3.
Clean valve guides.
CAUTION
To prevent possible gouging of the cylinder head
surfaces, use care when removing gasket mate-
rial.
4.
Remove all gasket material from surfaces of
cylinder head.
5.
Inspect cylinder head for following defects:
• Damage to gasket surfaces
• Damage to threaded bolt holes
• Burnt or eroded areas in combustion
chamber
• Cracks in exhaust ports and combustion
chambers
• External cracks in water chamber
• Restrictions in intake or exhaust pas-
sages
• Restrictions in cooling system passages
• Rusted, damaged, or leaking core plugs
6.
Measure cylinder head for warpage with a
straight edge and feeler gauge. See Figure 6.
• A cylinder head block deck with warpage
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 mount-
ing surface with a warpage 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 mount-
ing surface with a warpage in excess of
0.10 mm (0.004 in.) within a
152.4 mm (6.0 in.) area must be repaired
or replaced.
Figure 6. Cylinder Head Warpage Inspection
7.
Inspect valves for:
• Burnt or damaged areas
• Undersized margin
• Bent stem
• Scoring or other damage to stem
• Worn key groove
• Worn stem tip
See Figure 7.
0600 SRM 1251 Cylinder Head Repair
5
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