ALLIS-CHALMERS
tering of the new seal to the crank-
shaft.
On model G, the inner flange ring
element of the inner leather seal
should be installed with the lip near-
est the timing gears. Oil the leather
and the outer felt elements before in-
stalling them. On B, C, CA, and RC,
front face of oil seal should extend
about V8 inch beyond the front of the
timing gear cover. Latest seals are of
felt faced with neoprene.
FLYWHEEL
103.
On G, RC, WC, WD, WD4S, and
WF,
R&R of fiywheel requires remov-
al of engine as outlined in paragraphs
62,63
&
64.
On
B,C,& CA,
flywheel
may
be removed after detaching (splitting)
the clutch housing from the engine.
Flywheels used on models WD and
WD4S equipped with a Rockford
clutch are not interchangeable with
the same models equipped with an
Auburn clutch.
The starter ring gear can be re-
newed after detaching (splitting) the
clutch housing from the engine with-
out removing the flywheel from the
crankshaft except on model G, which
requires removal of flywheel from
shaft. Reason for this is that on the
model G, the ring gear must be in-
stalled to front edge rather than rear
edge of flywheel. On model G, the
bevel end of ring gear teeth ^ould
face toward the timing gears; on the
others, the beveled teeth face rear-
ward. However, the latest ring gears
for B, C, and CA have straight teeth
and can be installed either way.
On WD & WD4S with starter motor
installed, distance from starter pinion
to ring gear should be not more than
VA
inch. If greater than ^4 use either
the later wider ring gear or relocate
the starting motor locating hole in
engine clutch housing.
FLYWHEEL TIMING MARKS
Models WD-WD45
104.
Model
WD
flywheel carries only
the magneto ninning timing mark "F",
which is 30 deg. or 3y8 inches before
top center and is stamped on the fly-
wheel rear face. To determine and
position number one cylinder on top
center, refer to Fig. AC46. Model
WD4S flywheels are similarly marked
with a running timing mark of
**F"
or
"Fire" in addition to a "DC" mark.
Flywheel marks are viewed through
an inspection port located in clutch
housing bottom cover.
Paragraphs 103-106
16
U 13 12 11
Fig.
AC47—Models B, C, CA. and RC vane type oil pump which is mounted on rear face
of engine block, and is driven by the camshaft. Install rotor blades so that the bevel edge
faces toward direction of travel (anti-clockwise from drive end).
7.
Oil inlet pipe
8. Rotor hlade spring
9. Pump cover
10,
Cover screw
11,
Pump gasket
12,
Relief valve ball
1.
Pump shaft
2.
Pump body
3.
Cover gasket
4.
Retaining cap screw
5.
Oil outlet pipe
6. Rotor blade (2)
Fig.
AC47A — Models B. C.
CA. and RC vane type pump
^-exploded view. Install rotor
blades so that the bevel edge
faces toward direction of
travel (anti-clockwise
drive end).
1.
Pump shaft
2.
Pump body
3.
Cover gasket
6. Rotor blade (2)
7.
Oil inlet pipe
8. Rotor blade spring
9. Pump cover
11.
Pump gasket
12.
Relief valve ball
13.
Relief valve spring
14.
Relief valve retaining pin
15.
Inlet screen
OIL PAN (SUMP)
All Models
lOS.
Method of removing the pan on
all but WC-WD-WD45-WF is self evi-
dent, however some B-C-CA-RC en-
gines have slightly longer cap screws
Installed at rear end of both sides of
pan.
Be sure these are installed in the
correct location as they are used when
the crankshaft rear oil seal retainer
does not have steel inserts.
On WC-WD-WD45-WF it is neces-
sary to remove engine front support
and flywheel cover to provide assem-
bling clearance at front end of pan.
On these models make sure that cor-
ners of pan at each end of arch gasket
are square and not depressed. If latter
condition exists oil leakage may occur
unless low spots are built up with
solder or other suitable flller material.
13.
Relief valve spring
14.
Relief valve retain-
ing pin
15.
Driving pin
16.
Central oil passage
in camshaft
OIL PUMP AND RELIEF VALVE
Models B-C-CA-RC
106.
Oil pump can be removed after
removing flywheel, by removing cap
screws (4—Fig. AC47) retaining pump
to rear surface of cylinder block. Free
length of rotor blade springs should be
1 S/32 inches, and each should exert
a pressure of 8-l6 ounces when com-
pressed to a length of % inch. Rotor
blades must be installed with bevel
edge of blade toward direction of
travel. Select gaskets (3) to obtain
,001-,003 inch end play in rotor. If .004
inch end play is present with only one
gasket installed, lap rear surface of
pump body to reduce clearance.
The pressure relief valve is part of
the rotor shaft unit and can be re-
moved after driving out the retaining
pin (14). Free length of valve spring
should be lVs inches and it should
exert a pressure of 16-18 ounces when
compressed to a length of
Vz
inch.
23
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