2. Lubricate the rings with 4‑Stroke 10W‑30 Outboard Oil, after the rings are installed on the piston.
a - Top oil control ring
b - Expander
c - Bottom oil control ring
d - Second ring
e - Top ring
f - End gap ‑ Top ring
g - End gap ‑ Bottom oil control ring
h - End gap ‑ Second ring
i - End gap ‑ Top oil control ring
Tube Ref No. Description Where Used Part No.
110
4-Stroke 10W-30 Outboard
Oil
Piston rings 92-8M0078625
Piston Installation
IMPORTANT:
The cylinder bores must be clean before installing the pistons. Clean the bore with a light honing as necessary.
After honing, clean the cylinder bores with water and mild detergent. After cleaning, swab out the cylinder bores with engine oil
and a clean cloth. Wipe the cylinder bore with a clean dry cloth.
1. Lubricate the piston, rings, and cylinder bores with 10W‑30 4‑Stroke Marine Engine Oil.
2. Use a piston ring compressor tool to compress the piston rings.
3. Using the piston ring compressor tool, install the piston/connecting rod assembly into the cylinder block.
4. Push down on the piston compressor tool to ensure that the tool is firmly seated against the block.
Cylinder Block/Crankcase
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4A-25
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