CATEngine Parts

1138433 Seal Group Crankshaft — Cat 3508 3512

This is a high-quality crankshaft seal group designed to prevent oil leakage from the rear of the engine where the crankshaft exits. It is manufactured to meet stringent sealing performance standards, ensuring it effectively contains lubricating oil under high pressure and temperature conditions, unlike a worn or damaged seal. Symptoms of a failing seal include visible oil leaks around the crankshaft rear main bearing area and a potential drop in oil level.

Seal Group Crankshaft – Part No 1138433 – 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 TypeCrankshaft Seal Group
MaterialHigh-performance synthetic rubber and metal
ApplicationEngine rear main seal
Service LifeReplace as needed, typically during engine rebuilds or when leaks are detected
CompatibilityCAT 3508, 3512, 3516, 3508B, 3512B
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing crankshaft seal is typically an oil stain or drip visible at the rear of the engine, near the flywheel. If left unaddressed, the leak will likely worsen, leading to significant oil loss and potential damage to the clutch or transmission components from oil contamination. Persistent oil leaks can also lead to low oil pressure, risking internal engine damage.

Installation Tip

Carefully inspect the crankshaft sealing surface for any nicks or imperfections before installing the new seal. Ensure the seal is installed perfectly square to prevent premature wear and leakage.

Service Note

Inspect the crankshaft for wear or damage on the sealing surface and clean the crankshaft counterweight thoroughly before installing the new seal.