Evinrude Sportwin Help

[Andrew67]

Found this video on taking apart the bottom end. Its those gears im supposed to inspect?

https://youtu.be/V7hiP3AHdRg

[billw]

You don’t need to inspect any gears yet. Just remove the lower unit assembly, whole, and set it aside. Then go back to the top end of the engine and see if the flywheel will turn. If it DOES, then the problem is with the lower unit. If it still does NOT turn, the problem is internal with the power head..

Long live American manufacturing!

[Andrew67]

billw wrote:

You don’t need to inspect any gears yet. Just remove the lower unit assembly, whole, and set it aside. Then go back to the top end of the engine and see if the flywheel will turn. If it DOES, then the problem is with the lower unit. If it still does NOT turn, the problem is internal with the power head..

I had the lower unit off already and it seams fine. What is in the powerhead that could cause it to not move?, just seized heads?

I have stripped all the bolted on parts off the head to inspect, clean and repair if needed. The soaking seams to have worked on the top piston as all the crap is gone. I soaked the bottom one and will take the head off tomorrow. I don’t know the names for everything so is there a manual still available? I will need parts.

Thanks for the help, I need it on this one.

[Geer Pyron]

I’ve been working on a lot of these motors lately. Just finished and parted ways with the “Sweet ‘61”. Sad to see it go. Such a nice little motor…
Anyway, I’ve always had the best luck with motors when I take them completely apart. Some will say do as little as possible, but I find myself chasing problems with that approach. Take it apart. Split the case. Easy to free stuck pistons when one actually has access to them. PB Blaster, a wood dowel as fat as the cylinder allows and a hammer. Doesn’t take days of soaking or ovens. When the piston is unstuck, make sure you beat it the right way to get it out. I use a fat dowel with a rounded end to fit in the connecting rod.
And once out, if the rings are stuck, DO NOT break them in your haste. Take your time there. It’s really hard to find rings for that size and era of motor. Dunno why.
Furthermore, taking the whole thing apart allows one to clean it all up, finger hone the cylinders, inspect the bearings, and shoot, even measure how round the cylinders are. You can even blow out the internal oil passages while it’s apart. And if it’s the first one you’ll be doing, it’ll be like that first fish you had to clean!
Why not?
Juss sayin’.

 

JMGP

[billw]

While I agree totally with Geer, and that is my method of operation too, some people just don’t want to get in that deep. This is why I had mentioned trying to turn the engine using a strap wrench on the flywheel. Sometimes, even though it may initially seem very tight, it will break free and start to tun well, within a few revolutions. Your cylinders don’t look horrible in the picture; although I would have liked to see it as soon as the head came off and before any work was done in cleaning it up. Anyway, if you don’t have a strap wrench, they can be had pretty cheaply on the interweb. Get a nylon strap, though. Rubber straps are not strong enough.

Long live American manufacturing!

[fleetwin]

Yeah, Geer’s approach is surely the best, but maybe more involved than most prefer to go, not everyone has the skills to do powerhead work. Did you pull those intake covers like someone suggested? This will give you a good look at the rings so you can determine if they are stuck. What are you soaking the pistons with, kinda looks like soapy water! Try reinstalling the flywheel and attempt to rock it back and forth ever so slightly. If that does nothing, try tapping the pistons with the heavy wooden dowel/hammer as others have mentioned. Don’t get too aggressive though. Those coils are shot, that igntion system will need to be overhauled. How did the oil in the gearcase look? Was it relatively clean? Or was it milky with water inside. The gearcase on these engines is a weak point and it is crucial that they do not leak oil.

[Author]

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