rather than a complete-machine weight since this listing covers the engine assembly only. The 1A / S/N 10001-UP designation marks the original, earliest build of the 6D95L-1 line, ahead of the later 6D95L-1AA (S/N 29222-UP) and 6D95L-1AC (S/N 96999-UP) suffix revisions that followed the same base model. Its best-documented host pairing is the Komatsu PC100-3 (S/N 18001-UP) and PC100L-3 long-undercarriage (S/N 12001-UP) crawler excavators, both dash-3-generation machines dating to the mid-to-late 1980s; this displacement-class engine is also fitted across other Komatsu dash-3-era equipment per parts records, though those pairings are not confirmed for this exact suffix and serial range.

Running changes across the 6D95L-1 suffix line (1A to 1AA to 1AC) track incremental updates to fuel-system calibration, casting revisions, and wear-part specification rather than a ground-up redesign, so the core inline-six, naturally aspirated, mechanical-injection architecture carries through the whole family. That mechanical simplicity, no ECM, no sensors, no aftertreatment, is exactly why this engine still holds value in the used and parts market today: PC100-3 and PC100L-3 class excavators from this era remain in service or are being parted out, and shops favor this engine as a rebuildable or exchange unit precisely because it can be serviced and calibrated with basic mechanical tooling rather than diagnostic software. Parts commonality across the wider 95-series block keeps supply active for liners, pistons, injection components, and gaskets even though the host machines themselves are long out of production, which sustains demand from independent rebuilders and fleets running older dash-3 equipment past its original service life.

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.