Engine Tune-Up
DETROIT DIESEL
determines the amount of fuel injected into each
7.
Loosen the nut which locks the ball joint on the
cylinder and ensures equal distribution of the load.
fuel rod. Hold the fuel rod in the full-fuel position and
Adjust the rear injector rack control lever first to
adjust the ball joint until it is aligned and will slide on the
establish a guide for adjusting the remaining levers.
ball stud on the stop lever (Fig. 4). Position the
shutdown cable clip and tighten the fuel rod lock nut to
1.
Clean and remove the valve rocker cover.
retain the adjustment.
Discard the gasket.
8.
Check the adjustment by pushing the fuel rod
2.
Disconnect the fuel rod at the stop lever.
toward the engine and make sure the injector control
rack is in the full-fuel position. If necessary, readjust the
3.
Loosen all of the inner and outer injector rack
fuel rod.
control lever adjusting screws. Be sure all of the injector
rack control levers are free on the injector control tube.
9.
Manually hold the rear injector rack in the full-
fuel position, with the lever on the injector control tube,
4.
Move the speed control lever to the maximum
and turn the inner adjusting screw of the adjacent
speed position.
injector rack control lever down until the injector rack
moves into the full-fuel position.
Turn the outer
5.
Adjust the rear cylinder injector rack control
adjusting screw down until it bottoms lightly on the
lever adjusting screws (Fig. 3) until both screws are
injector control tube. Then alternately tighten both the
equal in height and tight on the injector control tube.
inner and outer adjusting screws.
6.
Move the rear injector control rack into the full-
NOTE: Overtightening of the injector rack
fuel position and note the clearance between the fuel
control
lever
adjusting
screws
during
rod and the cylinder head bolt. The clearance should be
installation or adjustment can result in damage
1/32" or more. If necessary, readjust the injector rack
to the injector control tube. The recommended
adjusting screws until a clearance of at least 1/32" to
torque of the adjusting screws is 24-36 in-lb.
1/16" exists. Tighten the adjustment screws.
10.
Recheck the rear injector rack to be sure that it
has remained snug on the ball end of the rack control
lever while adjusting the adjacent injector rack. If the
rack of the rear injector has become loose, back off the
inner adjusting screw slightly on the adjacent injector
rack control lever and tighten the outer adjusting screw.
When the settings are correct, the racks of both injectors
must be snug on the ball end of their respective control
levers.
Fig. 3 - Adjusting Injector Rack Control Lever
Adjusting Screws
Fig. 4 Adjusting Fuel Rod Length
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