S&S Cycle Bore 4 1⁄8 V-Series Engines - Manual (Page 7)

INSTALL BREATHER GEAR, CAMSHAFT, AND GEAR COVER
1. Thoroughly clean and dry all parts including camshaft
lockwasher and thrust washer. Carefully inspect breather
gear for burrs and remove as necessary. Inspect edges of
crankshaft breather “window” for burrs and smoothness.
Cam thrust washer and breather gear shims should be
correct size, but endplay of camshaft and breather gear must
be verified by customer.
a. Breather gear end-play should be between .005” -
.015”. Install breather gear with supplied spacer into
the breather bore of the gearcase. With a new,
uncrushed gasket installed on the gearcase, use a
straight-edge and measure the distance to the spacer.
Subtract .006”-.007” for gasket crush, and this will be
the breather gear end-play. Select correct thrust washer
to achieve proper end-play.
b. Camshaft end-play should be .005” - .015”. Install
camshaft, with lockwasher and thrust washer, into cam
bearing. Install gearcase cover with new gasket and
tighten all fasteners to 120 in-lbs. Measure camshaft
end-play with a feeler gauge or dial indicator at four
different positions of crankshaft rotation. Select correct
thrust washer to achieve proper end-play.
2. Apply light coat of assembly lube to cam bearing, camshaft
lockwasher, thrust washer, breather gear, and to breather
gear cavity inside engine, and coat of motor oil to cam lobes.
3. Place camshaft lockwasher in case with ears down and flat
edge towards rear of engine. See Picture 16.
4. Install thrust washer over end of cam and place assembly in
engine. During installation, rotate engine so marks on cam
gear and pinion gear align. Second mark on cam gear must
be at eight o’clock position.
5. Install breather gear and shim, aligning breather gear timing
mark with mark at eight o’clock on cam gear. See Picture 17.
7. Use connecting rods to rotate flywheels and insure gears
rotate freely. Apply assembly lube to ends of shafts and
meshing surfaces of gears and remove excess.
8. Apply assembly lube to gear cover bushings.
9. Install gasket and cover and tighten screws to 120 in-lbs.
NOTE - Gear cover should slide smoothly over alignment dowels
and must not be forced. Confirm that gasket material does not
overlap oil passages in crankcase and gear cover. See Picture 18.
Having to force gear cover indicates an alignment problem.
Problem must be identified and corrected before operating
engine. Operating engine with forced gear cover could result
in broken pinion shaft or other engine damage.
10. Rotate flywheels to check for binding. If present, cause of
bind must be determined and corrected. If assembly rotates
freely, pour approximately four ounces of oil into gear
compartment after allowing crankcase sealant to cure per
manufacturer’s instructions.
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Picture 15 Picture 16
Picture 17 Picture 18
CAUTION