CATEngine Parts

387-9840 Crankshaft — Cat 259D 279D

This crankshaft is the central rotating component of the engine, converting linear piston motion into rotational force to power the equipment. It is precision-machined from high-strength forged steel to meet stringent OEM standards, ensuring superior durability and performance compared to worn or damaged crankshafts. Operators may notice a significant loss of engine power, rough idling, or unusual knocking sounds from the engine block if the crankshaft is failing.

Crankshaft – Part No 387-9840 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeCrankshaft
MaterialForged Steel
ApplicationEngine Rotating Assembly
Service LifeReplace based on inspection or failure
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of crankshaft failure may include a persistent knocking sound from the engine or a noticeable decrease in engine power. If ignored, the issue can progress to severe engine vibration and potential bearing seizure. Continued operation risks significant internal engine damage, leading to costly repairs.

Installation Tip

Ensure the crankshaft journals are meticulously cleaned and free of any debris before installation. Avoid overtightening the main bearing cap bolts, as this can distort the crankshaft and lead to premature failure.

Service Note

Always inspect and replace engine bearings (main and connecting rod) when servicing or replacing the crankshaft.