7. Shut the calibrator off (the calibrator will stop in less
time at full-fuel).
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
not fall within the specified limits, refer to Trouble
the cause and remedy.
factors that may affect the injector
calibrator output reading.
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 balanced engine.
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 calibrator.
Any injector which is disassembled and rebuilt must be
Fig. 26. Removing Spray Tip from Injector Nut
tested again before being placed in service.
sound briefly until the lubricating oil
reaches the proper pressure.
5. After the calibrator has started, set the injector rack
If required, disassemble an injector as follows:
into the full-fuel position. Allow the injector to operate
for approximately 30 seconds to purge the air that may
1. Support the injector upright in injector holding fixture
be in the system.
J 22396 (Fig. 23) and remove the filter caps, gaskets
6. After the air is purged, press the fuel flow start button
(red). This will start the flow of fuel into the vial. The
fuel flow to the vial will automatically stop after 1000
disassembled, discard the filters and
gaskets and replace with new filters
and gaskets. In the offset injector, a
filter is used in the inlet side only.
No filter is required in the outlet side
2. Compress the follower spring as shown in Fig. 11.
Fig. 27. Cleaning injector Spray Tip
Fig. 28. Cleaning Spray Tip Orifices