DETROIT DIESEL 53
Fuel lnjector 2.1.1
Fig 28 - Cleaning Spray Tip Orifices
An injector which passes all of the above tests may be
put back into service. However, an injector which fails
to pass one or more of the tests must be rebuilt and
checked on the comparator or the calibrator.
Any injector which is disassembled and rebuilt must
be tested again before being placed in service.
Disassemble Injector
Fig 26 - Removing Spray Tip from Injector
Nut
If required, disassemble an injector as follows:
the specified limits. If the quantity of fuel in the vial
does not fall within the specified limits, refer to
1. Support the injector upright in injector holding
Trouble Shooting Chart 6 and Shop Notes in
fixture J 22396 (Fig. 23) and remove the filter caps.
section 2.0 for the cause and remedy.
gaskets and filters.
NOTE: Refer to Section 2.0 for different factors
that may affect the injector calibrator output
NOTE: Whenever a fuel injector is disassem-
reading.
bled, discard the filters and gaskets and replace
with new filters and gaskets. In the offset
The comparator or the calibrator may be used to check
injector, a filter is used in the inlet side only. No
and select a set of injectors which will inject the same
filter is required in the outlet side (Fig. 34).
amount of fuel in each cylinder at a given throttle
s e t t i n g , thus resulting in a smooth running, well
balanced engine.
2. Compress the follower spring as shown in Fig. 11.
Fig. 27 - Cleaning Injector Spray Tip
Fig. 29 Cleaning Injector Body Ring
March, 1973
SEC. 2.1.1 Page 13
