120 hp Evinrude 4 cyl looper outboard - flywheel nut

E

elengineerio

Cadet
Joined
Aug 18, 2012
Messages
6
The nut on the flywheel of this engine is supposed to be 1-5/16 based on eyeball measurment and literature. I have tried two different 6 point impact sockets and a 35mm 12 point socket and nothing has fit over the nut. Is there is special tool that is required and if so what is the part number.
 
C

cwella

Seaman
Joined
Jul 10, 2026
Messages
54
elengineerio said:
The nut on the flywheel of this engine is supposed to be 1-5/16 based on eyeball measurment and literature. I have tried two different 6 point impact sockets and a 35mm 12 point socket and nothing has fit over the nut. Is there is special tool that is required and if so what is the part number.
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Have you tried measuring the nut with calipers? It may be slightly oversized, damaged, or a different size than the manual lists. A 1-5/16” should be very close to 33.3mm, so a 35mm should normally have some play. Some flywheel nuts do require a thin-wall socket or a manufacturer-specific tool if clearance is tight. Check the exact engine model and serial number to confirm the correct socket/tool part number.
 
M

Mc Tool

Lieutenant Commander
Joined
Aug 7, 2024
Messages
1,641
Do any of the omc stuff have left hand threads on the flywheel nut ? My Tohatsu did ...but the new crankshaft I got was right hand thread .....so I had to get the blimmin nut as well 😡just when I really didnt need another hold up 🙂
 
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