2.1.1 Fuel Injector
DETROIT DIESEL 53
Fig. 35. - Details of Injector Filter and Cap
Showing Their Location Relative to Injector
Body
After washing, submerge the parts if a clean receptable
containing clean fuel oil. Keep the parts of each injector
assembly together.
Inspect Injector Parts
Fig. 36. - Injector Rack, Gear, Spray Tip and
Valve Assembly Details and Relative Location
Inspect the teeth on the control rack and the control rack
of Parts
gear for excessive wear or damage. Also check for
The injector follower spring (.142 " diameter wire) has a
excessive wear in the bore of the gear and inspect the
free length of approximately 1.504" and should be
gear retainer. Replace damaged or worn parts.
replaced when a load of less than 70 lbs. will compress
it to 1.028 ".
Inspect the injector follower and pin for wear. Refer to
Section 2.0.
Inspect both ends of the spill deflector for sharp edges
or burrs which could create burrs on the injector body or
injector nut and cause particles of metal to be
introduced into the spray tip and valve parts. Remove
burrs with a 500 grit stone.
Inspect the follower spring for visual defects. Then
check the spring with spring tester J 9666 and an
Check the seal ring area on the injector body for burrs
accurate torque wrench.
1972 General Motors Corp
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