CATBearing & Bushing

1512939 Main Bearing — Cat 12H 12M 2

This is a CAT Main Bearing, crucial for supporting the crankshaft within the engine block and maintaining proper oil clearance. It is built to meet rigorous OEM specifications, offering superior wear resistance and load-bearing capacity over a compromised, worn bearing. Operators might observe a drop in oil pressure, increased engine noise, or a knocking sound when this bearing is failing.

Main Bearing – Part No 1512939 – 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 TypeMain Bearing
MaterialSteel alloy with overlay
ApplicationEngine crankshaft support
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, or a noticeable drop in oil pressure. Continued operation can lead to severe crankshaft and block damage, potentially causing engine seizure. This necessitates a complete engine rebuild or replacement.

Installation Tip

Ensure all crankshaft journals and bearing surfaces are meticulously cleaned and free of any debris before installation. Never reuse old bearing bolts; always use new ones torqued to specification.

Service Note

Inspect the crankshaft journals for wear or scoring, and check the connecting rod bearings for signs of damage or wear.