S&S Cycle Super Stock and Special Application Crankcases for 1936-99 Big Twin Engines - Manual (Page 12)

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6- Circuit Breaker Drive Gear and Idler Gear Shafts
S&S® ships generator style crankcase kits with circuit breaker drive gear and idler gear shafts pressed and bolted in place. Installation is performed
at S&S using a special fixture to insure proper alignment with gearcover. Care must be taken to avoid hitting these shafts during handling and
assembly. Prior to installation of flywheel assembly in crankcases, it is recommended that gear cover to be used be slipped over shafts and dowel
pins to check fit. (See Section 7-I, Gearcover). Cover must not be forced on. If resistance is encountered, stop immediately and determine cause.
Properly fit gear cover should slide over shafts and pins without difficulty.
Incorrect gear cover fit may cause abnormal stress between gears, gear shafts, pinion shaft and/or camshaft resulting in rapid wear and/
or failure of these components.
7- General Assembly Information
NOTES
All S&S crankcase oil pump, tappet guide and gear cover mounting holes are 1⁄4-20 thread. Correct hardware is readily available from most local sources.
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Early 1⁄4-24 fasteners used in stock crankcase up to 1978 must not be used in S&S crankcase. Damage to cases caused by improper bolts, screws, etc. is
not covered under warranty.
To help prevent thread damage, S&S recommends use of anti-seize compound on threads of any steel bolt or fitting installed in aluminum.
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S&S recommends high temp resistant RTV® premium silicone, ThreeBond® 1104 or Hylomar® sealant to seal crankcase halves, according to builder’s
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preference. Use any sealant sparingly to prevent excess material from entering crankcase and obstructing passages or contaminating engine oil.
Use of hardware with incorrect threads will damage crankcases.
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Contaminants in engine oil may block oil passages resulting in damage to critical engine components.
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A- Crankcase bolt torque specifications (See “S&S Crankcase Stud Locations” diagram near line drawing for positions).
1- Position A (1⁄4”): 12 ft. lbs.
2- Positions B to H (5⁄16”): 15-18 ft. lbs.
B- Other crankcase fastener torque specifications
1- Tappet guide fasteners: 8-10 ft-lbs.
2- Oil pump mounting bolts: 8-10 ft-lbs.
3- Gear cover screws: 8-10 ft-lbs.
C- Pinion shaft main bearing fit - Generally, fitment specifications are identical to stock but type of service must be taken into consideration.
Bearings in street engines that will receive adequate break-in may be fit on tight side of range to provide longer engine life. Competition
engines that will receive little or no break-in should have bearings fit on looser side of range to avoid seizure. All styles of main bearings
used from 1958 to present may be used in S&S® cases. For simplicity’s sake, only 1987 and later style bearing fitment will be covered in these
instructions. If 1958 to 1986 style bearings are used, consult Harley-Davidson® service manual for correct fitment procedure.
NOTES
Refer to information tag on crankcases for final honed size of pinion shaft main bearing race.
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S&S pinion shaft main bearing fitting Charts 1 and 2 (next page) use Harley-Davidson® bearing color codes.
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All measurements must be taken with parts at room temperature, approximately 70° F.
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Whatever style bearing is chosen, care must be taken to position entire roller surface to completely contact main bearing race and be completely
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contained within race.
Improperly supported main bearings may result in abnormal wear, bearing failure and/or damage to other internal engine components.
1987 and later style pinion main bearings
1- Fitment method A - Use Chart 1 on next page.
a- Refer to information tag on crankcases to determine final honed size of inside diameter of pinion shaft main bearing race.
b- Measure pinion shaft bearing surface diameter.
c- Cross reference pinion race inside diameter with pinion shaft bearing surface outside diameter to determine correct color code.
EXAMPLE: Pinion shaft bearing surface diameter measures 1.2499” and is between 1.2498 and 1.2500 in left “Pinion Shaft Bearing Diameter” column.
Pinion bearing race inside diameter is 1.7510” and falls between 1.7509 and 1.7511 in middle “Bearing Race Diameter” column. Correct bearing color
code where two columns intersect is “BLUE”.
CAUTION
CAUTION
CAUTION