Discovery II (LT) V8-4.6L (2003)
5. Renew valves and guides as necessary.
Valve Head Diameter A:
Inlet: 39.75 to 40.00 mm
Exhaust: 34.226 to 34.48 mm
Valve Stem Diameter B:
Inlet: 8.664 to 8.679 mm
Exhaust: 8.651 to 8.666 mm
6. Check installed height of each valve.
Valve Installed Height C: 47.63 mm
7. Renew valve/valve seat insert as necessary.
8. Check valve stem to guide clearance.
Valve stem to guide clearance D:
Inlet: 0.25 to 0.66 mm
Exhaust: 0.38 to 0.78 mm
9. Check condition of valve springs:
Free Length: 48.30 mm
Fitted Length: 40.40 mm
Load-Valve Closed: 339 ± 10 N
Load-Valve Open: 736 ± 22 N
NOTE: Valve springs must be replaced as a complete set.