DETROIT DIESEL
Engine Tune-Up
12.
When all of the injector rack control levers are
2.
With the engine at operating temperature and
adjusted, recheck their settings. With the control tube
no- load on the engine, place the speed control lever in
lever in the full-fuel position, check each control rack as
the maximum speed position. Turn the high-speed
in Step 7. All of the control racks must have the same
spring retainer in (Fig. 6) until the engine is operating at
"spring" condition with the control tube lever in the full-
the recommended no-load speed. Use an accurate
fuel position.
hand tachometer to determine the engine speed. The
maximum no-load speed varies with the full-load
13.
Insert the clevis pin in the fuel rod and the
operating speed.
injector control tube levers.
3.
Hold the spring retainer and tighten the lock nut.
14.
Turn the idle speed adjusting screw in until it
projects 3/16" from the lock nut to permit starting the
TYPE B GOVERNOR SPRINGS (Fig. 7):
engine.
1.
Start the engine and after it reaches normal
operating temperature, remove the load from the
15.
Use new gaskets and replace the valve rocker
engine.
covers.
2.
Place the speed control lever in the maximum
speed position and note the engine speed.
Adjust Maximum No-Load Engine Speed
3.
Stop the engine and, if necessary, adjust the no-
All governors are properly adjusted before leaving the
load speed as follows:
factory.
However, if the governor has been
reconditioned or replaced, and to ensure the engine
a. Remove the high-speed spring retainer with tool
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.
Fig. 6 - Adjusting Maximum No-Load Engine
Speed
Fig. 7 - Governor Spring Assemblies
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