CATBearing & Bushing

4543931 Main Bearing Kit — Cat 120M 120M 2

This is a main bearing kit, essential for reducing friction and wear between the crankshaft and the connecting rods within the engine. Manufactured to precise tolerances, these bearings ensure smooth rotation and optimal engine performance, unlike worn bearings which can be scored or have excessive clearance. Operators may experience a knocking sound from the engine, a drop in oil pressure, or a general loss of engine power when main bearings fail.

Main Bearing Kit – Part No 4543931 – 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 Kit
MaterialBabbitt alloy on steel backing
ApplicationEngine crankshaft support
Service LifeReplace every engine overhaul or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of main bearing failure is often a distinct knocking or rattling sound originating from the engine's lower end. Continued operation will lead to a significant drop in oil pressure and a noticeable decrease in engine performance. If left unaddressed, this can result in severe crankshaft and engine block damage.

Installation Tip

Always use new crankshaft bolts and torque them in the specified sequence to ensure even clamping force. Never reuse old main bearing caps or attempt to install bearings without proper lubrication.

Service Note

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