Komatsu SAA6D140E-7

The register lists 35 variants here rated from 43 to 2,610 kW at 1,600 to 2,600 rpm, three- to eighteen-cylinder engines (26 inline, 9 V-configuration) with a bore of 95 to 170 mm and a stroke of 115 to 190 mm. Maximum torque ranges from 210 to 14,077 Nm at 1,100 to 1,800 rpm. Tier 4 (Final or Phase-in) forms the majority with 24 variants ahead of Interim Tier 4 with 10 and Tier 2 with one; the 130–560 kW power category is the most common with 12 variants, followed by above 560 kW with 7 and 75–130 kW with 6.

SAA engines power Komatsu's own excavators, wheel loaders and bulldozers, while the QSK large engines, rated up to 2,610 kW, drive the biggest haul trucks and mining equipment; this collective page thus spans the full range from compact construction machinery engines to large mining engines, with which Komatsu competes against Caterpillar, Liebherr and Hitachi.

When buying used, SAA engines call for a check of common-rail system and turbocharger tightness and the condition of the charge air cooler, while the large QSK engines additionally need the service history of injection pumps and cylinder liners checked; oil consumption, coolant level and, on variable-geometry turbochargers, their response behaviour also matter. Spare parts run through the Komatsu or Cummins dealer network.