3.20
ENGINE
CYLINDER HEAD WARP INSPECTION
1. Lay a straight edge across the surface of the head at
several different points and measure warpage by
inserting a feeler gauge between the straight edge
and the cylinder head surface. If warpage exceeds the
service limit, replace the cylinder head.
COMBUSTION CHAMBER INSPECTION
Clean all accumulated carbon deposits from combustion
chamber and valve seat area with a soft wire brush.
Inspect the combustion chamber for cracks and/or
damage from foreign debris.
CYLINDER HEAD DISASSEMBLY
NOTE: Keep all parts in order with respect to their
location in the cylinder head.
1. Using a valve spring compressor, compress the valve
springs and remove the split keeper. NOTE: To
prevent loss of tension, do not compress the valve
spring more than necessary.
2. Remove spring retainer and spring.
NOTE: The valve springs should be positioned with the
tightly wound coils (A) against the cylinder head.
3. Push valve out, keeping it in order for reassembly in
the same guide.
4. Measure free length of the inner and outer springs
with a Vernier caliper, Ill.1. Check spring for
squareness as shown in Ill.2. Replace spring if
measurements are out of specification.
5. Remove valve seals. NOTE: Replace seals whenever
the cylinder head is disassembled. Hardened,
cracked or worn valve seals will cause excessive oil
consumption and carbon buildup.
Cylinder Head Warp Limit:
.002” (.05 mm)
WARNING
Wear eye protection or a face shield during cylinder
head disassembly and reassembly. Cylinder head
service should be performed by a technician knowl-
edgeable in cylinder head reconditioning in a prop-
erly equipped shop.
Valve Spring
Free Length
III.1
A
III.2
Coil fatigue/
Squareness
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