CATEngine Parts

4b-8393 Bearing Cup — Cat 3406 C15

This is a main engine bearing cup that supports the crankshaft within the engine block, ensuring smooth rotation and proper oil clearance. It is manufactured to meet stringent OEM standards, providing superior wear resistance compared to a worn or damaged bearing. Symptoms of a failing bearing cup include increased engine noise, particularly knocking sounds, and a potential drop in oil pressure.

Bearing Cup – Part No 4b-8393 – 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 TypeEngine Bearing Cup
MaterialSteel alloy with bearing surface
ApplicationEngine crankshaft main bearing
Service LifeReplace as needed based on inspection
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing bearing cup is often an audible knocking or rattling noise from the engine, especially under load. If ignored, this can lead to increased wear on the crankshaft and bearing journals, potentially causing a loss of oil pressure. Continued operation risks severe engine damage due to improper crankshaft support.

Installation Tip

Ensure the crankshaft and bearing bores are meticulously clean before installation, as even small debris can cause premature wear. Avoid mixing up the upper and lower bearing shells, as they are designed for specific positions.

Service Note

Inspect the crankshaft journals for scoring or wear, and check the oil pump for proper pressure when replacing main bearing cups.