JIMS Box 2 1208-1352 (all models of 120, 131, or 135 Alpha, Beta and Evo Mount Engines) User Manual
Page 8
555 Dawson Drive, Camarillo, CA 93012 Phone 805-482-6913 • Fax 805-482-7422
7
Rev I
8-12
No.1208-1352
A Division of Thiessen Products, INC
• Install the second rail with its gap roughly opposite the gap of the first
rail.
• Make sure the expander spring ends butt and do not overlap.
Installation: Compression Rings
Identification:
• The top two rings are different and each have an “up” side and a
"down” side. They must be installed correctly.
• The first or top (Fig. 23 & 24) ring has a light colored, hard chrome
plated sealing edge face. It has a very small dot on its top about half-
an-inch from one end. Also, one of its inside edges is beveled. Both
the dot and the bevel go up, toward the top of the piston.
• The second ring is very dark, almost black in color. It is marked with
dot or “TOPC” about 1/2” from one end. This identifies the top side
of the ring. Bevel goes down. See Fig. 25.
Installation: Second Ring, See Fig. 25
• Select a second ring. Remember, it is nearly black.
• Make sure the top of the ring is facing up. Remember, the top of the
second ring has a dot or a “TOPC” about 1/2” from one end.
• Grasp the ring with your piston ring expander tool (JIMS No.1235).
See Fig. 26
• With the piston supported on the clean pad, gently expand and guide
the ring over the top of the piston and into its groove. Do not expand
the ring any more than is needed to get it over the piston.
Top ring installation: See Fig. 27
• Select a 1st compression ring. Remember, it has a light colored, hard
chrome plated sealing edge face, a smaller dimple and a beveled
inside edge.
• With the dimple and bevel up, grasp the ring with the piston ring
expander tool.
Fig.24 - Note color, bevel & dot
Fig.23 - Ring placement
BEVEL
Fig.25 - 2nd ring install
Fig.26
Fig.27 - Top ring install
“TOPC” Up
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