ALLIS-CHALMERS
Paragraphs 82-85
To remove timing gear cover, first
remove hood and radiator. Remove
starting crank extension pin and
loosen extension bracket. Loosen set
screw retaining pulley to crankshaft
and remove pulley. Disconnect throttle
and governor linkage. Block up front
end of engine and remove engine sup-
port. On RC, the front-center oil pan
stud may be welded to the angle iron
on timing gear cover; in which case it
will be necessary to remove the oil
pan. On WC, WD, WD45 & WF, it is
not necessary to remove oil pan, but
removal is recommended as a means
of protecting against subsequent oil
leaks where pan joins the bottom face
of gear cover. Remove timing gear
cover retaining cap screws and timing
gear cover.
Refer to GOVERNOR section for
overhaul of linkage.
Adjust camshaft end play after tim-
ing gear cover is installed by loosen-
ing thrust screw locknut (located on
front face of cover) and turning thrust
screw in until it contacts end of cam-
shaft; then back the screw out ^ to
% turn.
TIMING GEARS
Models B-C-CA-RC
82.
Camshaft gear is a press fit and
keyed on the camshaft and should be
removed, with the camshaft as a single
unit. For camshaft removal procedure,
refer to paragraph 85. Press new gear
on until rear surface of gear hub is
flush with front surface of camshaft
front journal. Crank gear installation
can be facilitated by a mild application
of heat on the gear. For replacement
of governor and magneto or distribu-
tor gear, refer to Governor, paragraph
116.
Model G
83.
The drive consists of two helical
gears.
To remove the camshaft gear,
first remove the timing gear cover as
outlined in a preceding paragraph, and
Fig, AC33—Model 6. /Method of removing camshaft gear using two Va inch cap screws
and a suitable
puller.
Shaft
should
be bucked-up when reinstalling gear to shaft.
also remove the governor weight as-
sembly from end of gear. Remove
cam gear from shaft with a puller and
two % inch cap screws as shown in
Fig. AC33. Crankshaft gear can be re-
moved with a suitable puller. When
installing gears, remove oil pan or dis-
tributor and buck-up the camshaft at
one of the lobes near front end of
shaft with a heavy bar. Mesh the sin-
gle mark on the crank gear between
the double mark on the cam gear.
Models WC-WD-WD45-WF
84.
Timing drive consists of three
helical cut gears which includes the
governor gear (drive for both gover-
nor and magneto). On WC, WD, WF
and WD4S prior Eng. Ser. No. 45-
48556 gear is attached to shaft by cap
screws, and can be removed after re-
moving the timing gear cover. The
cap screw holes in the camshaft gear
are unevenly spaced, permitting the
gear to be installed to the camshaft
in only one position. On later WD4S
tractors, gear is pressed on the shaft.
Crankshaft gear is a press fit on the
crankshaft, but can be removed when
timing gear cover is off, by using a
suitable puller. Reinstallation of this
MACHINED SURFACE TOP OF HEAD
/ X FLUSH
NEW STYLE HEAD VALVE GUIDE INSTALLATION
Fig,
ACa2—Valve guide installation on WD engines after serial W 289000 and WD45,
Inlet valve guides are installed so that the top end of the guide is Va inch below the
machined surface as shown. Exhaust valve guides are installed so that the top end is
flush with the machined surface.
gear can be facilitated by heating
same in water or oil.
When reinstalling gears, mesh the
single marked crankshaft gear tooth
with a similar double mark on the
camshaft gear. Refer to GOVERNOR
section for governor and magneto or
distributor drive gear data.
CAMSHAFT AND BUSHINGS
Models B-C-CA-RC
8S.
To remove camshaft^ remove
timing gear cover and oil pan. Remove
cylinder head cover, rocker arm.s as-
sembly and push rods. Hold tappets
up to clear cams and withdraw cam-
shaft and gear as a unit.
On RC, the steering gear pedestal
or front support unit interferes, and
must be removed to enable camshaft
to be withdrawn. When reinstalling
camshaft, be certain that oil passage
(8—Fig. AC34) is clean. Oil passage
in hollow camshaft delivers oil to
crankshaft main bearings via the cam-
shaft bushings, to the connecting rods
and cylinders by throw holes (&) and
to the timing gears through flutes in
thrust plunger (11). Be sure thrust
plunger operates freely in camshaft
and that oil pump drive pin (6) is
secured in camshaft.
Clearance between new camshaft
and new camshaft bushings should be
.002-.004 inch. Renew camshaft bush-
ings or camshaft or both, if clearance
exceeds .007 inch.
Bushings are supplied in Standard
size and undersize of 0.002S. To renew
camshaft bushings after camshaft has
been removed, it is necessary to re-
move the flywheel and oil pump which
necessitates engine removal.
The bushings can be driven out of
block and new ones driven in. Drive
rear bushing in from the front until
rear edge of bushing is
VA
inch from
17
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