Mercury FourStroke 2.5 - Piston;Crankshaft Installation

Powerhead
90-8M0065421 NOVEMBER 2012 Page 4A-35
2. Lubricate rings with 4‑Stroke 10W‑30 Outboard Oil after rings are installed on 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 92-858045K01
Piston/Crankshaft Installation
1. Lubricate the connecting rod, connecting rod cap, and the crankpin journal with 4‑Stroke 10W‑30 Outboard Oil.
2. Assemble the connecting rod to the crankshaft journal.
IMPORTANT: Ensure the "UP" on the piston/connecting rod faces the flywheel end of the crankshaft.
3. Install the connecting rod cap and screws onto the crankpin journal.
IMPORTANT: Ensure the arrowhead and the match mark lines on the connecting rod cap face the flywheel end of the
crankshaft.
110110
a
b
c
110110
e
d
TT
TT
4545
oo
4545
oo
c
b
a
e
d
UP
f
g
h
3150
i