Paragraph 143C
radiator. Remove retaining pin from
steering shaft universal joint and slide
steering shaft rearward. Support trac-
tor and slide front support forward as
described in paragraph 141A. Remove
fan belt and crankshaft pulley. Un-
bolt engine front support (S — Fig.
AC56B) from side channels, loosen
clamp bolt (CB) and remove bracket
(B).
Remove the cap screws from the
front of the timing gear cover and the
three retaining cap screws from the
injection pump mounting flange (in-
jection pump will stay in place) and
withdraw timing gear cover from
front of engine.
The crankshaft front oil seal (8—
Fig. AC56A) which is retained in the
crankcase front cover can be renewed
at this time. The spring loaded oil
seal should be installed with lip of
same facing inward toward timing
gears.
Reinstall the crankcase front cover
by reversing the removal procedure
and make certain that copper wash-
ers (4) are installed on the bottom
three cover retaining cap screws.
TIMING GEARS
143C.
The camshaft gear and/or
crankshaft gear can be removed with-
out removing their respective shafts
from the engine. To remove the gears,
it is necessary to use a suitable puller
after the crankcase front cover has
been removed as outlined in para-
graph 143B.
Before removing either of the gears,
check the gear backlash which should
be 0.001-0.003. If the backlash ex-
ceeds 0.007, either one or both gears
Fig.
AC56B — Front support (S) and
bracket (B) can be removed together.
ALLIS-CHALMERS
should be renewed. Before removing
the camshaft gear and after removing
the camshaft thrust plate retaining
cap screws as shown in Fig. AC57,
check the camshaft end play by in-
serting a feeler gage between the rear
face of the camshaft thrust plate and
the front face of the camshaft front
bearing journal, as shown in Fig. AC-
57B.
The thickness of the feeler gage
that can be inserted represents the
camshaft end play which should be
0.003-0.008. If the camshaft end play
is excessive (more than 0.014), and a
new thrust plate will not correct the
condition, it will be necessary to re-
new the camshaft gear and recheck
the end play; or, if the same gear is
to be used, it will be necessary to file
the required amount from the rear
face of the gear hub as shown in Fig.
AC57A. For example, if the measured
end play is 0.015; file at least 0.007
from the gear hub so as to bring the
end clearance within the suggested
limits.
Timing gears are marked with a let-
ter *'S" if the gears are standard size;
or, the gears are marked with a num-
ber within either an "O" or a letter
*'U".
The letter "O" indicates an over-
size gear and the letter "U" indicates
Fig.
AC56—The single punch marked tooth
space on the camshaft gear should be
meshed with fhe single punch marked tooth
on the crankshaft gear as shown at (X).
Fig.
AC57—Removing the camshaft thrust
plate retaining cap screws.
Fig.
AC57B — Checking the camshaft end
play. The amount of end ploy is equal to
the thickness of the feeler gage that can
be inserted between the shaft journal and
the thrust plate.
fc«^^2
Fig.
AC56A—Timing gear
cover and associated
parts.
B.
Engine front support bracket
5.
Timing gear cover
8. Oil seal
10.
Engine front plate
Fiq AC57A Excessive camshaft end play can be corrected
bv filina the required amount of metal from rear face of the
camshaft gear hub. Refer to text.
38
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