CATEngine Parts

3109905 Piston As — Cat 450e AP555E

This piston assembly is a fundamental component of the engine's power generation system, converting the force of combustion into rotational motion via the crankshaft. Manufactured to precise weight and dimensional tolerances, it ensures balanced engine operation and efficient power transfer, unlike a worn piston with scoring or a damaged crown. Operators may experience increased oil consumption, loss of engine power, or knocking sounds from the engine when a piston assembly is failing.

Piston As – Part No 3109905 – 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 or if damaged
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of a failing piston assembly include increased blue smoke from the exhaust and a reduction in engine power. If left unaddressed, oil consumption will worsen, potentially leading to lubrication issues and increased wear on other engine components. Continued operation with a damaged piston can cause cylinder wall damage and impact overall engine integrity.

Installation Tip

Ensure the cylinder bore is clean and properly honed before installing the piston assembly to ensure correct ring seating. Avoid using excessive force when seating the piston rings into the cylinder bore.

Service Note

Inspect cylinder liners, connecting rod bearings, and piston rings for wear when replacing a piston assembly.