CATBearing & Bushing

1S7578 Main Bearing (Rear) — Cat Engine: D342

This is a rear main bearing, a critical component of the engine's crankshaft assembly, designed to reduce friction and support the rotating shaft. It is manufactured to meet stringent OEM quality standards, ensuring superior durability and performance compared to a worn bearing that exhibits scoring or excessive clearance. Operators may notice a knocking sound from the engine, a decrease in oil pressure, or rough running if this bearing fails.

Main Bearing (Rear) – Part No 1S7578 – 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 or aluminum alloy
ApplicationEngine crankshaft main journal
Service LifeReplace based on engine overhaul schedule or failure
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of failure may include a persistent knocking sound from the engine, particularly under load. If left unaddressed, the bearing clearance will increase, leading to reduced oil pressure and potential engine overheating. Continued operation risks severe crankshaft and block damage.

Installation Tip

Ensure the crankshaft journals are meticulously cleaned and inspected for any imperfections before installation. Avoid using abrasive materials that could scratch the bearing surface during handling.

Service Note

Inspect the crankshaft journals for scoring and ensure proper oil clearance is achieved during installation.