Caution – S&S Cycle Pinion Shafts for Big Twin User Manual

Page 3

With key in shaft, insert into respective tapered hole in
flywheel and check to see that key does not bottom in
key way of flywheel taper. If key bottoms out, file or
sand flat side of key, not rounded side, until shaft with
key in place fits in flywheel without bottoming out.

Assemble flywheel and shaft. Use stock factory
torque specifications (140 to 170 ft-Ibs.) in stock, cast
iron flywheels. For S&S

forged steel flywheels

tighten nut to 275 to 300 ft-lbs. S&S

recommends

that green Loctite

(RC609) or similar thread locking

product be used on taper of shaft, threads of shaft,
and face of nut.

Blow air through connecting rod oil feed hole in end
of pinion shaft after flywheel, crankpin and pinion
shaft have been assembled to insure that
passageway is open.

Restricted or blocked oil passage may result in
insufficient oil flow, and cause premature wear and
damage to internal engine components.

Finish assembling and truing flywheels.

Select correct size main bearings per Harley-Davidson

factory procedures. Consult appropriate Harley-
Davidson

manual for style of bearings used.

10. Install main bearings on pinion shaft.

NOTES:
●

There are two styles of flywheels which will accept the
S&S 33-2027 pinion shaft. Stock 1981 to 1986 style
flywheels are machined with a small diameter
shoulder around the pinion shaft taper to accept a
main bearing thrust washer. See Picture 1. Stock 1987
to 1989 and all current production S&S flywheels for
late 1981 and later engines, are machined with a large
diameter shoulder around the pinion shaft taper. This
shoulder is designed to eliminate the main bearing
thrust washer previously used. See Picture 2.

●

There are three types of pinion main bearings which
may be used with S&S 33-2024 and 33-2027 pinion
shafts. Picture 3 shows the 1958 to 1986 style bearings
which consist of two open ended steel cages and drop
in roller bearings. The 1987 to 1993 style (FAG)
bearings consist of two stamped steel cages with roller
bearings installed. See Picture 4.

CAUTION

Picture 1

Picture 2

Picture 3

Picture 4