3-33
3
Cleaning and Inspecting Cylinder
Head/Valves
1. Thoroughly clean the cylinder head in a non-caus-
tic solvent; then dry with compressed air.
2. Using a high-quality straight edge and feeler
gauges, check the head for warpage; then holding
the straight edge against the head, measure any
warpage with the feeler gauge. Check cor-
ner-to-corner, side-to-side, and end-to-end.
DE302
NOTE: If cylinder head warpage is present, the
cylinder head must be planed by a qualified
machine shop. Pre-combustion chambers must be
removed to plane the head.
3. Inspect the valve springs for surface cracks and
fractures.
4. Using a calipers, measure the free-length of the
valve springs. The measurement must be equal to
or greater than minimum specifications.
DE318
5. Check that the spring ends are parallel. A caliper
may be used to check parallelism of spring ends.
DE318A
6. Clean valve faces, valve seats, and valve stems.
DO NOT use a wire brush on valve stems.
7. Using a suitable calipers or outside micrometer,
measure the valve stem. If valve stem measures
less than minimum specifications, the valve must
be replaced.
DE319
8. Measure the valve guide inside diameter using a
suitable micrometer or bore gauge. If measure-
ment is greater than specified, the valve guide
must be replaced.
9. Check the valve seats for evidence of discolor-
ation, cracks, or loose fit in cylinder head as well
as clean, even contact area. Replace any valve
seats that show evidence of excessive wear or
damage.
10. Check the cylinder head for cracks, loose rocker
arm studs, or loose injector hold-down studs. If
cylinder head is cracked, it must be replaced.
! WARNING
Always wear safety glasses when working with com-
pressed air.
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