9. Remove the main bearings from the cylinder block and crankcase cover.
Piston Disassembly
IMPORTANT: Disassemble each piston separately to ensure the components will not be intermixed. After disassembly, place
the components into a container that identifies the cylinder location.
1.
Remove the piston pin clips, and piston pin. Separate the connecting rod from the piston.
2. Use a piston ring expander to remove the top ring and the second ring.
3. Use a piston ring expander to remove the oil ring top scraper, bottom scraper, and the oil control ring.
a - Oil rings
b - Second ring
c - Top ring
d - Piston pin
e - Piston pin clip (2)
Piston Ring Expander 91‑ 24697
Powerhead Cleaning, Inspection, and Repair
Flywheel
Inspect the flywheel keyway and teeth. Replace if damaged or worn.
Cylinder Block/Crankcase
Page 4A-16 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
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