Engine Overhaul Manual v8 4.0 4.6
ENGINE
6
OVERHAUL
Cylinder head - inspection
1. Clean all traces of gasket material from
cylinder head using a plastic scraper.
2. Check core plugs for signs of leakage and
corrosion, replace as necessary. Apply sealant,
Part number STC 50552 to threads of threaded
core plugs.
3. Check gasket face of each cylinder head for
warping, across centre and from corner to
corner.
Maximum warp = 0.05 mm (0.002 in)
4. Check cylinder head height at each end of
cylinder head:
A= 22.94 mm (0.903 in) - New
B= 62.56 mm (2.463 in) - New
5. Cylinder heads may be refaced:
Reface limit = 0.50 mm (0.02 in) from new
dimension