S&S Cycle Super Stock and Special Application Crankcases for 1936-99 Big Twin Engines - Manual (Page 8)

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Installation: 1980 and later models with crankcase breather vented to carburetor air cleaner.
1- Install 50-8113 45° 1⁄4“ pipe x 3⁄8“ hose fitting (See Line Drawing, item 33) in hole E.
2- Connect 3⁄8“ hose to 50-8113 fitting and route in stock-like manner to breather fitting on rear of air cleaner backplate.
Installation: 1993 and later style engines with crankcase pressure vented through cylinder heads. Install 50-8330 1⁄4 -18 pipe plug in hole E.
NOTE: Although all S&S® crankcases are machined for crankcase breather vent, some late chassis lack sufficient room between crankcase and
transmission/oil tank for correct breather fittings. S&S discourages use of crankcase vent without correct fitting due to possibility of oil reaching rear
brakes or tire or abrasive contaminants entering crankcase. In these instances, crankcase pressure must be vented through cylinder heads as on 1993-up
big twins. With cylinder head venting, hole E must be plugged for reasons mentioned above. Additionally, leaving hole E open with 1993-up gearcover
will cause large oil losses.
F- Oil supply passages
Location: Holes F & G. See Pictures 4, 5 & 6.
Hardware: 50-0024 socket head set screw. See Line Drawing, item 47.
Installation: See Section 7F, Oil Pump, and important note immediately following Section 7F.
NOTE: Installing stock 1973-1980 shovelhead oil pump on S&S® alternator style crankcase will expose oil passage immediately above crankcase hole for
top outside oil pump mounting bolt, resulting in large oil leak. See Picture 11. Using S&S oil pump is recommended. Otherwise, passage indicated (See
Picture 12) must be carefully tapped for 8-32 set screw, and set screw installed with green Loctite®. Perform procedure prior to assembling crankcases and
carefully remove all metal chips generated during procedure.
Picture 11 Picture 12
Note
difference
between S&S®
pump on left
and 1973-’80
pump on right.
G- Timing mark access hole
All models
Location: Hole A. See Picture 13.
Hardware: 31-2005 timing hole plug. See Line Drawing, item 25.
Function: Hole serves as access to view timing marks on left flywheel when setting ignition timing.
Picture 13
Hole A