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TM 10-3930-627-12
Note. Figure 4-17 shows one type timing light.
distributor  clockwise to advance timing;  rotate  it
counterclockwise to retard timing.  Tighten the clamp
Any available timing light may be used.
nuts to secure adjustment.
1. CONNECT TEST EQUIPMENT AS ILLUSTRATED
2. PLACE VOLTAGE SELECTOR SWITCH IN 12 VOLT POSITION
3. START ENGINE AND ADJUST SPEED TO 500 RPM
4. AIM TIMING LIGHT AT TIMING MARKER ON FLYWHEEL COVER. TIMING MARK ON FLYWHEEL
SHOULD ALIGN WITH MARKER
5. ACCELERATE ENGINE TO APPROXIMATELY 1, 500 R P M TIMING MARK SHOULD MOVE AHEAD OF
TIMING MARKER INDICATING THAT SPARK ADVANCE IS OPERATING PROPERLY
ME-3930-627-1 2/4-17
Figure 4-17. Using ignition timing light.
4-22

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