S&S Cycle Oil Carry-Over User Manual

S&s cycle, inc, Oil carry-over

S&S Cycle, Inc.

14025 County Hwy. G P.O. Box 215

Viola, Wisconsin 54664

Phone 608-627-1497 Fax 608-627-1488

Customer Service - [email protected]

Technical Assistance - [email protected]

Technical Bulletin

Revised 2-03-99

by S&S Cycle, Inc.

S&S Technical Bulletin

Oil Carry-Over

Subject: Oil carry-over associated with S&S Big Twin-style
crankcases S&S has received reports of excessive oil carry-
over associated with a limited number of S&S Super Stock
Alternator Crankcases for Big Twins. This condition is recognized
as excessive oil exiting the crankcase breather vent after
sustained high-RPM operation. A small amount of oil-air mist
exiting the breather vent is normal, and should not be considered
a problem. If there is doubt concerning whether a problem exists,
contact S&S.

Crankcases affected:
Affected crankcases were manufactured between December,
1995, and June, 1997, with serial numbers ranging from W1848
to X6239. Not all Super Stock crankcases within this group are
affected, and this occurrence has not been associated with S&S
Generator-style or Special Application crankcases.

Before proceeding, it is important to understand that there are
many possible causes of excessive oil carry-over. These typically
include but are not limited to worn or damaged piston rings or
other engine components, restrictions in the oil return line, an
incorrectly machined gearcase cover, and the use of a gearcover
gasket from an incorrect year group.

What to look for:
If excessive carry-over is encountered in association with an S&S
crankcase from the above group and no other cause can be

identified, confirm that the crankcase serial number is between
W1848 and X6239. Suspect crankcases fall within this range, but
may also be identified by the absence of an S&S logo near the
serial number. S&S logo on unaffected cases is illustrated in
Picture #1.

What to do:
1.

Remove the gear cover; refer to a Harley-Davidson Service
Manual as necessary.

NOTE- Before removing the gear cover it is necessary to remove
valve spring tension from the cam by collapsing the pushrod
adjusters. If unfamiliar with this procedure, consult a professional
mechanic.

Inspect the oil return holes indicated in Pictures #2, #3 and #4.

Compare the oil return hole in the suspect crankcase to the
return holes in Pictures #2, #3 and #4.

If the oil return hole is the same as in Picture #2, the crankcase
may be modified to minimize carry-over; contact S&S Technical
Services at 608-627-1497 for additional information. The
modification may be performed without removing the engine from
the frame.

NOTE - Crankcases of the type shown in Picture #3 and Picture #4
do not require modification.