60's Evinrude Sportwin carb problems

[cr9c1]

Re: 60's Evinrude Sportwin carb problems

It was #78 in mine, and yes, I had to remove the power head to get to it. I used Permatex indian gasket cement on #78 and the seal from the power head to the midsection to be safe. To put #78 back in, I had to remove 3 phillips head screws on the bottom side where the shift rod and water tube goes up through.

iwombat, yes it does idle with the cowling on. Its a nice change. My father is going to drill some small holes in the cowl to see if that improves the air flow some just as a preventative measure. It runs with the cover on in a barrel so I figure thats as good as test as any seems how exhaust smoke surrounds the entire engine.

I also had a seal in better shape (The small round one that sits under the powerhead and above the midsecion) that was in better shape that I also used. Its listed as seal #83 on the diagram posted above this post.

 

[iwombat]

Re: 60's Evinrude Sportwin carb problems

I'd advise against drilling those holes. You may lean it out enough to cause real problems.

 

[cr9c1]

Re: 60's Evinrude Sportwin carb problems

Yeah, its an idea at this point. I still have to take it out and try it on the boat. Yesterday was too nasty here in Downeast Maine to do that. Raining and the likes. Today looks much nicer out.

 

[lexkyboater]

Re: 60's Evinrude Sportwin carb problems

Thanks for the feedback. How difficult is it to remove the powerhead? I've never done that and was just curious if it's a matter of removing #1 in the diagram - the lower cover assy - and then I'm guessing 4 bolts to remove the powerhead from the exhaust housing assy? Do you have any pictures? Sounds like you're quite comfortable working on these, and have a parts motor? I do have a copy of about 10 - 12 pages of condensed service data from an old Clymer manual for my motor, but haven't looked at the powerhead removal process in detail. --Steve

 

[cr9c1]

Re: 60's Evinrude Sportwin carb problems

The way I do it, and some others may know of an easier way is to split the two halves. There's a bunch of big phillips head screws through the case and some 7/16 and 3/8ths bolts as well. You have to disconnect the throttle linkage from the arm assembly, as well as the shift rod that comes up into the actual shifter lever. There is also a flat head screw that you'll have to remove from the half u-shaped turning arm right above the engine cradle.

There's two 7/16ths bolts in the bottom that bolt to a lower rubber mount, two acorn style nuts, one on each side, and two more 7/16ths bolts behind the powerhead that attach to a mount. There are two small nuts going through the exhaust manifold hooked to a stiff metal bar that is attached to the case on the steering arm side, and two bolts that go down through carb bowl that bolt to a stiff metal piece attached to the case also. You'll have to remove the black rubber boot style thing that pukes exhaust and water to the outside.

I can't think of anything else on the top of my head but I highly suggest taking pictures and/or labeling all bolts remove and where they go. They're is a funky shouldered type bolt for the throttle linkage and some spring washers that allow it to turn back and forth.

When you have successfully split the two halves apart (And I also suggest removing the lower unit prior to any of this) the power head is held on with 7 or 8 7/16ths (I believe) bolts going up through the bottom. Then the powerhead basically lifts off.

 

[lexkyboater]

Re: 60's Evinrude Sportwin carb problems

Okay, doesn't sound too bad. I've rebuilt a couple of automotive engines, but haven't done any marine yet. Like a lot of the guys here say, everything's right there so they're easier to work on. Just lack of experience with them is my main issue right now. Sounds like we've both got our motors singing at this point, so that's a good thing... --Steve

 

[iwombat]

Re: 60's Evinrude Sportwin carb problems

Here's what you'll be looking at right before the powerhead and exhaust assembly come out of the clamshell as a unit. Pulling the powerhead on the 9.5 is about the most involved process for any of the small twins. That said, it's still not too bad.

 

[lexkyboater]

Re: 60's Evinrude Sportwin carb problems

Okay, great - thanks for the pic. I think I could do that.