CATEngine Parts

4W8091-040 Main Bearing (Thrust) — Cat 613C PR-1000

This main bearing (thrust) is a crucial element in the engine's crankshaft assembly, controlling axial movement and supporting the crankshaft's rotation. Manufactured to meet exacting OEM standards, it provides superior wear resistance and load-bearing capacity compared to a worn bearing that may exhibit scoring, pitting, or excessive clearance. Operators might notice increased engine noise, particularly knocking sounds, or a drop in oil pressure if this bearing is failing.

Main Bearing (Thrust) – Part No 4W8091-040 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
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

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

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 (Thrust)
MaterialTri-metal alloy
ApplicationEngine Crankshaft Assembly
Service LifeReplace during engine overhaul or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing thrust main bearing is often an audible knocking or rattling noise from the engine, especially under load. As the wear progresses, this noise will become more pronounced, and oil pressure may begin to drop. Continued operation risks severe crankshaft and bearing journal damage.

Installation Tip

Thoroughly clean the crankshaft journals and bearing bores before installing new bearings to ensure proper seating and oil film formation. Never reuse old bearing shells, even if they appear to be in good condition.

Service Note

Inspect the crankshaft journals for scoring or wear, and check the oil pump and oil filter for any debris when replacing main bearings.