TM 5-3825-226-24
more, do the Steps 15 through 19, ADJUSTING FUEL
PUMP CALIBRATION.
NOTE: The mechanic doing the
checking must make the decisions of
which and how many pumps to check
according to the symptoms of the fuel
injection pump being tested.
14.
If dial indicator (4) readings for all the pumps are
within the limits in Step 13, the calibration is
acceptable. Remove the tooling, and install the
parts which were removed.
NOTE: For troubleshooting purposes,
if the dial indicator (4) reading is "0" or
near "0", the calibration of the other
pumps is probably in the tolerance.
Adjustment of Fuel Pump Calibration
15.
Remove all pumps with 8S2243 Wrench.
16.
Clean the barrel and plunger of calibration pump
(I). Put clean diesel fuel on the calibration pump
(I) for lubrication.
17.
Install calibration pump ( I) in the place of one of
the pumps according to the procedure in Step 9.
18.
Loosen bolt (26) with 1S9836 Wrench (8) or
5P4206 Wrench. Turn the lever (18) on shaft
(24) enough to move the top of plunger (28) of
calibration pump (I) below top surface (27) of
calibration pump (1). Tighten bolt (26) just
enough for lever (18) to hold plunger (28)
stationary.
5P4206 WRENCH
18. Lever. 26. Bolt. A. 5P4206 Wrench.
NOTE: When bolt (26) has the correct
torque, pushing with a small amount
of force on lever (18) through the
wrench moves plunger (28) up in
calibration pump (I).
19.
Move shaft (24) toward the governor to remove
end play. Then push down on lever (18) through
the wrench until top of plunger (28) is almost even
with top surface (27) of calibration pump (I) as
shown.
PLUNGER POSITION
1. Calibration pump. 27. Top surface of calibration
pump.
28. Plunger.
20.
Check dial indicator (4) according to Step 10.
Then put dial indicator (4) in place over the center
of calibration pump (I) and hold it there tightly.
Now move plunger (28) of calibration pump (1) by
pushing on lever (18) through the wrench. Stop
moving the plunger when the dial indicator is at
approximately 0.009 mm past "0.000". Tighten
bolt (26) to 24 ± 2 lb. in. (2.8 ± 0.2 N-m).
NOTE: When moving plunger (28),
make sure that the last direction of
plunger (28) movement is in the up
direction. If plunger (28) goes up too
far, move plunger (28) down to a
position below that desired. Then
move plunger (28) up to the desired
position.
NOTE: The action of tightening bolt
(26) usually changes the reading on
dial indicator (4) by approximately
(0.010 mm) in the minus direction.
± 0.010 mm CALIBRATION TOLERANCE
Move shaft (24) toward shutoff several times to
remove clearance in the linkage. Dial indicator (4)
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