TM 9-2320-272-24-4
5-32. FUEL INJECTION PUMP PRETEST (Contd)
In order to perform this task, correct prestroke measurement must
be obtained for cylinder number one (task a).
Set protractor (1) on drive end of test stand (6) to zero.
1.
Remove plug (7) from fuel pump (4).
2.
Install two new copper washers (5), plug (7), and adapter (8) on fuel pump (4).
3.
Connect test stand return line (2) to fuel pump adapter (8).
4.
Apply 435-464 psi (2,999-3,199 kPa) of calibration fluid pressure to fuel pump (4).
5.
Manually rotate test stand driveshaft (3) in correct rotation of fuel pump (4) until calibration fluid
6.
stops flowing from number five bleed-off valve.
Observe reading on protractor (1). Correct reading should be 60.
7.
NOTE
Following fuel pump firing order 1-5-3-6-2-4, repeat steps 6
and 7 until remaining cylinders are phased (timed).
For each cylinder phased, test stand protractor will increase in
60 intervals.
Perform steps 8 through 11 if 60 interval is not obtained.
Perform steps 8 through 11 to adjust one cylinder. Adjustment
of remaining five cylinders is performed basically the same way.
Remove fuel test line (9) from delivery valve holder (10).
8.
Loosen three nuts (11) and remove two shims (12) between barrel (13) and fuel pump (4). Discard
9.
shims (12).
CAUTION
Shims of the same thickness must be used on both sides of barrel.
Failure to do so will result in inaccurate prestroke measurement.
NOTE
Refer to TM 9-2320-272-24P to select shims.
Install two new shims (12) between barrel (13) and fuel pump (4).
10.
Tighten three nuts (11) and install fuel test line (9) on delivery valve holder (10).
11.
5-216