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Home›Repair guides›Inlet and Exhaust Valve Seat Inserts - Remove and Install

Caterpillar — Inlet and Exhaust Valve Seat Inserts - Remove and Install

A Caterpillar service procedure — check it applies to your exact model before use.

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Before you start

  • Keep all parts clean from contaminants.
  • Do not machine the prefinished valve seat inserts in order to correct the valve projection. Excessive valve projection indicates that the valve seat insert is not seated or material was not cleaned from the bottom of the counterbore.

Procedure

  1. Start By: Remove the inlet and exhaust valves.
  2. Removal: Use Tooling (Valve Seat Extractor) to remove the valve seat inserts from the cylinder head.
  3. Removal: Clean the bores in the cylinder head for the valve seat inserts. Remove any rough areas from the bores.
  4. Installation: Lower the temperature of new valve seat inserts (1).
  5. Installation: Use Tooling (Valve Seat Driver) to install the new valve seat inserts in the cylinder head.
  6. End By: Install the inlet and exhaust valves.

Tools required

  • Valve Seat Extractor Tool Group 466-7441
  • Valve Seat Driver (Inlet) 9U-6897
  • Valve Seat Driver (Exhaust) 9U-6898

Source: manual:3456 Disassembly and Assembly.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.