DETROIT DIESEL
Engine Tune-Up
Inspection
When inspecting the throttle delay hydraulic cylinder, it
is important that the check valve be inspected for wear.
Replace the check valve if necessary.
To inspect the check valve, fill the throttle delay cylinder
with diesel fuel oil and watch for check valve leakage
while moving the engine throttle from the idle position to
the full fuel position.
Adjustment
Whenever the injector rack control levers are adjusted,
disconnect the throttle delay mechanism by loosening
the U-bolt which clamps the lever to the injector control
tube. After the injector rack control levers have been
positioned, the throttle delay mechanism must be re-
adjusted. With the engine stopped, proceed as follows:
1. Refer to Fig. 5 and insert gage J 23190 (.454"
setting) between the injector body and the shoulder on
the injector rack. Then exert a light pressure on the
injector control tube in the direction of full fuel.
2. Align the throttle delay piston so it is flush with the
edge of the throttle delay cylinder.
3. Tighten the U-bolt on the injector control tube and
remove the gage.
Fig 5. Adjusting Throttle Delay Cylinder
4. Move the injector rack from the no-fuel to full-fuel to
make sure it does not bind.
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