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Jacques
Lacasse
 
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Wisconsin S-10D, S-12D,
S-14D
Wisconsin
Engines
Instruction
Book and Parts List
Back issue MM-304
Page 19
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Fig. 22 -
293052C
In
reassembly; when attaching air cleaner bracket to flange, on carburetor
air horn, use new gasket and tighten the three mounting screws to
34 inch lbs. torque (minimum).
STARTER
SHEAVE and FLYWHEEL SHROUD (Fig. 23)
Remove starter sheave and screen by
taking out the three screws and washers that mount to the flywheel.
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Fig.
23
Fig.
24
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Take
off top cover and cylinder side shroud.
Unhook governor spring and remove four screws holding flywheel shroud
to back plate. Flywheel shroud can then be removed.
Back plate can be taken off, only if necessary, after flywheel is
removed.
CYLINDER
HEAD and SPARK PLUG (Fig. 24)
Remove spark plug and take out the three cylinder head studs and
five capscrews. After removal of cylinder head and gasket, clean
out all carbon deposits from combustion chamber and dirt from between
cooling fins.
In
reassembly, use new cylinder head and spark plug gaskets. Note:
Internal contour of cylinder head gaskets at inlet and exhaust valves
are not the same. Mount gasket to cylinder block with the larger
internal radius located at the inlet valve. See Fig. 24.
Apply
a mixture of graphite and oil to the threads of the cylinder head
studs and capscrews. Torque to 32 ft. lbs. in three
alternate stages: 16 ft. lbs., 24 ft. lbs. and finally 32 ft. lbs.
Leave
spark plug off temporarily, for ease in turning engine over for
remainder of assembly and for timing adjustments. When mounting
spark plug; tighten 28 to 30 ft. lbs. torque.
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Fig.
23 |
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VALVES
and SEAT INSERTS (Fig's. 25, 26, 27) Take off the combination
valve inspection cover and breather assembly. By means of a standard
automotive valve lifter, remove retainer locks and take out valves
from top of cylinder block.
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Fig.
26
SPECIFICATIONS ARE FOR BOTH INLET AND EXHAUST
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Fig.
28
After
grinding, lap valves in place until a uniform ring will show entirely
around the face of the valve. Clean valves, and wash block thoroughly
with a hot solution of soap and water. Wipe cylinder walls with
clean lint free rags and light engine oil, especially if honing
operation was also performed.
VALVE
GUIDES (Fig. 28)
When valve stem clearance becomes excessive, the valve guides
should be driven out, as illustrated in Fig. 28, and new guides
pressed in place. Use Wisconsin Motor DF- 72 valve guide
driver. In reassembly, press guides into valve ports using the
same driver tool. Refer to Fig. 27 for clearance specifications
and proper assembly.
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| A
- VALVE FACE ANGLE |
45°
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| B
- SEAT INSERT ANGLE |
45°
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| C
- GUIDE INSIDE DIAMETER |
.312
- .313
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| D
- VALVE STEM DIAMETER |
Inlet.
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.310
- .311
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Exh.
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.308
- .309
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MAXIMUM ALLOWABLE
CLEARANCE BETWEEN C AND D
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IN. |
.005
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| EXH. |
.007
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Fig.
27
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FLYWHEEL
(Fig's. 29 and 30)
Caution: If flywheel is to be removed it must be loosened
at this time. Do not attempt to loosen flywheel after
gear cover is removed. Striking the crankshaft, without support
from gear cover, would inflict damages to the crankshaft, rod and
piston.
Straighten tab
of star lockwasher that is bent over on flat of flywheel nut. Place
a 1-11/16" box or socket wrench on to flywheel nut and give the
wrench a sharp blow with a soft hammer. Do not remove nut,
simply unscrew it flush with end of shaft.
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Clean out carbon and gum deposits from the valves, seats, ports
and guides. Replace valves that are badly burned, pitted or warped.
The
exhaust valve face and exhaust seat insert
are of stellite material. A positive type valve
rotator is furnished as standard equipment on the exhaust
valve only. Clean and inspect operation of rotator.
The
inlet and exhaust seat inserts can be removed, when
replacement becomes necessary, by means of Wisconsin Motor DF-66-A
insert puller. See Fig. 26.
Grinding
of valves and seats should be done by an authorized
Wisconsin service station. See directory in rear of manual.
Before
grinding valves, inspect valve guides for possible replacement.
Refer to Fig. 28 for proper MI-1116 Fig. 28 293045C method of driving
out guides, and see chart, Fig. 27, for valve, seat and guide specifications.
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The
flywheel is mounted to a taper on the crankshaft. Take a firm hold
on the flywheel fins, pull outward and at the same time strike the
end of the crankshaft with a babbitt hammer. The flywheel will slide
off the taper of the crankshaft. Do not use a hard hammer as it
may ruin the crankshaft and bearings. Loosen flywheel but do not
remove: It is necessary that the flywheel be left on to support
crankshaft during removal of gear cover and connecting rod, and
prevent damaging oil seal in stator plate. Take flywheel off after
piston and connecting rod are removed.
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MI-1116
Index
Page
21-22
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