CATEngine Parts

2977754 Piston As-(Os 0.25Mm) — Cat 311C 312C

This is an oversized (0.25mm) piston assembly, a fundamental component of the engine's combustion chamber responsible for converting fuel energy into mechanical motion. Manufactured to meet stringent aftermarket quality standards, it provides a reliable solution for engines with worn cylinder walls that exhibit reduced compression or oil consumption. Operators may notice a loss of engine power, increased exhaust smoke, or rough engine operation when this piston assembly requires replacement.

Piston As-(Os 0.25Mm) – Part No 2977754 – 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 TypePiston Assembly
MaterialAluminum alloy
ApplicationEngine combustion chamber
Service LifeReplace as part of engine overhaul
CompatibilityCTP aftermarket replacement
ConditionNew — CTP aftermarket replacement

Failure Symptoms

Initial symptoms of a worn piston include a noticeable decrease in engine power and increased blue or white smoke from the exhaust. If the issue progresses, oil consumption will rise, and the engine may begin to run rough or misfire. Failure to address worn pistons can lead to severe cylinder wall damage and potential engine seizure.

Installation Tip

Ensure the cylinder bore is honed and cleaned meticulously before installing the new piston to ensure proper ring seating. Avoid mixing up piston orientation or installing them in the wrong cylinder.

Service Note

Always replace piston rings, cylinder liners, and connecting rod bearings when installing a new piston assembly.