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TM 10-3930-638-24&P
a. Engine Tune-up (cont).
(3) Fuel Injection Pump Adjustments (cont).
STEP
LOCATION
ITEM
ACTION
REMARKS
ENGINE NO-LOAD GOVERNED SPEED ADJUSTMENT (cont)
With accelerator pedal fully depressed,
c. Tachometer
Position
3
press conical tip against tachometer drive
(cont)
shaft on engine until tachometer hand
stops moving, then note reading
NOTE
Tachometer drive shaft operates at one half engine speed.
Double tachometer reading to obtain engine RPM.
Repeat step c above to recheck no-load
d. Engine no-load
Measure
governed speed
governed speed. If no-load governed
speed is 2230-2270 RPM, proceed to step
j. If speed is not correct, proceed to step e.
e. Wire seal
Cut and remove
f. Lock nut
Loosen
g. High speed screw
Adjust
Adjust 1/2 turn at a time and recheck
no-load governed speed. Repeat until
engine no-load governed speed is
2230-2270 RPM
NOTE
Turn high speed screw out (counterclockwise) to increase engine
speed. Turn high speed screw in (clockwise) to decrease engine
no-load governed speed.
h. Lock nut
While holding high speed screw
Tighten
i. New wire seal
Install and seal
On high speed screw
j. Tachometer drive
Install
cover
3-37

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