Service Manual

Figure 4-54
Cylinder Head Assembly
1. Clean the mating surface of the head and
r“ 2. Install the two aligning pins in the head or
3. Install a new head gasket, part number 81-
cylinder block.
block.
3680, and mount the head.
4. Insert the four head bolts and torque to 1.8
-2.8 kg-m (13
20 ft-lb). See Fig. 4-55.
Figure 4-53
Valves
1. Lubricate the valve stems and install the
valves in the head.
2. The valve heads are marked intake and
exhaust. The intake valve is mounted in the
large diameter opening and the exhaust
valve is mounted in the small diameter
opening.
NOTE: It is possible to insert the
valves in the wrong opening but they will not
seal.
3. Install the valve springs and keepers. The
keepers and springs are the same on intake
and exhaust. See Fig. 4-54. Hold the head of
the valve in place and push down with your
thumbs to install the keepers.
Figure 4-55
5. Install the two push rods they are
6. Install the rocker arms they are also
7. Install the adjusting nuts and jam nuts.
8. Move the piston to TDC of the compression
9. Adjust the valve clearance to .02 .1.3 mm
interchangeable.
interchangeable.
stroke
so both valves are closed.
(.001
.005 in.). See Fig. 4-56.
Figure 4-56
10. Tighten the jam nut against the adjusting
nut.
11. Mount a new valve cover gasket and install
the valve cover. The “cut out” on the cover
edge goes toward the spark plug. See Fig.
4-57. A flat washer should be placed on
each screw. Tighten the screws to .4 .7
kg-m (3.0
5.0 ft-lbs).
33