CATBearing & Bushing

4F1727 Main Bearing (Rear) — Cat INDUSTRIAL Engine: D315

This is the rear main bearing for specific Caterpillar industrial engines, crucial for supporting the crankshaft's rotation and absorbing significant operational forces. It is manufactured to meet rigorous quality standards, providing reliable performance and longevity compared to a worn bearing that can lead to crankshaft damage. Operators may experience engine knocking sounds, loss of oil pressure, or visible smoke from the exhaust if this bearing begins to fail.

Main Bearing (Rear) – Part No 4F1727 – 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 TypeMain Bearing (Rear)
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 indications of a failing rear main bearing include a deep knocking sound from the engine, particularly under load, and a potential drop in oil pressure. If not addressed, the knocking will become more severe, and the crankshaft can sustain significant damage, leading to complete engine failure. This can result in costly repairs and extended downtime.

Installation Tip

Ensure the crankshaft journal and the bearing surface are perfectly clean and free from any abrasive particles before installation. Never reuse old bearing bolts; always use new, correctly torqued fasteners to secure the bearing caps.

Service Note

Inspect the crankshaft journals for scoring or out-of-roundness, and check the connecting rod bearings for wear.