evinrude 120 fly wheel prob

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robert.barnes

Seaman
Joined
Oct 4, 2006
Messages
62
what would cause a fly wheel to keep coming loose and shearing the key stock done it twice and i torqed it to speck both times
1985 evinrude 120
 
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ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: evinrude 120 fly wheel prob

Flywheel nut must be torqued to 140-150 ft lbs. 190-204 N-m.
 
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robert.barnes

Seaman
Joined
Oct 4, 2006
Messages
62
Re: evinrude 120 fly wheel prob

thats what i did but it keeps coming loose i took sand paper and cleaned it all off i will try it again is there any thig that would cause this
 
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Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: evinrude 120 fly wheel prob

Several things will cause this.

Let's start with the basics. What did you use the sandpaper on? Not the crank or flywheel taper I hope.
 
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robert.barnes

Seaman
Joined
Oct 4, 2006
Messages
62
Re: evinrude 120 fly wheel prob

yes i just cleaned off the goop i thoght that might be the prob i used 1000 grit it bearly shined the metal
 
clanton

clanton

Rear Admiral
Joined
Jul 9, 2001
Messages
4,876
Re: evinrude 120 fly wheel prob

The flywheel and crankshaft mating surface must be clean and dry, no goop, or oil. Use Evinrude gasket sealer on the threads of the nut. You can lap the two surfaces with a fine valve grinding compound.
 
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