CATBearing & Bushing

8N8972-030 Main Bearing — Cat INDUSTRIAL Engine: 3208

This is a main bearing designed to support the engine crankshaft within the engine block, facilitating smooth rotation and reducing friction. Manufactured to precise specifications, it offers superior wear resistance and load-carrying capacity compared to a worn bearing that may show signs of pitting or excessive clearance. Operators might observe a persistent knocking sound from the engine's lower end or a noticeable drop in oil pressure when this bearing fails.

Main Bearing – Part No 8N8972-030 – 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 alloy
ApplicationEngine crankshaft main journal
Service LifeReplace during engine overhaul or based on inspection
CompatibilityOEM specification
ConditionNew — CTP aftermarket replacement

Failure Symptoms

The first indication of a failing main bearing is often a deep, rhythmic knocking sound originating from the lower part of the engine, which may intensify with engine speed. If ignored, the bearing can disintegrate, leading to severe crankshaft and block damage and a significant loss of oil pressure. Continued operation risks catastrophic internal engine failure.

Installation Tip

Thoroughly clean the crankshaft journals and the main bearing bores in the engine block before installation. Never reuse old main bearing bolts; always use new ones and torque them to specification.

Service Note

Inspect the crankshaft for any signs of scoring, wear, or out-of-roundness on the main journals, and check the engine block for any cracks or damage.