139
POWERHEAD
CYLINDER HEAD
7
Remove valve spring retainer, valve spring, and
valve.
Remove valve stem seal and valve spring seat.
Remove rocker arm pivot bolts.
Cleaning/Inspection
Cylinder Head
Remove all carbon from combustion chambers.
IMPORTANT: Do not use sharp edged tools to
scrape carbon off cylinder head or components.
Be careful not to scuff or nick metal surfaces.
Inspect intake and exhaust ports, combustion
chambers, head surface, and valve seat.
If cracks or other damage are found, replace cylin-
der head.
Check for cylinder head warpage using a piece of
bar stock or machinist’s straightedge and a feeler
gauge set.
Measure distortion across six locations. Cylinder
head warpage must not exceed 0.002 in. (0.05
1. Cotters
2. Retainer
3. Spring
4. Valve
5. Valve stem seal
6. Valve spring seat
004510
1. Valve stem seal
2. Valve spring seat
005681
1. Pivot bolts 005682
2
1
11
005672
005673
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