CATEngine Parts

8N0931 Piston Body — Cat Engine: D346 D348

This Piston Body is a fundamental component of the internal combustion engine, forming the movable base within the cylinder that compresses the air-fuel mixture and transmits power to the crankshaft. Manufactured from high-strength cast iron or aluminum alloy, it offers superior durability and heat resistance compared to worn or damaged pistons. Observable symptoms of a failing piston body include excessive engine noise (knocking), blue smoke from the exhaust, and a significant loss of engine power.

Piston Body – Part No 8N0931 – 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 Body
MaterialCast Iron
ApplicationEngine Cylinder
Service LifeReplace as part of engine overhaul
CompatibilityOEM specification
ConditionNew — CTP aftermarket replacement

Failure Symptoms

A worn piston body can manifest as increased oil consumption and audible knocking sounds from the engine. If left unaddressed, this can lead to reduced compression, power loss, and potential damage to the cylinder walls and crankshaft. The ultimate risk is engine seizure due to excessive heat and friction.

Installation Tip

Ensure the cylinder bore is perfectly clean and free of any debris before installing the new piston body to prevent scoring. Verify the correct piston orientation relative to the crankshaft and connecting rod before assembly.

Service Note

When replacing piston bodies, it is essential to also inspect and potentially replace piston rings, cylinder liners, and connecting rod bearings.