CATBearing & Bushing

3178766 Main Bearing — Cat 365C

This is a main bearing designed to support the crankshaft within the engine, crucial for maintaining proper crankshaft alignment and reducing friction during combustion cycles. Manufactured to meet rigorous Caterpillar standards, it provides superior wear resistance and load-bearing capacity over a worn or damaged bearing. Operators may notice a drop in oil pressure, increased engine noise, or a general loss of engine power as indicators of main bearing failure.

Main Bearing – Part No 3178766 – 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
MaterialTri-metal (Steel-backed, intermediate alloy, overlay)
ApplicationEngine Crankshaft Main Journal
Service LifeReplace during engine overhaul or as needed
CompatibilityCAT specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial symptoms of main bearing failure often include a persistent knocking or rumbling noise from the engine, especially under load, and a noticeable decrease in oil pressure. If left unaddressed, the bearing will continue to wear, potentially leading to crankshaft damage and severe engine malfunction. Continued operation risks catastrophic engine damage requiring a complete rebuild.

Installation Tip

Ensure crankshaft journals and bearing surfaces are perfectly clean and free of any abrasive material before installation. Never reuse old bearing bolts; always use new, correctly torqued bolts to secure the bearing caps.

Service Note

When replacing main bearings, it is essential to inspect the crankshaft for straightness, wear, and surface finish, and to check connecting rod bearings for wear.