TM-9-2320-280-34

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

JANUARY 1996

  TM-9-2320-280-34 - Page 100 of 1258

TM 9-2320-280-34
3 - 19.
ENGINE INJECTION PUMP TIMING
This task covers:
a.
Timing Check
b.
Timing Adjustment
INITIAL SETUP:
Tools
Manual References
General mechanic's tool kit:
TM 9-2320-280-10
automotive (Appendix G, Item 1)
TM 9-2320-280-20
Special Tools
Equipment Condition
Timing bracket gauge (Appendix G, Item 20)
Hood raised and secured (TM 9-2320-280-10).
Dynamic timing meter (Appendix G, Item 21)
Engine access cover removed (TM 9-2320-280-20).
Companion seat and battery box cover removed
Materials/Parts
(TM 9-2320-280-20).
Metallic wool (Appendix B, Item 60)
General Safety Instructions
Personnel Required
Never adjust timing while engine is running.
One mechanic
One assistant
Maintenance Level
Direct support
a.
Timing Check
NOTE
Magnetic pickup receptacle on timing bracket must be correctly
positioned or timing meter will not register correctly.
1.
Insert timing bracket gauge into magnetic pickup receptacle (8) on timing bracket (1).
2.
Rotate timing bracket gauge so pointer on gauge fits into TDC notch (9) in timing bracket (1).
3.
If pointer on gauge does not fit exactly into TDC notch (9), bend magnetic pickup receptacle (8) until
pointer on gauge fits exactly into TDC notch (9).
4.
Remove timing bracket gauge from pickup receptacle (8) on timing bracket (1).
NOTE
End of magnetic pickup must be .06 in.
(1.5 mm) from torsional
damper.
5
Install magnetic pickup (7) into magnetic pickup receptacle (8) and connect pickup lead (6) to timing
meter.
NOTE
Clamp-on pickup must be used on a straight section of tube no
further than 4 in.
(10 cm) from injection nozzle.
6.
Clean cylinder number one injection line (2) with metallic wool.
CAUTION
Do not overtighten clamp-on pickup or damage to pickup will result.
7.
Install pickup (4) on injection line (2).
8.
Connect ground clip (3) to fuel injection line (2) and connect pickup lead (5) to timing meter.
9.
Route power leads of timing meter into battery compartment and connect red power lead (11) to
positive battery terminal (12) on rear battery (14).
10.
Connect black ground lead (10) to negative battery terminal (13) on rear battery (14).
Display
should light up and read: SE-1 20.0.
3-40


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