CATBearing & Bushing

8N8973 Main Bearing — Cat Engine: 3208 3208T

This is a CAT Main Bearing designed to support the crankshaft within the engine block, ensuring smooth rotation and proper alignment. It is manufactured to meet stringent OEM quality standards, offering superior wear resistance compared to a worn bearing that can cause excessive crankshaft play. Operators may notice a knocking sound from the engine, a significant drop in oil pressure, or visible smoke due to oil consumption when this bearing fails.

Main Bearing – Part No 8N8973 – 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 support
Service LifeReplace based on engine overhaul schedule
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of main bearing failure include a persistent deep knocking sound from the engine, especially under load. If ignored, this can progress to a significant loss of oil pressure and increased engine vibration. Continued operation risks severe crankshaft and block damage, leading to a complete engine rebuild.

Installation Tip

Ensure the crankshaft journals are meticulously cleaned and free of any debris before installation. Avoid overtightening the bearing caps, as this can distort the bearing shells and compromise lubrication.

Service Note

Inspect the crankshaft for any scoring or wear, and replace the oil pump if its performance is questionable.