Cleaning Carburetor Air Cleaner; Description Of Fuel Pump; Disassembly Of Fuel Pump; Assembly Of Fuel Pump - Plymouth Pl4S Service Manual

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FUEL· SYSTEM
127
1-Corburetor air horn 2-Corburetor body gasket
3-Checking gauge (Tool C-449)
Figure
3-Measuring
Float Lev<>l (1936-42 Model•}
B. CLEANING CARBURETOR AIR
CLEANER.
1936-42-The air cleaner should be
cleaned at least every 2000 miles (or more
often if extremely dusty conditions are en-
countered) or whenever oil sump, on oil
bath type, becomes half filled with a semi-
solid mixture of oil and dirt. For servicing
instructions, refer to paragraph
5
on page 14.
9. DESCRIPTION OF FUEL PUMP.
1936-42-The fuel pump (figs. 4
through 7) is the diaphragm non-adjustable
type and is driven off the engine camshaft.
It has a working pressure of 3 to 41/2
pounds on 1936-40 models and 4 to
5112
pounds on 1941-42 models.
10. DISASSEMBLY OF FUEL PUMP.
1939-42-Refer to figures 4 and 5. Re-
move strainer bowl ( 9) and strainer screen
(26). Remove body (4) from cover (8).
Remove valve retainer ( 22) and lift out
valves ( 18) and ( 23). Compress dia-
phragm and unhook it ftom inner rocker .
arm. Remove rocker arm spring ( 11 ) . Drive
out pivot pin ( 2 ) and remove rocker arm.
NOTE
It an excessive amount of oil le<iks
out of vent hole in body above
diaphragm, chip off pieces of
pump body which clinch oil seal
( 6) in place and install new seal.
1936-38-Refer to figures 6 and 7. Mark
the cover and pump body so that they may
be assembled in the same relative position.
Remove filter bowl, screen and gasket. Re-
move inlet valve plug ( 8), spring and valve
( 7).
Remove body bottom cover, gasket,
rocker arm springs and spring seats. Remove
top cover and valve seat (
6)
and diaphragm
( 2 ) . Remove rocKer arm links ( 14) and
push rod ( 5). Remove rocker arm pin ( 28),
rocker arm and linkage.
11. ASSEMBLY OF FUEL PUMP.
1939-42-Refer to figures 4 and 5. Be-
fore assembling, wash all parts thoroughly
in gasoline or kerosene. When assembling
inlet and outlet valves ( 18 and 23 ), make
certain they are assembled as shown in fig-
ure 5. Both of these valves are identical, but
one should be assembled with the spring side
"up" and the other with spring side "down."
Install a new diaphragm, soaking it in clean
kerosene to make it flexible and to facilitate
seating.
CAUTION
Do not use shellac or other seal-
ing compounds on diaphragm.
If rocker arm spring is collapsed, install a
new one. Use care to hold rocker arm to end
of its stroke tight against spring . pressure
;,;,hen tightening screws which hold cover
to body. When installing cover, partially
tighten screws in order to properly locate
diaphragm, then tighten screws evenly to
prevent creasing diaphragm.