Paragraphs 107-110
Fig.
AC48—Model
G
gear type
oil
pump—exploded view, showing
tlJ
Cover.
{2J
Lead
gasker
(3>
Drive
pin, (4J
Driven gear.
(5)
Pump body,
ii)
Driven gear shaft.
(7)
Drive
gear.
Model
G
107,
Gear type pump
Is
mounted
at
rear
of the
engine block
and is
driven
by
the
camshaft. Pump removal
re-
quires removal
of the
engine, clutch
and flywheel.
The cap
screws that
at-
tach
oil
pump
to
cylinder block also
hold
the
assembly together. Check
the
pump
for
gear backlash, which should
not exceed .005. Gear side clearance
should
not
exceed .004. Desired clear-
ance
of the
.4985 gear shaft
in
block
and body bushing
is
.002-.003
and
should
not
exceed
.006.
Renew
the
pump body
if
bushing is worn. The .501
diameter driven gear shaft is
a
press
fit
in pump body.
A
.007 lead gasket (2—
Fig. AC48)
is
placed between pump
body and cover and
a
paper gasket
(8)
is used between pump assembly
and
cylinder block.
The plunger type relief valve
is
located
on the
camshaft side
of the
engine rear mounting flange
as
shown
in
Fig.
AC45. Relief valve spring
should have
a
free length
of 1 15/16
inches. Correct pressure
is 15-20 lbs.
controlled
by
inserting shims between
spring
and
retaining plug.
16
'14
13 12
Fig.
AC48A^Models WC, WD. WD45 and
WF gear type oil pumps. Select gaskets
(14) to obtain 0.003-0.005 clearance be-
tween pump gears and cover.
1.
Helical drive ffear
9.
Screen retainer
2.
Retaining
pin 10. Oil
screen
8. Retainine screw
11.
Cover screw
4 Pump body
12.
Pump cover
B.
Pump shaft
13.
Pump gear
key
6. Thrust collar
14.
Cover ffasket
(Not used
on
WD45)
15.
Pump gear
7. Idler gear shaft
16.
Thrust collar
pin
8. Idler gear
Models WC-WD-WD45-WF
108.
The
gear pump,
Fig.
AC48A,
which
is
driven
by the
camshaft,
is
mounted
on the
underside
of
cylinder
block. Pump removal requires
re-
moval
of
oil pan.
Check
the
pump internal gears
for
backlash which should not exceed .015.
The recommended diametrical clear-
ance between gears
and
pump body
should
not
exceed .008. Select gaskets
(14) between oil pump body and cover
to obtain .003-.005 clearance between
pump gears
and
cover. Renew pump
body and/or shaft
or
both
if
shaft
to
pump body clearance exceeds .008.
The piston type
oil
relief valve
is
located externally
on
right side
of
engine
in the
vicinity
of the oil
level
dip stick.
Oil
pressure
can be
varied
ALLIS-CHALMERS
by adding
or
removing shim washers
between spring
and
retaining plug.
Normal
oil
pressure
is 12 lbs.
CARBURETOR
Non LP-Gas Models
110.
Models
B, C, CA, and RC are
equipped with Zenith model 61AJ7
or
model 161J7 carburetor. The
G
tractor
comes equipped with
a
Marvel-Scheb-
ler TSV-13 carburetor. Models
WC,
WD,
and WF are equipped with Zenith
model 61AX7
or 161X7 or
Marvel-
Schebler model TSX159 carburetor.
Model WD45
is
equipped with
a Mar-
vel-Schebler TSX464
or
TSX561
car-
buretor.
Float setting
for
Marvel-Schebler
carburetor
is
9/32 inch measured from
nearest face
of
float
to
bowl cover
gasket;
for the
Zenith carburetor,
it is
1
5/32
inch measured from farthest
face
of
float
to
bowl cover gasket.
Turning
the
idle mixture screw
to-
wards
its
seat richens
the
mixture.
Turning
the
power adjusting needle
towards
its
seat leans the mixture. Idle
speed stop screw should
be
adjusted
to permit
the
engine
to
idle
at
475-500
rpm.
Zenith carburetor outline numbers
are
not
known
and it
will
be
neces-
sary
to
refer
to
parts catalogs
for
cali-
bration data. Marvel-Schebler cali-
bration data
are as
follows:
TSV-13
Repair
kit
286-834
Gasket
set
16-656
Inlet needle
and
seat 233-570
Nozzle 47-293
Power
jet
49-505
TSX-159
Repair
kit
286-685
Gasket
set
16-592
Inlet needle
and
seat 233-536
Idle
jet or
tube 49-lOlL
Nozzle 47-303
Power
jet
49-208
TSX-464
Repair
kit
286-1037
Gasket
set
16-654
Inlet needle
and
seat 233-543
Idle
jet or
tube 49-lOlL
Nozzle 47-343
Power
jet
49-364
TSX-561
Repair
kit
286-1037
Gasket
set
16-683
Inlet needle
and
seat 233-543
Idle
jet or
tube 49-lOlL
Nozzle 47-343
Power
jet
49-364
24
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