full-fuel position, check each control rack as in Step 7. All of the control racks must have the same "spring" condition with
the control tube lever in the full-fuel position.
I3.
insert the clevis pin in the fuel rod and the injector control tube levers.
14. Turn the idle speed adjusting screw in until it projects 3/16" from the lock nut to permit starting the
engine.
15. Use new gaskets and replace the valve rocker covers.
Adjust Maximum No-Load Engine Speed
All governors are properly adjusted before leaving the factory. However, if the governor has been reconditioned or
replaced, and to ensure the engine speed will not exceed the recommended no-load speed as given on the engine option
plate, set the maximum no-load speed as follows:
TYPE A GOVERNOR SPRINGS (Fig. 7):
1.
Loosen the lock nut with a spanner wrench and back off the high-speed spring retainer several turns. Then start
the engine and increase the speed slowly. If the speed exceeds the required no-load speed before the speed control
lever reaches the end of its travel, back off the spring retainer a few additional turns.
2.
With the engine at operating temperature and no-load on the engine, place the speed control lever in the
maximum speed position. Turn the high-speed spring retainer in (Fig. 6) until the engine is operating at the
recommended no-load speed. Use an accurate hand tachometer to determine the engine speed. The maximum no-load
speed varies with the full-load operating speed.
3.
Hold the spring retainer and tighten the lock nut.
TYPE B GOVERNOR SPRINGS (Fig. 7):
1.
Start the engine and after it reaches normal operating temperature, remove the load from the engine.
2.
Place the speed control lever in the maximum speed position and note the engine speed.
Fig. 6.
Adjusting Maximum No-Load
Engine Speed
Fig. 7. Governor Spring Assemblies
Page 87
DETROIT DIESEL
Engine Tune Up
3.
Stop the engine and, if necessary, adjust the no-load speed as follows:
a.
Remove the high-speed spring retainer with tool J 5895 and withdraw the high-speed spring and plunger
assembly.
