V8 Engine 3.5 3.9 4.2
ENGINE
8
OVERHAUL
Early valves - dimension A = 29.5 to 30.5 mm
(1.16 to 1.20 in)
Later valves - dimension
A = 32.5 to 33.5 mm (1.28 to 1.32 in)
The modified valves may be fitted to early engines in
engine sets provided that the modified valve guides
are also fitted.
Valve guides
NOTE: The modified valve guides fitted to
later engines are 5 mm (0.211 in) shorter
than the early type guides, the overall
length of the modified guide being 57 mm (2.24
in); the reduction in length being the distance
the guide protrudes into the combustion
chamber side of the cylinder head. The modified
guides may be fitted to early engines, both with
and without suffix B to the engine serial number
in engine sets provided that the modified inlet
and carbon break exhaust valves are also fitted.
1. Remove carbon deposits from valve guides
using an 8.70 mm (0.34 in) diameter reamer
inserted from combustion face side of cylinder
head.
2. Clean valve springs, cotters, caps and valves.
Clean inlet valve guide bores. Ensure all loose
particles of carbon are removed on completion.
3. Check existing valve stem to guide clearances,
valve head diameters and fitted height of
valves.