TM 9-2320-272-24-4
5-37. FUEL INJECTION PUMP CALIBRATION (Contd)
b. Cylinder Phasing (Timing)
NOTE
l When phasing (timing) cylinders, test stand calibration fluid
pressure must be set at 435-464 psi (2,999-3,199 kPa).
l When performing this task, correct prestroke measurement
must be obtained for cylinder number one. Refer to task a.
1.
Zero test stand protractor (6) on drive end of test stand (5).
2.
Close all bleedoff valves (2) except for cylinder number five.
NOTE
When bleedoff valve is opened, a stream of calibration fluid will
flow from bleedoff valve. If not, increase fluid pressure until a
stream of calibration fluid is obtained.
3.
Open bleedoff valve (2) on test nozzle (3) for cylinder number five.
4.
Manually rotate test stand driveshaft (7) in correct rotation of fuel pump (4) until calibration fluid
starts to drip from number five bleedoff valve (2).
5.
Observe reading on test stand protractor (6). Correct reading is 60.
NOTE
l Following fuel pump firing order 1-5-3-6-2-4, repeat steps 2
through 5 until remaining cylinders are phased (timed).
l For each cylinder phased (timed), test stand protractor should
increase in 60 intervals.
6.
If 60 intervals are not obtained, adjust shims under barrel (1) (task a).
7.
If any adjustments are made to bring the remaining cylinders to specification, repeat steps 1
through 6 to ensure all cylinders are phased (timed) to specifications.
5-266
