CATEngine Parts

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

This main bearing (thrust) is a critical component in the engine's rotating assembly, controlling axial movement of the crankshaft and ensuring proper alignment. Manufactured to precise tolerances, it provides essential support and reduces friction, unlike a worn bearing which can lead to excessive crankshaft play. Symptoms of failure include a knocking sound from the engine, low oil pressure, or a noticeable increase in crankshaft end play.

Main Bearing (Thrust) – Part No 4W8091 – 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)
MaterialSteel alloy with bearing material
ApplicationEngine crankshaft support
Service LifeReplace during engine overhaul or if worn
CompatibilityOEM specification
ConditionNew — CTP aftermarket replacement

Failure Symptoms

Early signs of a failing thrust bearing may include a faint knocking noise that increases with engine RPM. If ignored, this can progress to a loud knocking sound, severe crankshaft movement, and potential oil pressure loss. Continued operation risks catastrophic engine damage due to crankshaft dislocation.

Installation Tip

Ensure the crankshaft journals and bearing surfaces are perfectly clean and free of any debris. Lubricate the bearing surfaces generously with clean engine oil before installation.

Service Note

Inspect the crankshaft for any scoring or wear on the thrust surfaces, and check all other main and connecting rod bearings for wear.