CATBearing & Bushing

7N3509 Piston Body — Cat 3406

This is a robust piston body, a core component of an engine's reciprocating assembly, responsible for transferring combustion pressure to the crankshaft via the connecting rod. Manufactured from high-strength materials, it ensures reliable performance and durability under extreme thermal and mechanical stress, unlike a cracked or worn piston body that would lead to compression loss. Operators might notice a significant loss of engine power, increased exhaust smoke, or rough engine running accompanied by unusual noises if this component is compromised.

Piston Body – Part No 7N3509 – CAT Spare Part
Part Specifications
BrandCAT
CategoryBearing & Bushing
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

Never strike bearings directly — use a bearing press or driver set. Heat housing (not bearing) to ease installation. Replace bearings in sets where applicable. Check housing bore diameter before fitting — out-of-round bores destroy new bearings.

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 Aluminum Alloy
ApplicationEngine Cylinder
Service LifeReplace as part of engine overhaul or if damaged
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing piston body typically manifests as a significant reduction in engine power and performance. This can be accompanied by increased exhaust smoke, rough idling, and potentially audible knocking sounds from the affected cylinder. Continued operation can lead to severe engine damage, including cylinder wall scoring and potential crankshaft issues.

Installation Tip

Ensure the cylinder bore is clean and properly honed before installing the new piston body. Avoid overtightening the connecting rod bolts, as this can distort the piston.

Service Note

Always replace the piston rings and inspect the cylinder liner and connecting rod bearings when replacing a piston body.