CATHydraulic Parts

4s8915 — Caterpillar Valve Seat Insert Inlet (.010" Oversize) 4S8915

This is an oversized inlet valve seat insert designed for specific Caterpillar engine applications, ensuring proper valve sealing and combustion efficiency. Manufactured to precise tolerances, it offers superior wear resistance and durability compared to a worn or damaged seat. Operators may experience a noticeable loss of engine power, rough idling, or increased exhaust smoke when this valve seat fails.

Caterpillar Valve Seat Insert Inlet (.010
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 (Oversize)
MaterialHardened steel alloy
ApplicationEngine intake valve
Service LifeReplace as needed during engine overhaul
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A loss of engine compression, indicated by rough idling and reduced power, is a primary symptom of a failing valve seat insert. If left unaddressed, the compromised seal can lead to increased oil consumption and potential valve damage. Continued operation risks significant engine performance degradation and potential internal component damage.

Installation Tip

Properly seat the insert using specialized tooling to ensure it is flush and secure within the cylinder head. Avoid hammering the insert into place, as this can distort the seat or damage the cylinder head.

Service Note

Inspect the corresponding valve and valve guide for wear when replacing the intake valve seat insert.