CATHydraulic Parts

4s8902 — Caterpillar Valve Seat Insert Exhaust (.005" Oversize) 4S8902

This is a Caterpillar exhaust valve seat insert, specifically designed for an oversized fit to restore compression in worn engine cylinders. Manufactured to meet stringent OEM quality standards, it provides a durable sealing surface superior to a damaged or standard-sized seat. Operators may notice a rough idle, loss of engine power, or increased exhaust smoke when an exhaust valve seat begins to fail.

Caterpillar Valve Seat Insert Exhaust (.005
Part Specifications
BrandCAT
CategoryHydraulic 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

Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeValve Seat Insert (Exhaust, Oversize)
MaterialHigh-temperature alloy steel
ApplicationEngine cylinder head (exhaust)
Service LifeReplace as needed during engine overhaul
CompatibilityOEM specification (.005" Oversize)
ConditionNew — OEM specification aftermarket

Failure Symptoms

An initial symptom of a failing valve seat is a noticeable drop in engine performance and an increase in exhaust emissions. If left unaddressed, the valve may not seal properly, leading to further cylinder head damage and potential blow-by issues. The ultimate consequence is a significant loss of compression, rendering the engine inoperable.

Installation Tip

Ensure the cylinder head is properly cleaned and free of any residual material from the old seat. Avoid hammering the insert into place; use a proper press or installation tool for correct seating.

Service Note

Inspect all valves, valve guides, and the cylinder head deck for wear or damage when replacing valve seat inserts.