Fuel Injection Pump Adjustments (cont).

TM 10-3930-638-24&P

3-5. ENGINE MAINTENANCE (cont

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

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

Para 3-5f

j. Tachometer drive

Install

cover

3-37