ALLIS-CHALMERS
Paragraphs 117-120
Fig.
AC52D—Model G timing gear end of
engine (1) Governor bumper spring ad-
lusting screw, (2) Ignition timing mark,
and (3) Carburetor rod.
Fig.
AC52E—Showing components parts of
the Model G governor. Governor weight
assembly (6) is accessible after removing
timing gear cover.
1.
Control spring
8. Carhuretor rod
4.
Weight
6. Roller bearing
6. Weight assembly
7.
Thrust cup Jk shaft
8. Thrust arm
9. Bumper spring
10.
Bumper screw
11.
Snap ring
12.
Washer
13.
Seal
14.
Shaft & lever
16.
Ball joint
in front face of bushing registered
with notches in face of cylinder block.
Be sure oil drain hole connecting igni-
tion unit side of bracket to timing gear
case is open. When reinstalling the
magneto, or battery ignition unit it
should be timed as outlined in para-
graph 140 or 140A.
Model G
117.
ADJUSTMENT. With engine
running at high idle, turn bumper
spring adjusting screw (1—Fig. AC
52D) in until surge is just eliminated.
Linkage adjustment consists of mak-
ing sure that the system operates
freely and that carburetor link rod
(3) is long enough to put a slight pre-
load on the governor arm when hand
throttle and carburetor are in wide
open position. This is done by adjust-
ing rod (3) to a length 1/32 inch
longer than required to connect its
two attaching levers when the latter
are in the wide open position.
Engine High Idle Speed. . .2100 rpm
Engine Loaded Speed 1800 rpm
118.
R&R AND OVERHAUL. To re-
move the governor unit, it is necessary
to first remove the timing gear cover.
The weights assembly can then be re-
moved by taking out the four screws
which retain it to the cam gear. The
governor thrust cup shaft has a .002-
.004 clearance in the camshaft. It
should be renewed if this clearance
exceeds .008 or if cup is worn at the
weight contact surface. The weight
assembly should be renewed if the
hinge pins are worn more than .006.
Caution: Check the vent hole located
behind number one camshaft journal
and drilled to the thrust cup shaft
bore. If this hole becomes plugged, the
governor will not operate correctly.
The shaft lever located in the timing
gear cover can be removed by extract-
ing the snap ring and driving the tap-
ered Groov pin out of the lever.
Models WC-WD.WD45-WF
119.
ADJUSTMENT. Adjust engine
speed by shortening or lengthening
control rod (5—Fig. AC52F) by using
set screw (4). To adjust linkage fol-
low procedure in paragraph 115.
Engine High Idle
(WC-WF) 1575 rpm
Engine High Idle
(WD-WD45) 1720 rpm
Engine Speed Loaded
(WC-WF) ., 1300 rpm
Engine Speed Loaded
(WD-WD45) 1400 rpm
120.
OVERHAUL. To remove gover-
nor weights unit, remove two nuts and
cap screw which retain magneto or
distributor bracket to engine and with-
draw bracket and shaft gear and
weights assembly as a single unit. The
weights and trust bearing can be re-
newed at this time.
If shaft, gear, or bushings require
attention, the shaft should be removed
by bumping out the drive pin (28—
Fig. AC52G) on magneto equipped
models or remove distributor unit
drive gear on battery ignition models.
When bumping out the pin, be sure to
prevent bending of shaft by bucking
up same with a length of pipe intro-
duced through the opening in the bot-
tom of the magneto drive bracket.
On the WD, WC and WF gear (17)
is sold only with the shaft assembled,
not separately. To avoid damage to the
shaft when removing the gear, cool the
shaft while heating the gear. Shaft
should have .002 running clearance in
bushings.
It will be necessary to remove the
timing gear cover if the governor
throttle shaft and cross shaft are to be
overhauled. With cover removed, check
cross shaft bushings and, if necessary,
renew same. Check governor lever
spring eye holes jind contact surfaces.
Fig.
AC52F--Models WC, WD. and WF engine governor iinicage installation. Engine speed
adiustment is made at pomt (4) by increasing or decreasing iengtfi of rod (5) Goveiior
linkage on WD and WD45 with battery ignition is similar.
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