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Figure 4-10. Starter Motor, Repair Parts
Up
TM-55-4920-405-13-P Test Stand Hydraulic System Gasoline Engine Driven Type D-5C Manual
Next
Figure 4-11. Fuel Pump, Exploded View
TM 55-4920-405-13&P
Insert the end of a small screwdriver
(i)
( b ) Zenith Carburetor. Repair this car-
into the coils of rocker arm spring
buretor as follows:
(12), and remove the spring.
Disassemble the carburetor.
1.
(j)  Hold mounting bracket (15) in your
left hand, with the rocker arm turned
toward your body.  Put your left hand
2.
Clean all parts thoroughly. Blow
thumb nail on the end of link (10).
out all passages with low-pres-
sure air.  Do not use a drill or
With the heel of your right hand on
diaphragm (1), compress diaphragm
wire to clean out passages.
spring (11) and, at the same time,
3.
Inspect float assembly (36). Re-
pull toward your body. Unhook link
place it if it is loaded with gaso-
line. if it is damaged. or if the
(10) from the end of diaphragm (1),
float axle bearing is worn. In-
and remove the diaphragm.
(k)  Drive out rocker arm pin (13). Use
spect the float lever for wear at
the point of contact with fuel valve
a punch and drive it from the small
end.
needle (31). Replace the float
assembly if wear is excessive.
(l)  Clean mounting bracket (15) with
kerosene or diesel fuel.
4.
Replace float axle (35) if its bear-
(m) Assemble new link (10), bushing (9),
ing surface is worn.
and rocker arm (14). Install these
5.
Replace fuel valve needle and fuel
parts in mounting bracket (15), using
valve seat (31) as a unit if either
of these parts is worn.
pin (13). Stake pin (13) to mounting
bracket (15) to hold the pin in place.
6.
Inspect the tapered end of idle
(n)  Place new diaphragm spring (11) into
adjusting needle (17). Make sure
that it is smooth and free of
mounting bracket (15). Use a new
grooves; otherwise, replace the
diaphragm (1), and install the dia-
idle adjusting needle.
phragm by reversing the procedure of
step (j).
7.
Replace all gaskets. throttle shaft
seal (15), and retainer (14).
(0)  Assemble new rocker arm spring (12).
(p)  Mount the mounting bracket and as-
Replace all other parts that show
8.
signs of wear or damage.
sembled parts on the fuel pump
Reassemble the carburetor.
9.
adapter on the engine. Use a new
flange gasket (17).
Note the following special instruc-
tions during reassembly:
(q)  Crank the engine to a position where
diaphragm (1) is lying fiat on mount-
To install float assembly (36),
ing bracket (15).  Place fuel head (16)
a.
install fuel valve needle in
with its attached parts in position so
seat (31).  Then, install float
that the groove marks you made in
assembly (36) and float axle
step (a) are in line. Insert screws (3)
(35).
and turn them in about three turns.
(r)  Crank the engine to a position where
NOTE
diaphragm (1) is pulled down to its
lowest position in mounting bracket
Insert the tapered end of float axle (35) in-
(15). Tighten screws (3).
to the float bracket on the side opposite the
slot, and push it through to the other side.
(2)
C a r b u r e t o r .  You will find either of two
Press float axle (35) into the slotted side
types of carburetors on your engine.
until the float axle is centered in the float
Identify your carburetor, and repair it by
bracket.
following the correct procedure below.
After installing float assem-
b.
( a ) Marvel-Schebler Carburetor. Repair
bly (36), invert body (26).
this as follows:
Check to see that the float
body of float assembly (36) is
1.
Disassemble the carburetor.
centered at right angles to the
machined surface.  Using a
2.
Clean all parts thoroughly. Blow
depth gage, measure the
out all passages with low-pressure
distance from the machined
air.  Do not use a drill or wire to
surface of body (26). with n o
clean out passages.
gasket, to the top side of the
3.
Inspect the tapered end of idle
float body at the highest point.
adjusting needle (22). Make sure
This distance must be 31/32
it is smooth and free of grooves;
1/32 inch.  If the nleasure-
otherwise, replace it.
ment is off by more than 1/16
4.
Replace all gaskets and packings.
inch, replace float assembly
5.
Replace all other parts that show
(36). If it is off by 1/16 inch
signs of wear or damage.
or less, bend the lever arm
6.
Reassemble the carburetor.
4-25

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