9-5
CYLINDER HEADS AND VALVES
The cylinder heads are removeable after the intake
and exhaust manifolds have been removed. See
Page 8-1, 8-8 or 8-13 regarding removal of the in-
take manifold. See Page 7-6 regarding removal of
the exhaust manifold.
Removal and Disassembly
To remove the heads from the crankcase, and
valves from the heads:
1. Remove the valve covers for access to two of
the four head bolts. Have rags in place to catch
the oil that spills out.
2. Remove the four head bolts and pull away the
head.
3. If the valves are to be removed, place the head
on a flat surface and push down on the valve
spring retainers, remove the collets and disas-
semble.
4. Clean the parts thoroughly. Check head flat-
ness, spring free length, valve seat angle and
contact width, valve stem diameter and valve
guide I. D. against DIMENSIONS AND CLEAR-
ANCES (Page 9-15) and replace parts as nec-
essary. Replace burned, pitted or bent valves.
Reassembly and Installation
Reassembly and installation are the reverse of dis-
assembly and removal. Note the following:
1. Lap each valve in place until a uniform ring
shows around the face of the valve.
2. Apply oil to the valve stems and install new
valve stem seals.
3. Check the head dowel pins and replace if nec-
essary.
4. Install new head gaskets and torque the head
bolts in three steps as follows:
Tightening Torques
Step 1 Step 2 Step 3
7.2 lb-ft
(9.8 N-m)
14.5 lb-ft
(19.6 N-m)
24.6-30.4 lb-ft
(33.3-41.2 N-m)
5. Assemble the push rods and rocker arms
(Page 9-6) and adjust valve lash (Page 9-4).
RETAINER
COLLET
SPRING
EXHAUST
VALVE
STEM SEAL
(BROWN)
INTAKE
VALVE
STEM SEAL
(BLACK)
EXHAUST
VALVE
INTAKE
VALVE
FIGURE 9-3. CYLINDER HEAD AND VALVES
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