3. Hold the spacer ends together and install the lower oil control ring with its gap properly located.
Ring gap locations
a - Oil ring spacer gap
b - Oil ring gaps
c - Lower compression ring gap
d - Upper compression ring gap
e - Front of engine
4. Install the upper oil control ring with its gap properly located.
5. Flex the oil ring assembly to ensure that the rings move freely.
IMPORTANT: Use the piston ring expander for compression ring installation.
Piston Ring Expander
91‑24697
6. Using a piston ring expander, install the lower and upper compression rings with the marked side up.
Piston/Connecting Rod Assembly
1. Install the connecting rod into the piston with the odd number cylinder: Connecting rod dot down, piston dome dot up. Even
number cylinder: connecting rod dot up, piston dome dot up.
2. Lubricate the piston pin with Lubriplate SPO 255.
3. Assemble the piston, connecting rod, piston pin, and secure with new piston pin retaining clips.
a - Connecting rod
b - Piston
c - Piston pin
d - Piston pin retaining clip (2)
Tube Ref No. Description Where Used Part No.
136
Lubriplate SPO 255 Piston pin Obtain Locally
Piston and Rod Installation
IMPORTANT: Cylinder bores must be thoroughly clean before piston installation.
Engine Inspection and Assembly
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 3B-25
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