Discovery I (LJ) V8-4.0L (1996)
Valve Seat: Overhaul
Valve and Seat Refacing
Valve and Seat Refacing
CAUTION: Renew worn valve guides and seat inserts before refacing valve seats.
1. Check condition of valve seats and valves that are to be re-used.
2. Remove carbon from valves and valve seats.
3. Reface valves as necessary. If a valve has to be ground to a knife-edge to obtain a true seat, install a new valve.
Valve seating face angle A: 45°
4. Cut valve seats using tool No. LRT-12-501 with tool No. LRT-12-503 and tool No. LRT-12-517, or equivalents.
Valve seat:
Width A:
Inlet: 37.03 mm
Exhaust: 31.50 mm
Width B= 1.5 to 2.00 mm
Angles:
C= 70°
D= 46°
E= 20°
5. Ensure cutter blades are correctly installed to cutter head with angled end of blade downwards, facing work, as illustrated. Check that cutter blades