Discovery I (LJ) V8-4.0L (1996)
Valve Seat: Removal and Replacement
Replacement
NOTE: Service valve seat inserts are available 0.25 mm oversize on outside diameter to ensure interference-fit.
1. Remove worn valve seats.
CAUTION: Take care not to damage counterbore in cylinder head.
2. Heat cylinder head evenly to approximately 120°C.
WARNING: Handle hot cylinder head with care.
3. Using a suitable mandrel, press new insert fully into counterbore.
4. Allow cylinder head to air cool.