CATBearing & Bushing

1N4320 Main Bearing — Cat Engine: D353

This is a main bearing designed to support the crankshaft within the engine block, reducing friction and wear. It is manufactured to precise tolerances and material specifications to ensure proper oil film formation and load-bearing capacity. Symptoms of worn main bearings include a deep knocking sound from the engine, especially under load, and potential loss of oil pressure.

Main Bearing – Part No 1N4320 – 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-backed babbitt
ApplicationEngine crankshaft support
Service LifeReplace during engine overhaul
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing main bearing will often produce a deep, rhythmic knocking sound from the engine that intensifies with increased RPM or load. If left unaddressed, this can lead to excessive crankshaft wear and potential seizure. Continued operation risks catastrophic engine damage due to crankshaft failure.

Installation Tip

Thoroughly clean the crankshaft journals and bearing bores before installation to prevent contamination. Do not reuse old bearing caps or mix bearings between positions, as they are precision-matched.

Service Note

Inspect crankshaft journals for wear and measure bearing clearances when replacing main bearings.