4-15. AUXILIARY POWER UNIT - Continued
4-15.6 Engine Injector Pump.
This task covers
Tool Kit, Master Mechanic,
7270-2003-08 Injector Pump Tester
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Engine need NOT be removed from truck.
Remove pressure line between injection
pump and injector.
Remove delivery union (1), filler (2), filler
shim (3), delivery valve spring (4), gasket
(5), and delivery valve (6).
Install tester (7270-2003-08) in pump
body and install dial gage. (If special
tester is not available, injector timing can
be checked by comparing flywheel timing
marks with fuel being ejected from
instruction 1 and follow with instruction 4
Place fuel rack to maximum fuel delivery,
(throttle at maximum).
Set compression release lever to start
position and set APU key switch to ON.
Check fuel pump starts.
Using rope on engine start pulley, slowly
compression stroke. Stop when fuel spills
out from tester tube (method 1) or from
delivery union (method 2) Adjust dial gage
reading to zero.