20
VALVE AND IGNITION TIMING.
Piston Measurements
From Top Center
Inlet opens 9 degrees before top center 039”(0.991 mm.)
Inlet closes 50 degrees after bottom center3.772”(95.81 mm.)
Exhaust opens 47 degrees before bottom center. . . .3.799”(96.49 mm.)
Exhaust closes 12 degrees after top center 054” (1.37 mm.)
Ignition Timing5° BTC
Spark set top center with automatic spark controls at rest, when using low octane fuel.
Firing Order1-3-4-2
Tappet setting for valve timing 020” (0.51 mm.)
Number of flywheel teeth124
CHECKING VALVE TIMING.
To check the valve timing, adjust the inlet valve tappet No. 1 cylinder to .020” (0.51 mm.). Use care in making this adjustment
that the measurement is accurate with feeler gauges and that the tappet is resting against the lowest surface of the camshaft
cam. Rotate crankshaft clockwise until piston in No. 1 cylinder is ready for the intake stroke. (The intake valve opens at 9°
before top center. The flywheel is marked at top center and 5° before top center. Estimate the 9° position, as viewed through
the timing hole opening, Fig. 6, in the flywheel housing on the right side of the engine, by noting distance between the top
center mark and the 5° mark.) With the crankshaft in this position, valve timing is correct if No. 1 intake valve tappet is just
tight against the end of the valve stem. After checking, adjust all of the tappets .0 16” (0.406 mm.). The correct alignment of
the timing gear marks when setting valve timing is indicated in Fig. 8.
Should the timing be incorrect it is advisable to consult your Willys-Overland Dealer.
FIG. 6—FLYWHEEL TIMING MARKS
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