Tappet Adjustment: The engine is equipped with
adjustable valve tappets. The valve tappet clearance
should be checked and adjusted, if necessary, at least
every 400 operating hours or when poor engine
performance is noticed. Adjust the valve clearance
only when engine is at ambienttemperature. Proceed
as follows:
1.
Remove all parts necessary to gain access to
valve tappets.
2.
Remove spark plugs to make turning the engine
easier.
3. Use the engine flywheel to turn the engine over
slowly by hand until the left hand intake valve
opens and closes. Continue turning the flywheel
until the TC mark is on the top and lined up with
the TC mark on the gearcover. Both valves should
be closed. This should place the left hand piston
at the top of its compression stroke, the positiQn it
must be in to get proper valve adjustment forthe
left cylinder.
4.
Clearances are shown in Figure 52 and Tune-up
Specifications. For each valve, the gauge should
just pass between the valve stem and valve tappet.
5. To correct the valve clearance, turn the adjusting
screw as needed to obtain the right clearance.
The screw is self locking.
6. To adjust valves on the right hand cylinder, turn
engine one complete revolution and again lineup
mark on the flywheel and theTC mark on the gear
cover. Then follow adjustment procedure given
for left hand cylinder.
7. Replace all parts removed. Tighten all screws
securely. Torque manifold bolts.
FLYWHEEL
Use a suitable puller (with clawsorwith bolts to agree
with flywheel) to pull the flywheel.
Do not drop the flywheel. A broken fin will
destroy the balance. Always use a steel key
for mounting the flywheel.
CAUTION
INTAKE VALVE
.003
FIGURE 52. VALVE ADJUSTMENT
If a puller is not available turn the flywheel mounting
screw outward about two turns. Use a screwdriver
behind the flywheel to take up the crankshaft end
play. Then strike a sharp endwise blow on the head of
the cap screw with a heavy soft-faced hammer to
loosen.
GEAR COVER
After removing the flywheel key and mounting
screws, tap the gear cover gently with a soft-faced
hammer to loosen it.
CAUTION
When installing the gear cover, make sure that
the roll pin in the gear cover engages the
metal lined (smooth) hole or plastic bushing in the governor cup,
Figure 53.
The roll pin protrudes upward from the cover and its outer end is 3/4
inch from a straight edge placed across the cover mounting
surface.
GOVERNOR CUP
GOVERNOR CUP
SO THAT ROLL PIN-
FITS INTO THE
METAL LINED
HOLE OR PLASTIC
BUSHING IN THE CUP
^-GOVERNOR ARM
GOVERNOR SHAFT
GOVERNOR
SHAFT YOKE •
(Smooth Side
Towa
rd
Cu p)
OIL SEAL
'GOVERNOR
SHAFT
IF FEELER WILL
ENTER HOLE 1/2'
BALL HAS
FALLEN OUT
FIGURE 53. GEAR COVER ASSEMBLY
36
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