Service Manual User Manual

General Information, Specifications, and Maintenance
2-27
IMPORTANT: DO NOT attempt to start the engine until
the injection pump has been filled and primed with fuel.
Serious damage to the lift pump will result due to lack of
proper lubrication.
Figure 2–33. Perkins vent plug and filter head locations.
1. To vent air from the low pressure fuel lines, loosen
the vent plug until fuel, free of air, comes out of the
vent plug. Tighten the vent plug.
Note: If the lift pump drive cam is at the point of maxi-
mum lift, it will not be possible to operate the priming
lever. In this situation, the crankshaft must be turned one
revolution.
2. Loosen the high pressure connections at the
injectors. Verify that the manual stop control is in the
RUN position. Operate the starter motor until fuel,
free of air, comes out of the pipe connections.
Tighten the connections to 16 lb/ft (22 Nm).
Figure 2–34. Perkins high pressure line
and injector locations.
Figure 2–35. Cummins vent screw, hand plunger
and lift pump locations.
1. To vent the low pressure lines and fuel filter, open the
vent screw located on the filter head. Operate the
hand plunger on the lift pump until fuel flowing from
the fitting is free of air. Tighten the vent screw and
torque to 7 lb/ft (9 Nm).
IMPORTANT: When cranking the engine with the starter
motor to vent air from the fuel system, DO NOT energize
the starter solenoid or crank the engine for more than
15 seconds at a time. Wait two minutes between each
15-second cranking interval.
2. Operate the starter motor for no more than 15 seconds.
The process of venting the high pressure fuel lines
involves energizing the starter motor, which rotates
the crankshaft, which, in turn, operates the fuel pump
to purge air from the high pressure fuel lines.
3. Loosen one fitting at the injector (Fig. 2–36). Operate
the starter motor for 15 seconds. Wait two minutes.
Operate the starter motor again for 15 seconds.
Repeat this process until fuel, free of air, comes out
of the injector fitting.
PERKINS ENGINE
OS0731
Vent
Plug
Filter Head
OS0731
High Pressure Line
Injector
WARNING: KEEP CLEAR of spraying fuel.
Diesel fuel will spray when venting high pres-
sure lines. The fuel pressure is sufficient to
penetrate the skin and cause serious bodily
injury. Wear protective clothing and safety
glasses.
CUMMINS ENGINE
OS1450
Vent Screw
Hand
Plunger
Lift
Pump
Model 3606 • Origin 10/99