Table 9-3. Preventive Maintenance Checks and Services for Electrical Power Systems(Continued)
B - Before
D - During
A - After
H - Hourly Interval
CHECK FOR AND HAVE
IS NOT READY/
REPAIRED OR ADJUSTED
B D A
After servicing fuel filters, prime engine fuel
system by performing the following:
Air must be vented from fuel system
whenever any part of system between fuel
tank and injection pump has been discon-
nected for any reason or when system has
been emptied of fuel. Injection pump is
lubricated by the fuel it is pressurizing and
metering. If air enters injection pump, it may
be severely damaged. Never attempt to
start engine until injection pump has been
filled and primed. Procedures to make sure
injection is primed with fuel if system has
been run dry, are on pages N.14- 15,
Perkins Engines Workshop Manual, 4.236M.
The following instructions are only for prim-
ing fuel system after a PMCS of fuel filters.
Remove vent plug on filter cover.
Loosen joint at filter end of filter to
tank return pipe.
Place shop cloths below filter assem-
bly to absorb fuel oil spills.
Operate fuel pump priming lever until
fuel oil that comes out of filter cover
vent is free from bubbles.
If fuel pump priming lever will not oper-
ate, cam on engine camshaft driving fuel
pump is on maximum lift. Engine must be
turned by hand one complete revolution
before priming lever will operate.
Replace vent plug on filter cover. Con-
tinue operating priming lever until fuel
oil that comes from around threads of
the return pipe is free from bubbles.
Tighten return pipe joint.
Loosen joint at filter to injection pump
feed pipe. Operate priming lever until
fuel oil that comes from around
threads of this pipe is free from bub-
bles. Tighten joint.