S&S Cycle Mechanical Compression Release PN 90-4925 - Manual (Page 2)

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NOTES
S&S® compression releases are intended to be installed only in cylinder heads machined specifically for S&S compression releases. Stock or other
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aftermarket cylinder heads may not have enough material in required areas to allow machining for S&S compression releases
S&S mechanical compression releases can be used with OEM or aftermarket rocker boxes. Since the height of the installed compression release assembly
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will be slightly below the lower rocker cover mounting surface, the mechanical compression releases do not require the use of rocker boxes with a center
chimney for clearance.
A. Installing Compression Releases
1. Remove fuel tank, rocker covers and bases, pushrods, and rocker arms. Consult appropriate manuals as needed.
2. 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.
3. Apply a small amount of anti-seize type thread lubricant to the threads of the compression release valve assembly. Compression release
assemblies are identical and can be installed in either cylinder head.
4. 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.
5. Thread the compression release valve assembly 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. See Picture 3.
6. Slide the S&S special socket PN 53-0045 over the valve assembly. See Picture 4. Make sure the compression washer is seated properly
before final tightening is done. Torque the compression release to 35-40 ft-lbs.
Mechanical Compression Release Kit
Picture 1
Picture 2 Picture 3 Picture 4