lower unit gears interchange?

[ShafferNY]

I have a '77 55hp Evinrude. The gears in the lower unit are starting to go bad. It won't shift into reverse because the cogs on the reverse gears are worn/rounded. <br /><br />I have a perfectly good set of gears out of a 115hp of about the same year. Will they interchange or are they too big?

 

[CATransplant]

Re: lower unit gears interchange?

Looking at the parts diagrams for both motors from 1977, they aren't interchangable. You can check for yourself at ishopmarine.com. Click Parts Lists, then drill down to your model in the ensuing screens.

 

[CATransplant]

Re: lower unit gears interchange?

According to the ishopmarine.com page for your engine, the part number for a complete gearset is OMC 0433618. You'll want to double check this, but that might help you. Price was $312 for the set. They didn't seem to stock just the reverse gear.