Paragraphs 66-70
bolts.
Engine and clutch housing unit
may now be removed by pulling same
rearward to unmesh clutch shaft gear
from mainshaft intermediate gear.
CYLINDER HEAD
All Except Model G
66.
To remove cylinder head, re-
move hood and drain cooling system.
Remove cylinder head cover (rocker
lever cover) and rocker arms assem-
bly. Unbolt carburetor from manifold
and allow same to hang on air filter
hose.
Disconnect water outlet con-
nection and oil connection to cylinder
head. Remove cylinder head cap
screws or nuts (also remove water
manifold on WC, WD, WD45 and WF)
and lift off head. When reinstall-
ing, tighten head nuts or cap screws
progressively and from the center out-
ward. Retighten after engine has
reached operating temperature. Tight-
en models B, C, CA, and RC cap screws
to 60 foot pounds torque. Tighten mod-
els WC, WD, WD4S and WF V2 inch
studs to 70 foot pounds and % inch
studs to 2S foot pounds torque.
Model G
67.
To remove cylinder head, first
remove hood and support, and drain
cooling system. Remove carburetor
air intake, air cleaner, instrument
panel, fan assembly, spark plug wire
bracket, and upper radiator hose. Re-
move cylinder head retaining cap
screws and nuts and lift off head.
When reinstalling, tighten head
nuts progressively and from the cen-
ter outward. Retighten after engine
has reached operating temperature.
Tighten the % inch cap screws to S3-
S7 ft. lbs. torque.
VALVES AND VALVE SEATS
All Except Model G
68.
On B, C, and RC tappets should
be set hot to .010 for inlet and ex-
Flg.
AC23-WD engines after engine serial
299173, and engines 262650 through 263-
224 and WD4S are factory equipped with
kotocap positive type valve rotators for
the exhaust valves, kotators are also
available for service on the WC and WF
engines.
haust valves. On CA, WC, WD, WD-
45 and WF tappets should be set hot
to .012 for both inlet and exhaust.
Inlet valves with a slightly larger
head than exhaust valves seat directly
in the cylinder head. However, inlet
valve seats inserts are available for
service. Oversize exhaust valve seat
inserts are available for insert re-
newal. Both inlet and exhaust valves
have a face and seat angle of 4S de-
grees.
Desired seat width is 1/16 inch.
Seats can be narrowed, using 30 degree
and 60 degree cutters.
Engines in WD & WD4S after en-
gine 299173 and engines 262650
through 263224, are factory equipped
with Rotocap positive type valve ro-
tators for the exhaust valves. Fig.
AC23.
These rotators are also avail-
able for service on the WC and WF
engines. They require no maintenance
but should be visually observed when
engine is running to make sure that
each exhaust valve rotates slightly.
Renew the rotator element of any
exhaust valve which fails to rotate.
Model G
69.
Tappets should be set cold .012
inlet, and exhaust. Inlet and exhaust
valves are not interchangeable. Inlet
valves have round pin type spring
locks while the exhaust valves, which
are provided with Roto-valve release
type rotators, have split cone type
locks.
All valves seat directly in the
cylinder block and have face and seat
angles of 45 degrees. Desired seat
width is 3/64 inch—recut if wider than
1/16 inch. Seats may be narrowed, us-
ing IS degree and 75 degree cutters.
A gap or end clearance of not less
than .001 and not more than .006 be-
tween end of exhaust valve stem and
bottom of Roto-valve cup should exist
when valve is on its seat. Refer to
Figs.
AC24 and AC2S.
ALLIS-CHALMERS
VALVE GUIDES
All Except Model G
70.
The cast iron presized shoulder-
less valve guides are pressed into the
cylinder head with a piloted drift until
scribe line mark on guide is fiush with
machined surface of valve spring seat.
Refer to Fig. AC32, for WD & WD4S
installation. Inlet guides are 7/32 inch
Fig.
AC2S—A
gap or end clearance (O), of
.001-.006 should exist in a koto-valve in'
stallation when the valve Is on Its
seat.
Fig, AC24—G tractor engine (N62 Confl-
nental) exhaust valves are provided with
koto-valve release type rotators.
Fig, AC26—Models B, C, CA, and RC engine
valve system—end
view*
14
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