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FUEL PUMP SERVICE INSTRUCTIONS
WISCONSIN FUEL PUMPS, No. LP-38E, LP-38H and LP-38F (Cold
Weather:
-65°F)
For all 4 cylinder
engine models
The fuel pump, like all other
parts
of the engine,
is sub-
ject
to wear and you will find that any time after
500 hours
of use, its
efficiency
will gradually
decrease.
This is in-
dicated
by the engines
faltering
at high speeds
or when
heavy loads
are suddenly
applied.
The pump can easily
be
restored
to its
normal efficiency
by the installation
of a
repair
kit.
Wisconsin
LQ-46 (for
Lpo38E), LQ-47 (for
LP-38H) or LQ-4&A (LP-38F,
cold weather,
- 65°).
1. Disconnect fuel lines
from pump and remove fuel strain-
er if mounted to pump. Remove fuel
pump from adapter
housing by taking
out the two mounting screws.
2. File
a groove across
a point
at the union of castings
(15 and 16). This is a positive
location
of the fuel
INLET and OUTLET positions
when reassembling.
Re-
move six
head to flange
screws
(3) and remove fuel
head. Take off screw (2),
remove cover (7) and discard
cover gasket (4).
3. Turn fuel
head (16) over and remove both valve assem-
blies
(5),
and gaskets
(6).
Note position
of valves.
4. Clean head thoroughly
with kerosene or diesel
fuel
and
a fine brush.
5. Place
fuel
head (16)
with diaphragm
surface
up. As-
semble new valve
gaskets
(6)
and mount valve assem-
blies
(5) in positions
shown on illustration.
Press
valves in evenly without distortion
and stake in place.
6. Mount new cover gasket
(4),
cover (7) and washer
Securely tighten
in place with cover screw (2).
7. Set fuel
head assembly
aside
and proceed
to rebuild
lower diaphragm section.
8. Insert
the end of a small screw driver into the coils
of
rocker
arm spring
(12) and remove.
9. Hold mounting bracket
(15) in the left
hand, with the
rocker
arm toward your body and the thumb nail
on the
end of link
(10).
With the heel of right
hand on dia-
phragm (1),
compress the diaphragm spring
(11),
and
the same time pull toward your body. Unhook link
(10)
from end of diaphragm and remove.
10. Remove rocker
a,m pin (13).
Note that pin is larger
one end.
Drive
pi~ out
by means of a punch
from
small end.
11. Clean mounting bracket
(15) with kerosene
or diesel
fuel.
12. Assemble new link
(10),
bushing
(9)
and pin (13)
bracket
(15) along with rocker
arm (14).
Stake rocker
arm pin (10) in bracket to keep it in place.
13. 1~lace new diaphragm spring (II)
into bracket
(IS).
peat in reverse
order
paragraph
9, using
a new dia-
phragm (I).
Assemble new rocker
arm spring
(12).
14. Mount this
assembly
to adapter
on engine
using
new
flange gasket (17).
15. Crank the engine over to a position
where the diaphragm
(1) is laying flat
on the mounting bracket
(IS).
Place
the fuelhead
assembly back in position
so the [acating
grooves of Step 2 are in [ine~ and start
the six head
screws approximately
three
turns.
Again crank the en-
gine over to where the diaphragm (1) is pulled down in-
to mounting bracket
(15) to its
lowest position.
Secure-
ly tighten
the six head screws (3).
16. Mount fuel strainer
to fuel inlet
and connect fuel lines.
NOTE: ~ne LQ-46, LQ-47 or LQ-46-A Repair Kit and t~e pa~ts
included there-in~ which m'e identified by ma (*sterlsk (*),
Qre the only parts of the fuel pump a-~uilable for s~rviee.
Ref.
No.
Description
Req.
* 1
DIAPHRAGM
........................................................
2
COVER
SCREW
..................................................
1
3
SCREW, head to bracket mounting ....................
6
* 4
GASKET, cover (pulsator in LQ-47) ................
1
* 5 VALVE ASSEMBLY
............................................
2
* 6
GASKET
for valve ..............................................
2
7
COVER
..................................................................
I
8
WASHER
for cover screw ..................................
|
* 9
BUSHING
for rocker arm pin ..............................
1
"10
LINK for rocker arm ............................................
1
"11 SPRING
for diaphragm
........................................
"12 SPRING
for rocker arm ......................................
I
"13
PIN for rocker arm ..............................................
|
14
ROCKER
ARM ....................................................
15
MOUNTING
BRACKET
......................................
1
16
FUEL HEAD
........................................................
1
"17 GASKET
for mounting flange ............................
1
30
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