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FUEL INJECTOR SYNCHRONIZATION MAINTENANCE
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/.5ton/TM-9-2320-386-24-1-2 Extended Service Program (ESP) for 2-1/2-Ton 6x6 M44A3 Series Trucks (Diesel) Manual
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FUEL INJECTOR SYNCHRONIZATION MAINTENANCE - continued - TM-9-2320-386-24-1-20232
TM 9-2320-386-24-1-2
0321 00
FUEL INJECTOR SYNCHRONIZATION MAINTENANCE (Contd)
WARNING
Diesel fuel is flammable. Do not perform fuel system procedures
near open flame. Injury to personnel may result.
NOTE
Synchronization is the position of all injector racks in relationship
to rack at No. 1 injector. Synchronizing injector racks ensures
each cylinder receives the same amount of fuel for combustion.
The control linkage is at synchronizing position when injector of
No. 1 cylinder is at fuel shutoff. Since No. 1 injector is the
reference point for the other injectors, no synchronizing
adjustment is made to No. 1 injector.
Always synchronize an injector when it has been removed and
reinstalled or replaced. If No. 1 injector is reinstalled or replaced,
all injectors must be syncronized.
TESTING
1.
Clean end of rack bars (3) with lint-free cloth.
2.
Press top ball on pivot arm of holding fixture fully and hold.
CAUTION
Bottom contact point on pivot arm of holding fixture must clear
end of rack bar when inserted into engine. Failure to do so will
cause damage to equipment and result in an inaccurate reading.
3.
While pressing top ball on pivot arm, insert holding fixture with dial indicators at No. 1 injector so
stabilizing blade seats against intake valve spring (1), and spring clip seats against inside of air
intake manifold (2).
4.
Push down on holding fixture and listen for a "snap" sound to ensure holding fixture is seated
against injector base.
5.
Release top ball on pivot arm of holding fixture. Ensure pivot arm contacts face of rack bar (3).
0321 00-2

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