Manual

12
6- Circuit Breaker Drive Gear and Idler Gear Shafts





Incorrect gear cover t 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 ¼-20 thread. Correct hardware is readily available from most local sources.

Early ¼-24 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 tting installed in aluminum.

S&S recommends high temp resistant RTV® premium silicone, ThreeBond® 1104 or Hylomar® sealant to seal crankcase halves, according to builder’s 
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.

Contaminants in engine oil may block oil passages resulting in damage to critical engine components. 
 
 
 
 
 
 
 
 




NOTES
Refer to information tag on crankcases for nal honed size of pinion shaft main bearing race.

S&S pinion shaft main bearing tting Charts 1 and 2 (next page) use Harley-Davidson® bearing color codes. 
All measurements must be taken with parts at room temperature, approximately 70° F. 
Whatever style bearing is chosen, care must be taken to position entire roller surface to completely contact main bearing race and be completely 
contained within race.
Improperly supported main bearings may result in abnormal wear, bearing failure and/or damage to other internal engine components.
 
 Use Chart 1 on next page.
 
 
 
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