Fuel System Operation and Tests
For example, to obtain an 850 rpm slow idle speed,
use the slow idle stop screw to set speed at
approximately 800 rpm. Then increase speed to 850
rpm using the (bumper) spring adjusting screw.
NOTE: Increasing the slow idle speed a slight amount
above the specified speed range may help to
reduce engine surge (or hunting). If this occurs,
use the procedure given above; but do not exceed
6. If engine surging or hunting persists at slow idle, the
bumper spring and adjustment screw (A) may need to
be replaced with a new one.
IMPORTANT: Remove the pump from the engine and
have it repaired by an authorized diesel
repair station (ADS shop). See Group 35
for fuel injection pump removal and
7. Again check the fast and slow idle speeds. Readjust
slow idle speed if not correct.
8. Check all adjusting screw lock nuts for tightness. Install
covers (and copper washers) on slow idle stop screw
and idling spring adjusting screw.
9. Connect fuel shut-off cable and speed control rod.