Repair:
Repair kits are available that provide replacements
for those parts of the pump most subject to wear. If
the operator chooses to repair the pump rather than
install a new one, the use of all parts included in the
repair kit is recommended. Proceed as follows:
1.
After the pump is removed from the engine,
scribealineon theflangesoftheupperand lower
pump bodies to assure correct positioning when
reassembling.
2.
Remove the securing screws and separate the
upper and lower pump bodies.
3.
Detach the valve cage retainer from the pump
upper body. Noting their position, remove the
valve and cageassemblies and their gasket sfrom
the retainer (Figure
19).
UPPER PUMP BODY
8R
LOWER SIDE
DIAPHRAGM CASK
IAPHRAGM
RETURN
ROCKER
AR
ROCKER
ARM
LIN
PRIMING
LEV
FIGURE
19.
MECHANICAL FUEL PUMP
-
EXPLODED VIEW
4.
5.
tweezers to compress the spring and tip
it
off the
rocker arm catch. When installing the newspring,
make sure it is properly placed before remount-
.
ing the pump.
6.
Clean
in
solvent all pump parts that will not be
replaced and allow to dry.
7.
Install the new valve and cage assemblies and
their gaskets in the retainer.
Be
sure the assem-
blies are in proper position and fully seated. Rein-
stall the retainer and assemblies in the pump
upper body.
8.
To install the new pump diaphragm, turn the
pump lower body upside-down and place the
diaphragm and spring in the body. Press the base
of the diaphragm up into the body of the pump
and turn
1/4
turn.
.
9.
Install new rocker arm return spring. Check for
proper spring placement.
10.
Place the upper and lower bodies
of
the pump
together with the scribe marks aligned. Start the
four securing screws, making sure they do not
chew into thediaphragm fabric. Leave thescrews
2
or
3
turns loose.
11.
Operate the rocker arm several times
to
flex the
new diaphragm fully. While holding the rocker
arm fully flexed, tighten the body screws.
-1
Failure
to
flex fhe rocker arm
fully while tighfening fhe pump
bodies together will result in excessive pump
pressure and possible engine flooding or pump
diaphmgm failure.
Installation:
1.
Remove all gasket material from mounting faces
and spacer (if used). Apply oil-resistant sealer to
both sides of the gasket(s) and
to
the threads
of
the attaching capscrews.
2.
Place the gasket (and spacer if used) on the
mounting face of the pump. Slide the mounting
capscrews through the pump and gasket (and
spacer) to prevent thegasketfromslipping out
of
place.
3.
Lightly place the pump
in
position on the engine,
making sure the rocker arm is riding o,n the cam-
shaft lobe. Start both capscrews and check for
proper gasket placement.
Detach the pump diaphragm by pressing its metal
base into the pump body and turning it
1/4
turn.
The rocker arm return spring can normally be
removed without removal of the rocker arm from
the pump body. Use a small screwdriver or
4.
Connect the fuel inlet and outlet lines.
5.
Operate the engine and check for leaks.
.
21
To Next Page
Loading...
Need help?
General
