DELIVERY VALVE FUNCTION
The delivery valve maintains 300 to
600
psi
(2070
to
4140
kPa) line pressure in the injector lines with the
engine running, Figure 32.This pressure increasesto
about 1900 psi (13110 kPa) on each stroke of the
injection pump plunger. The trapped fuel is held
in
the lines at all times, even though the pressure bleeds
off during shutdown periods. When the lines are full of
fuel, onlyacoupleturnsof thecrankshaft are required
to build up enough line pressure for firing the
injectors.
SPRING
\
DELIVERY VALVE
.
SEAT
-INE PRESSURE
FIGURE
32.
DELIVERY VALVE CLOSED
-
PLUNGER DOWN
BLEEDING FUEL SYSTEM
Bleed fuel system wheneverthe filters are changed
or
when there is air
in
the lines.
Procedure:
Manually actuate fuel transfer pump until air bubbles
are all out and clear fuel flows from the bleed valve
automatically, Figure 33.
If
the transfer pump
cam
lobe
is
on the high side, the priming lever
will not operate the pump. Rotate the flywheel one revolution
before operating the priming lever.
BLEED VALVE
FUEL RETURN
CONNECT
LINE
11
FIGURE
33.
BLEEDING FUEL SYSTEM
35
Redistribution or publication of this document,
by any means, is strictly prohibited.
To Next Page
Loading...
Need help?
General
