Detroit Diesel — Install Exhaust Valve Seat Insert
Repair & overhaul · Exhaust Valves
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- To prevent possible personal injury wear adequate eye protection and do not exceed 40 psi (276 kPa) air pressure.
Procedure
- Wash the cylinder head with clean fuel oil and dry it with compressed air.
- Clean the insert counterbores and valve inserts with 1,1,1-trichloroethane and dry with compressed air.
- Check the counterbores for cleanliness, concentricity, flatness and cracks.
- Immerse the cylinder head in water heated to 180-200°F (82-93°C) for at least 30 minutes; cool the valve inserts (use dry ice if available).
- Rest the head bottom-up and locate the valve insert squarely in the counterbore, seating face up.
- Drive the valve insert with installer J 22711 until it seats solidly.
- Grind the valve seat insert and check it for concentricity.
Tools required
- Installer J 22711 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Counterbore diameter 1.8965"-1.8975" and depth .401"-.406"
- Inserts installed with a press fit of .0005"-.0025"
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.