S&S Cycle Super Stock and Special Application Crankcases for 1936-99 Big Twin Engines - Manual (Page 17)

17
9- Frame
S&S® crankcase installation in frame/chassis is essentially the same as stock, although additional clearancing and shimming may occasionally be
required. Main areas of concern are between cases and frame motor mounts and, in 1965 to 1969 engines, between cases and primary chain cover.
A- Crankcase to frame motor mount clearance - Checking clearance around and between case mounting bosses and frame is necessary to
ensure that crankcase rests squarely on motor mount pad and no stress is applied to crankcases when mounting bolts are tightened.
Shimming may be required to compensate for variances between frames.
NOTE : Crankcases damaged by improper installation are not covered under warranty.
Improper alignment of engine and frame mounts may cause abnormal stresses resulting in damage to crankcases or other parts.
To check clearance perform following steps:
1- Assemble case halves using several case alignment studs and several regular case bolts. Snug nuts and bolts. Torquing bolts to final
specification is not necessary.
2- Clean frame engine mounts and carefully remove any irregularities from mounting surfaces. Also inspect crankcase mounting bosses for
burrs.
3- Position case assembly in frame.
4- Install engine mounting bolts in motor mounts, and check clearance between mounting bosses on cases and frame and any other areas
where frame and cases may contact each other. Bolts may be difficult to install if contact is severe.
5- If cases contact frame, remove them and relieve just enough material in offending area to provide clearance.
6- Place cases in frame, install one rear mounting bolt and snug nut.
7- Measure gap between crankcase mounting bosses and frame motor mounts with feeler gauge to determine if shimming is required.
8- If gap exists, fabricate shim just thick enough to fill gap.
9- Install opposite corner shim and mounting bolt and nut, and tighten identical to other bolt.
10- Check other corners with feeler gauge to confirm thickness required is same as before. If not, determine cause and correct.
B- Crankcase to primary chain cover on 1965 to 1969 models with cast aluminum primary - Due to casting variations, contact may occasionally
occur between inner primary cover and crankcase bolt at position D. See “S&S Crankcase Stud Locations” diagram insert in line drawing.
NOTE : Bolting cases and cover together without adequate clearance may create abnormal stress on cover and crankcase.
Improper clearance between case bolt and primary chain cover may cause abnormal stress resulting in damage to cover or crankcases.
To check clearance perform following steps:
1- Bolt assembled case halves in frame.
2- Bolt primary cover to case with gasket in place.
3- Check clearance between case bolt at position D and cover. Grind clearance on cover as needed.
Replacement crankcase parts (starts on next page)
Use the line drawings to identify required replacement parts. Parts designed to fit as direct stock replacements are listed with corresponding Harley-
Davidson® part number. If no Harley-Davidson® part number is shown, S&S part cannot be used in stock application and vice versa.
NOTES
Right and left crankcase halves are not available separately.
•
Parts marked N/A are not available. Parts marked N/S are available but not shown on line drawing.
•
CAUTION
CAUTION