FUEL INJECTOR SYNCHRONIZATION MAINTENANCE - continued

TM 9-2320-386-24-1-2

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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

Clean end of rack bars (3) with lint-free cloth.

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.

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).

Push down on holding fixture and listen for a "snap" sound to ensure holding fixture is seated

against injector base.

Release top ball on pivot arm of holding fixture. Ensure pivot arm contacts face of rack bar (3).

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