S&S Cycle Electric Compression Release PN 90-4915 User Manual

Page 2

NOTES
●

S&S

compression releases are intended to be installed only

in cylinder heads machined specifically for S&S compression
releases. Stock or other aftermarket cylinder heads may not
have enough material in required areas to allow machining
for S&S compression releases

●

S&S electric compression releases can only be used in
conjunction with S&S die-cast rocker covers or a similar
rocker cover with a center hole or chimney. The chimney
provides clearance for the solenoid which activates the
compression release.

●

Due to the overall length of the compression release
assembly, variations in frames, and the limited space
between the heads and the upper frame tube, it may be
difficult to install the compression releases with the engine
completely assembled in the frame. These instructions are
written assuming there is enough clearance to allow an in-
frame installation, however in some instances it may be
necessary to install the compression releases with the lower
rocker cover in place, or to remove the engine from the
frame. It is suggested that if possible, compression releases
be installed during engine assembly or before heads are
installed on engine.

Installing compression releases

Remove rocker covers.

NOTE: When engine is installed in the frame, there is normally
enough clearance above the heads to install lower rocker covers
with the electric compression releases in place. In some cases,
depending on engine height and frame type, the lower rocker
covers may need to be left on the heads, and compression
releases installed with lower rocker covers in place. In cases of
very limited clearance it may be necessary to remove the engine
from the frame, and reinstall the engine after the compression
releases are installed.

Remove the supplied 14mm hex plug from the top of
the cylinder head. Inspect the machined hole to make
sure that it is clean and free of debris. See Picture 1.

Apply a small amount of anti-seize type thread lubricant
to the threads of the compression release. Compression
releases are identical and can be installed in either
cylinder head.

Make sure that the supplied compression washer is held
in its groove in the valve body. The washer must remain
in this position when the compression release is held in
a vertical position. If it does not stay in position, a very
small amount of white lithium grease between the
washer and the valve body will hold the washer in place
during installation. See Picture 2.

Thread the compression release into the pre-machined
mounting hole. Hand tighten as far as possible. Make
sure the compression washer remains in position until
the compression release contacts the head.

Slide the bottom half of the S&S special socket 53-0046
over the lead wires and onto the compression release
assembly. Position the socket so it is on the hex portion
of the compression release. See Picture 3.

Slide the top half of the special socket 53-0047 over the
lead wires and onto the bottom half of the socket so
that it locks in place.

Make sure the compression washer is seated properly
before final tightening is done. Torque the compression
release to 32-37 ft/lbs.

Remove the socket halves carefully so the lead wire
insulation is not damaged.

Picture 1

Picture 2

Picture 3

Remove threaded plug to install
S&S compression release.

Special S&S two-piece compression release socket 53-0045
allows in-frame installation of S&S compression releases
and protects wiring from damage during installation.

Compression washer
must remain in the
groove in the valve
body during
installation.