FUEL INJECTOR TIMING MAINTENANCE - continued

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

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FUEL INJECTOR TIMING MAINTENANCE (Contd)

WARNING

Diesel fuel is flammable. Do not perform fuel system procedures

near open flame. Injury to personnel may result.

NOTE

Timing refers to when the fuel is injected into the cylinder. In

order for the engine to run efficiently, the fuel must be injected a

set number of crankshaft degrees before top center (TC).

Always perform injector timing when an injector has been

removed and reinstalled or replaced.

LOCATING TOP CENTER POSITION FOR NO. 1 PISTON

Remove plug (4) and O-ring (3) from timing hole (2) on flexplate housing (1). Discard O-ring (3).

Install timing bolt in timing hole (2) on flexplate housing (1).

NOTE

When turning crankshaft, use the four large screws on front of

crankshaft. Do not use the eight small screws on front of

crankshaft pulley.

If rocker arm assemblies have been removed and installed prior to

setting fuel timing, rotate crankshaft two complete revolutions to

allow rocker arms to properly seat on injectors.

Turn crankshaft clockwise until timing bolt engages non-threaded hole in flywheel.

ADJUSTMENT

Clean holding fixture and set block with lint-free cloth.

Press top ball on pivot arm of holding fixture fully and hold.

Position holding fixture on set block with side edge of set block against stabilizing blade, top edge of

set block against indicator contact point, and inside bottom edge of set block against base of holding

fixture.

Release top ball on pivot arm of holding fixture.

Set double zero on the vertical dial indicator.

a. Loosen red thumb screw on rear of holding fixture and slide vertical dial indicator vertically

until small needle lines up on zero. Tighten red thumb screw.

b. Loosen bezel screw on vertical dial indicator and turn bezel until large needle lines up on zero.

Tighten bezel screw.

Remove set block from holding fixture.

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