Caution – S&S Cycle Stainless Steel Cylinder Base Nuts S&S PN 93-3063 Fits Big Twin Engines 1930-84 User Manual

Page 2

S&S

stainless steel cylinder base nuts PN 93-3063

are a special design that simplifies the assembly
and service of S&S SH-Series 3

⁄

" bore engines.

They may be used on any big twin engine using

⁄

"cylinder studs, providing that the stud

protrusion above the base flange falls within the
range specified. See Drawing Below.

When S&S base nuts 93-3063 are used with S&S
studs 31-2328, and S&S cylinders for shovelhead
engines (with .725" thick base flanges -
produced after Jan 2004). The cylinder can be
lowered over the studs and onto the case before
installing the nuts.

NOTE: In some cases, it may be necessary to
slightly raise the cylinder to start the nuts onto
the studs.

S&S base nuts now accept a

⁄

" box end wrench

(previous design S&S base nuts required a

⁄

open end wrench).

If studs protrude more than the max. dimension
given in the drawing, the base nuts will bottom
out on the stud before tightening down on the
cylinder base flange. The studs will need to be
shortened before installing the the nuts.

If shortening the studs with the crankcase
assembly still mounted in the frame, be
extremely careful not to contaminate the inside
of the case.

If studs protrude less than the minimum
dimension given in the drawing, there will not be
enough thread engagement into the nuts. The
studs will need to be replaced before installing
the nuts. Install replacement studs using high
strength Loctite

609 (green).

Re-positioning existing studs to obtain the
dimension given in the drawing is not
recommended.

After verifying correct stud protrusion, assemble
cylinders to crankcase. Apply a drop of medium
strength Loctite

242 (blue) to upper area of

studs before installing nuts.

.415" max.
.380" min.

Length of exposed thread must fall within this range to use
S&S base nuts 93-3063. Take into consideration not only the
flange thickness, but also the thickness of the base gasket
and stroker plate (if used).

Cylinder base flange

CAUTION

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