TM 5-3805-262-34
3-1. ENGINE MAINTENANCE (CONT)
a. Engine Tune-up (SHEET 16 OF 21).
(7) Fuel Injection Governor Adjustments (Cont).
Idle Speed Adjustment.
Start engine and operate
until normal operating
temperature is obtained.
With engine idling, press
tachometer against engine
tachometer drive shaft. When
tachometer pointer stops
moving, note indication.
Engine idle speed should be
700 to 750 rpm.
NOTE
Tachometer drive shaft operates at half engine speed. Double tachometer
indication to obtain engine rpm.
If tachometer indication is not 700 to 750 rpm, perform the following
to adjust idle speed.
Remove cap nut and gasket.
Loosen nut and turn idle speed
screw 1/4 turn using screw-
driver. To increase idle speed,
turn screw clockwise; to
decrease speed, turn screw
counterclockwise.
Hold idle speed screw using
screwdriver and tighten nut.
Check if tachometer indicates
idle speed of 700 to 750 rpm.
Repeat steps 4 thru 6 above un-
til idle speed is 700 to 750
rpm.
Install gasket and cap nut.
3-18
