Engine — 5.0 & 5.7 Litre
64 VPA 7748089 English 09-2007
• External cracks in the water chambers
• Restrictions in the intake or exhaust passages
• Restrictions in the cooling system passages
• Rusted, damaged or leaking core plugs
Inspect:
6. Measure the cylinder head for warping with a straight edge and
feeler gauge
• A cylinder head block deck with warping in excess of 0.10
mm (0.004 in) within a 152.4 mm (6.0 in) area must be
repaired or replaced.
• A cylinder head exhaust manifold deck with warping in
excess of 0.05 mm (0.002 in) within a 152.4 mm (6.0 in) area
must be repaired or replaced.
• A cylinder head intake manifold deck with warping in excess
of 0.10 mm (0.004 in) within a 152.4 mm (6.0 in) area must
be repaired or replaced.
Valve Spring Tension
1. Use the J 9666 in order to measure the valve spring.
Replace the valve spring if the valve spring tension is less than 338
N (76 lb.) at 43.2 mm (1.70 in).
Valve Spring Straightness
2. Inspect the valve springs for Straightness.
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