740 L4-2320cc 2.3L DOHC B234F (Can) (1992)
Valve Seat: Service and Repair
REPLACEMENT OF VALVE SEATS
Important Valve guide must always be replaced before replacing seat.
Clean valve seat
Ensure that edge of seat is clearly visible.
Remove valve seat
Use seat miller such as Mira P/N 998 6045-5.
Set milling cutter
Adjust cutter diameter to slightly less than standard diameter of seat recess in cylinder head.
Seat recess diameter
Intake:
35.85-35.90 mm (1.4124-1.4144 in)
Exhaust:
32.85-32.90 mm (1.2933-1.2953 in)
Mill out valve seat
Blow clean with compressed air and inspect work continuously.
Remove remains of seat.
Seat will become loose just before max. milling depth is reached.