DETROIT DIESEL 53
Fuel Injector 2.1.1
Fig. 28. - Cleaning Spray Tip Orifices
NOTE: Refer to Section 2.0 for
different factors that may affect the
injector calibrator output reading.
The comparator or the calibrator may be used to check
and select a set of injectors which will inject the same
amount of fuel in each cylinder at a given throttle
setting, thus resulting in a smooth running, well
Fig. 26. - Removing Spray Tip from Injector
An injector which passes all of the above tests may be
vial. The fuel flow to the vial will automatically stop
put back into service. However, an injector which fails
after 1,000 strokes.
to pass one or more of the tests must be rebuilt and
7. Shut the calibrator off (the calibrator will stop in less
time at full-fuel).
Any injector which is disassembled and rebuilt must be
tested again before being placed in service.
8. Observe the vial reading and refer to Fig. 19. to
determine whether the injector fuel output falls within the
specified limits. If the quantity of fuel in the vial does
If required, disassemble an injector as follows:
not fall within the specified limits, refer to Trouble
Shooting Chart 6 and Shop Notes in section 2.0 for the
1. Support the injector upright in injector holding fixture
cause and remedy.
J 22396 (Fig. 23.) and remove the filter caps, gaskets
Figure 27. - Cleaning Injector Spray Tip
Fig. 29. - Cleaning Injector Body Ring
1972 General Motors Corp..
SEC. 2.1.1 Page 13