TM 9-2815-237-34
2-34. 1990 (6.2L) FUEL INJECTION PUMP (DB2829-4879) CALIBRATION (Cont’d)
22. Fuel delivery measurement:
(a) In order to minimize variations between readings due to residual oil in the graduates, the
following timed cycle should be used:
(1) Draw
(2) Settle 30 seconds
(3) Drain 30 seconds
(4) Draw
(5) Settle 30 seconds
(6) Read graduates
(7) Repeat cycle and average readings
(b) Check points:
(1) At 1500 rpm (WOT) de-energize electric shutoff solenoid. Delivery should be 4 mm3/stroke
maximum.
(2) Re-energize electric shutoff solenoid and check delivery against the chart below.
THROTTLE
MM’/
CAM MOVEMENT
PRESSURE
RPM
POSITION
STROKE*
(DEGREES)
TRANSFER PUMP
HOUSING
150
WOT
28 min.
12 psi (83 kPa) min.
0-12 psi (0-83 kPa)
400
WOT
45 min.
400
WOT**
4 max.
400
Low idle***
650
Low idle
12-16
8-12 psi (55-83 kPa)
650
Low idle
1.25 min.
0-1 psi (0-7 kPa)
1500
21.5-23.5
1.0-3.5
2000
WOT
56 max.
60-62 psi (414-427 kPa)
2400
WOT
0.5-3.0
3200
Low idle
9.0-10.0
3500
WOT
48-53
4.5-6.5
3600
WOT
47 min.
3800
WOT
33 min.
4050
WOT
15 max.
125 psi (862 kPa) max.
* Maximum cylinder variation should be ± 6 mm3 from the average flow of all cylinders.
** With housing pressure cold advance solenoid energized.
*** Check electric shutoff solenoid for pull-in with 17.6 volts maximum.
23. Disconnect pump and mount in holding fixture.
24. Using air timing gauge, check pump timing. Set to +0.25 degree ± 0.50 degree.
25. Tighten all fasteners to specifications, refer to para. 2-32d.
26. Apply sealing compound as follows:
(a) Apply one drop at interface of maximum travel screw and locknut.
CAUTION
Do not allow sealing compound to enter gap between face cam and
housing. Binding of the throttle shaft may result.
(b) Apply one drop to threaded end of face cam screw where it protrudes from face cam.
(c) Apply one drop to interface of servo advance adjusting screw and rocker lever, making sure
sealing compound does not enter hex recess of screw.
27. Install tamper-proofing cap on guide stud.
2-135
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