CRANKSHAFTS & CAM GEARS
Installing
INSTALL CRANKSHAFT AND CAM GEAR
Aluminum Alloy Engines - Plain Bearing
In aluminum alloy models the tappets are inserted first,
the crankshaft next, and then the cam gear. When
inserting the cam gear, turn the crankshaft and cam gear
so that the timing marks on the gears align. Fig. 14.
NOTE: Model series 94000, 171700, 191700, 251700,
and 252700 have a removable timing gear. When
installing timing gear, have inner chamfer toward
crankpin. This assures that timing mark will be visible.
Fig. 14. Aligning Timing Marks
Aluminum Alloy Engines Ball Bearing
On crankshafts with ball bearings, the gear teeth are not
visible for alignment of the timing marks, therefore, the
timing mark is on the counterweight. Fig. 15. On ball
bearing equipped models the tappets are installed first.
The crankshaft and cam gear must be inserted together;
align timing marks as shown in Fig. 15, and insert
crankshaft and cam gear.
Fig. 15. Ball Bearing Engines
CRANKCASE COVER and
CRANKSHAFT END PLAY
All Models
The crankshaft end play on all models, plain and ball
bearing, should be .002" (.05 mm) to .008" (.20 mm).
The method of obtaining the correct end play varies,
however, between cast iron, aluminum, plain and ball
bearing models. New gasket sets include three
crankcase cover or bearing support gaskets -- .005" (.13
mm), .009" (.23 mm) and .015" (.38 mm).
Aluminum Engines Plain Bearing
The end play should be .002" (.05 mm) to .008" (.20 mm)
with one .015" (.38 mm) gasket in place. If the end play
is less than .002" (.05 mm), which would be the case if a
new crankcase or sump cover is used, additional
gaskets of .005" (.13 mm), .009" (.23 mm) or .015" (.38
mm) may be added in various combinations to attain the
proper end play.
If the end play is more than .008" (.20 mm) with one
.015" (.38 mm) gasket in place, a thrust washer is
available and to be placed on the crankshaft power take-
off end, between the gear and crankcase cover or sump.
Additional gaskets .005" (.13 mm) or .009" (.23 mm) will
then have to be added to the .015" (.38 mm) gasket for
proper end play. NOTE: On aluminum models never
use less than .015" (.38 mm) gasket. Fig. 16.
Fig. 16. Correcting Crankshaft End Play
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