CATBearing & Bushing

8N5349 Main Bearing — Cat Engine: D343 G343

This is a main bearing designed to provide a low-friction surface for the crankshaft within the engine block. Manufactured to meet strict OEM quality standards, it ensures optimal engine performance and longevity, unlike a worn bearing which can lead to increased friction and oil consumption. Operators may observe a drop in oil pressure, knocking sounds from the engine, or increased exhaust smoke when this bearing fails.

Main Bearing – Part No 8N5349 – 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-backed Babbitt
ApplicationEngine Crankshaft Main Journal
Service LifeReplace during engine overhaul or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing main bearing may first present as a persistent knocking sound from the engine, especially under load. If ignored, this can escalate to significant loss of oil pressure and potential crankshaft damage. The ultimate consequence is engine seizure, rendering the equipment inoperable.

Installation Tip

Ensure the crankshaft journals and bearing bores are perfectly clean and free of any debris before installation. Never reuse old bearing shells, even if they appear to be in good condition.

Service Note

Inspect the connecting rod bearings and crankshaft for any signs of scoring or wear when replacing main bearings.