A bent injector control tube return spring may cause friction in operation of injector control tube. If spring
has been bent or damaged, install a new spring.
Check for binding at pin which connects fuel rod to injector control tube lever. Replace pin if necessary.
After making preceding checks, if governor fails to control engine properly, governor must be removed and
5-42 Governor adjustment
Governor adjustments must be made simultaneously with adjustment of valves, injectors and
control rod assembly. Do not adjust governor unless a complete tune-up is accomplished.
Air Gap Adjustment
Disconnect governor control linkage and remove governor top cover as illustrated in Figure 5-19.
Adjust governor air gap to 0. 0016 inch.
Positioning Injector Control Levers
The position of fuel injector control rack must be set in relation to governor. Their position determines
amount of fuel injected into each cylinder and ensures equal distribution of load. Properly positioned injector rack control
levers with engine in full load will result in following:
Speed control lever at maximum position.
Governor low-speed gap closed.
Stop lever in run position.
High speed spring plunger on seat in governor control housing.
Injector fuel control rack in FULL FUEL position.
Adjust number 1 injector control rack lever first to establish a guide for adjusting remaining injector rack
Adjust fuel injector control levers.
Maximum No-Load Speed Adjustment. Maximum no-load speed on engines equipped with variable speed
governors must not be less than 125 rpm or more than 150 rpm above recommended load speed. Using a hand
tachometer, determine maximum no-load speed of engine. If required, make following adjustments: