top center). Loosen and move the stationary contact
to correct the gap at full point separation. Secure
points and check for correct gap (Figure 35).
Ignition points should break contact just when the 22
degree timing mark aligns with the flywheel timing
mark. Final timing is corrected by shifting the breaker
box on its mounting-base and using a timing light.
For NH engines with optional VacuFlo cooling, the timing plate,
located just above the oil filter, can be seen by removing the dot
button plug.
Replace burned or faulty points. If only slightly
burned,
dress smooth with a file or fine stone.
Measure the gap with a thickness gauge. Be sure to
wipe the gauge before measuring to remove any
accumulated oil or foreign material that could stick to
the breaker points and cause ignition failure. Set the
point gap at .020".
REFER TO INSTRUCTIONS
FO_R PROPER SETTING OF
THE OIL PRESSURE RELIEF
VALVE ADJUSTMENT SCREW
FIGURE 37. OIL PRESSURE RELIEF VALVE ADJUSTMENT
TAPPET
ADJUSTMENT
The engine has adjustable tappets. To make a valve
adjustment, first remove the valve cover. Crank the
engine slowly by hand until the left intake valve (when
facing the flywheel) opens and closes. Continue
about 1/4 turn until the mark on the flywheel and the
TC mark on the gear cover are in line. This should
place the left piston in the necessary position to
obtain correct valve adjustment.
Correct valve clearances are .003" for intake and
.010"
for exhaust. For each valve, the gauge should
just pass between the valve stem and the valve tappet
(Figure 36). To correct the valve clearance, turn the
adjusting screw as needed to obtain the right
clearance. The screw is self-locking.
INTAKE AND EXHAUST VALVES
(SEE TEXT)
NOTE:
USE A STANDARD AUTOMOTIVE-
TYPE WRENCH TO ADJUST THE
TAPPETS.
NOTE:
SEE VALVE TAPPET
CLEARANCES IN TEXT.
VALVE SEAT
INSERT *
m
VALVE
VALVE ADJUSTING
SCREW
FIGURE 36. TAPPET ADJUSTMENT
25
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