7. If the oil clearance is out of specification limit, measure the diameter of the connecting rod and crankpin journal. Replace
as needed.
Powerhead Assembly
Piston Assembly
1.
Insert the connecting rod into the piston.
IMPORTANT: Ensure that the "UP" indicators on the connecting rod and piston are facing the same direction.
2. Lubricate the piston pin with 4‑Stroke 10W‑30 Outboard Oil.
3. Install the piston pin, and secure it with new piston pin clips.
a - Connecting rod
b - Piston
c - Piston pin clip (2)
d - Piston pin
Tube Ref No. Description Where Used Part No.
110
4-Stroke 10W-30 Outboard
Oil
Piston pin 92-8M0078625
Piston Ring Installation
IMPORTANT:
Use caution when installing piston rings, to avoid scratching the piston.
1. Use a piston ring expander to install the oil ring, second ring, and top ring.
IMPORTANT: The "T" on the first and second ring must face the crown of the piston.
Piston Ring Expander 91‑ 24697
Cylinder Block/Crankcase
Page 4A-24 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
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