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FUEL INJECTOR SYNCHRONIZATION MAINTENANCE - continued - TM-9-2320-386-24-1-20236
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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-9-2320-386-24-1-20238
TM 9-2320-386-24-1-2
0321 00
FUEL INJECTOR SYNCHRONIZATION MAINTENANCE (Contd)
24.
While keeping top ball on pivot of holding fixture arm pressed, insert holding fixture with dial
indicators at the next injector so stabilizing blade seats against intake valve spring (1), and spring
clip seats against inside of air intake manifold (2).
25.
Push down on holding fixture and listen for a "snap" sound to ensure holding fixture is seated
against injector base.
26.
Release top ball on pivot arm of holding fixture. Ensure pivot arm contacts face of rack bar (4).
27.
Move control linkage positioning tool toward push rod side of engine to rotate control linkage
shaft (1), and hold.
NOTE
Reset double zero on horizontal dial indicator whenever holding
fixture has been removed and reinserted.
Assistant will help with step 28.
28.
While holding control linkage positioning tool toward push rod side of engine, set double zero on
horizontal dial indicator.
a. Loosen red thumb screw on side of holding fixture and slide horizontal dial indicator laterally
until small needle lines up on zero. Tighten red thumb screw.
b. Loosen bezel screw on horizontal dial indicator and turn bezel until large needle lines up on
zero. Tighten bezel screw.
29.
Pull and release control linkage positioning tool several times to ensure horizontal dial indicator
reads double zero on push rod side of engine.
a. If horizontal dial indicator reads double zero, go to step 30.
b. If horizontal dial indicator does not read double zero, repeat steps 27, 28, and 29.
CAUTION
Do not adjust limit screw.
30.
Move control linkage positioning tool toward injector side of engine. Ensure horizontal dial
indicator reads 4.0 mm 0.02 mm, and limit screw is seated against cylinder head.
a. If horizontal dial indicator reads 4.0 mm 0.02 mm, go to step 33.
b. If horizontal dial indicator does not read 4.0 mm 0.02 mm, go to step 31.
31.
Using adjusting tool, loosen jamnut (7) and adjust setscrew (5) on synchronization clamp (6) until
horizontal dial indicator reads 4.0 mm 0.02 mm.
NOTE
Thread pull can cause adjustment to change when jamnut is
tightened, and readjustment may be necessary.
32.
Tighten jamnut (7) on synchronization clamp (6) with adjusting tool.
33.
Pull and release control linkage positioning tool several times to ensure horizontal dial indicator
reads double zero on the push rod side and 4.0 mm 0.02 mm on the injector side.
a. To reset double zero, repeat steps 27, 28, and 29.
b. To reset 4.0 mm 0.02 mm, repeat steps 30 through 33.
34.
Repeat steps 23 through 33 until all injectors are synchronized.
35.
Remove holding fixture with dial indicators from injector by pressing top ball on pivot arm of
holding fixture fully and pulling holding fixture straight up. Release pivot arm after removal.
36.
Loosen clamping screw on control linkage positioning tool.
37.
Remove control linkage positioning tool from control linkage shaft (3).
38.
Install fuel shutoff solenoid (WP 0050 00).
39.
Perform fuel injector timing maintenance (WP 0322 00).
0321 00-8

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