CATBearing & Bushing

8N8229 Main Bearing — Cat 3306

This is a CAT Main Bearing, a crucial component within the engine's crankshaft assembly, designed to support the rotating crankshaft and minimize friction. Manufactured to meet stringent OEM standards, it provides superior durability and precise load distribution compared to a worn main bearing which can lead to increased crankshaft wear, oil pressure loss, and knocking sounds. Operators may notice a significant drop in oil pressure, audible knocking from the engine, or rough engine operation when this component fails.

Main Bearing – Part No 8N8229 – 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 TypeEngine Main Bearing
MaterialSteel Alloy with Babbitt
ApplicationEngine Crankshaft
Service LifeReplace during engine overhaul or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The primary symptom of a failing main bearing is a distinct knocking or rumbling sound originating from the engine's lower end, especially under load. If ignored, this can lead to rapid crankshaft and bearing journal wear, causing a significant loss of oil pressure and potential engine seizure. Continued operation risks catastrophic engine damage, requiring a complete rebuild or replacement.

Installation Tip

Ensure the crankshaft journals and bearing bores in the engine block are perfectly clean and free of any burrs or debris before installation. Never reuse old bearing caps or bolts without proper inspection and torque verification.

Service Note

Inspect crankshaft journals for wear or damage, and check oil pump and oil passages for blockages when replacing main bearings.