TM 9-2815-237-34
2-140.10
2-35.2. (6.5L) FUEL INJECTION PUMPS (DB2831-5485 OR DB2831-5079) 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.
23.
Disconnect pump and mount in holding fixture.
NOTE
Perform step 25 to check pump timing on the DB2831-5079.
24.
Using air timing gauge, check pump timing. Set to +0.25 degree ± 0.50 degree.
25.
Using air timing gauge, check pump timing. Set to 0 ±0.50 degrees
26.
Tighten all fasteners to specifications. Refer to para. 2-32d.
THROTTLE
MM3/
CAM MOVEMENT
PRESSURE
RPM
POSITION
STROKE*
(DEGREES)
TRANSFER PUMP
HOUSING
150
Low-idle
37 min.
16 psi (110 kPa) min.
0-12 psi (0-83 kPa)
400
WOT
58 min.
400
WOT**
4 max.
400
Low-idle***
700
Low-idle
12-16
3.5 min.
8-12 psi (55-83 kPa)
700
Low-idle
1.25 min.
0-1 psi (0-7 kPa)
1500
WOT
4 max.
1500
WOT
68.5-69.5
2000
WOT
56 max.
****
60-62 psi (414-427 kPa)
3200
WOT
59.5 min.
2.50-3.60
3200
ADJ
21.5-23.5
5.25-7.25
3200
Low-idle
11-12
3400
WOT
49-52
3.50-4.50
3500
WOT
45 min.
3650
WOT
31.5 min.
3900
WOT
15 max.
125 psi (862 kPa) max.
* Maximum cylinder variation should be ± 6 mm3 from the average flow of all cylinders.
** With electric shut-off solenoid de-energized.
*** Check electric shutoff solenoid for pull-in with 8.8 volts maximum.
**** Minimum of 1.25 degrees more than reading.
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