6136-31-1010 crankshaft for S6D105 engine

6136-31-1010 6136-31-1110 Crankshaft for Komatsu S6D105 Engine

Name: 6136-31-1010 6136-31-1110 Crankshaft for Komatsu S6D105 Engine
Brand: Topvelsun
SKU: 6136-31-1010
Availability: InStock

Part Number: 6136-31-1010 / 6136-31-1110

MOQ: 1 Piece

Warranty: 6 Months

Lead Time: 7 - 15 Days

Product Type: Crankshaft / Engine Core Part

Engine Reference: S6D105

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Product Description

6136-31-1010 / 6136-31-1110 Crankshaft Verification Notes

This page should be handled as an engine-based crankshaft inquiry rather than a simple machine-model inquiry. For older Komatsu equipment, engine assemblies may have been rebuilt, replaced or swapped during previous service, so the current engine plate and old crankshaft details are more reliable than a general “For Komatsu” description.

Before ordering, the buyer should confirm whether the engine installed on the machine is still the original configuration. If the engine has been rebuilt or exchanged, the machine model alone may lead to an incorrect crankshaft selection.

Why Engine History Matters

Engine replacement risk: older machines may have received replacement engines during major overhaul or second-hand resale.

Serial range difference: similar engine names can still have different crankshaft versions depending on production range and engine arrangement.

Old part confirmation: the old crankshaft marking or parts-book number should be checked before final quotation.

Measurement confirmation: journal size and end-structure photos are needed when the old machine history is unclear.

Confirmation Data Needed

Engine plate photo: send the exact engine model and serial number from the installed engine.

Old crankshaft photo: send clear photos of any visible stamped, cast or labeled markings.

Main and rod journal measurements: confirm whether the old crankshaft is standard size or has been reground.

Gear-end view: provide a clear photo of the timing gear side, keyway and oil-passage area.

Flywheel-end view: provide a clear photo of the rear flange, bolt pattern and flywheel mounting side.

Rebuild Scenarios That Need Extra Checking

Second-hand machine purchase: check whether the engine has been changed before the current owner acquired the machine.

Previous crankshaft grinding: if the old crankshaft was reground, bearing size and journal condition must be checked together.

Oil starvation failure: low oil pressure, blocked oil passages or damaged oil pump can quickly damage a replacement crankshaft.

Bearing seizure: inspect the main bearings, connecting rod bearings, thrust bearings and connecting rods before rebuilding the engine.

Installation Checkpoints

Clean the crankcase, oil passages, bearing seats and oil pan before assembly.

Check crankshaft end play, bearing clearance and connecting rod alignment according to the correct service manual.

Replace or inspect the related bearing set instead of installing a new crankshaft with worn bearings.

After first start-up, confirm oil pressure, idle stability and abnormal noise before returning the machine to heavy-duty operation.

Ordering Information

For accurate confirmation, please send the engine plate, machine plate, old crankshaft marking, journal measurements, gear-end photo and flywheel-end photo. If the machine has been rebuilt or the engine has been replaced, please also provide any available overhaul records.

FAQ

Can this crankshaft be confirmed by “For Komatsu” only?

No. A general “For Komatsu” description is not enough for crankshaft selection. The installed engine plate, old crankshaft marking, journal size and end-structure photos should be checked before ordering.

What if the machine has had an engine replacement?

If the engine was replaced during previous service, the original machine model may not match the currently installed engine. In that case, confirm by engine plate, old crankshaft marking and measurements.

Why are journal measurements needed?

Journal measurements help confirm whether the old crankshaft is standard size or has been reground. They also help check bearing selection during engine rebuild.

Should the oil system be checked during replacement?

Yes. Oil pump condition, oil pickup tube, oil filter, oil passages and bearing condition should be checked before installing a replacement crankshaft.