1977 Evinrude 15hp pull start

[jimmbo]

The Flywheel and Crankshaft Taper should be Lapped, to insure the Contact Fit between them is 100%
Get a new key
A Torque Wrench is Critical on Tapered Fittings. Even a few too many Pound Feet of Torque will Ruin the Flywheel

 

[racerone]

Need to lap flywheel / crank tapers.-----Need to use a factory key.----Crank and nut threads must be in good condition.----Torque nut to 45 FT LBS

 

[keithb7]

The upcoming carb work could be a bit frustrating. We’re here to help, so post your questions. In my opinion owing an old 2 stroke outboard means doing repairs at home. Do you have or have access to an ultrasonic cleaner? They are great for carb work.

 

[Bl7nderer]

The upcoming carb work could be a bit frustrating. We’re here to help, so post your questions. In my opinion owing an old 2 stroke outboard means doing repairs at home. Do you have or have access to an ultrasonic cleaner? They are great for carb work.

I haven't gotten an ultrasonic cleaner yet, but I suspect it is going to be in the plan for the near future.

 

[Bl7nderer]

Did you use a torque wrench on the flywheel nut to prevent the same thing or worse from happening again?

I'm not that far yet. I'll be lapping the crankshaft to the flywheel before that happens. I also need to get a new key. This one is bent and scarred.

 

[Bl7nderer]

New key purchased and on the way, but I found out that lapping compound has so many varieties I am unsure what to get. Anyone have any suggestions?

 

[Mc Tool]

Dress the edges of the keyway with a fine file, and just about any fine abrasive will do to lap it (or you could splash out for some genuine OMC flywheel lapping compound ) . I have used kitchen cream scourer before. It wont be a million miles away and most likely will just need a light polish .

 

[racerone]

Fine valve grinding compound will do it in minutes.----Remember , the key locates the flywheel for proper timing.----The flywheel is driven by the matched locking tapers.