evinrude 9.5, 1969

[mchin]

This is my 3rd one and I love these motors, but for some reason they also give me troubles that I don't get from my other motors. Please help, this motor runs great with the cover on, but when I have it off, it hiccups(sneezing?). I am sure I am getting an air leak somewhere, but where? I have rebuilt the carb, and now this thing idles super slow. Now get this, to really figure this out ya gotta also know that the previous owner cut a 5" hole in the top of the hood, and fully sealed off the lower cowls with huge gobs of silicone sealant. So with this hole, air is coming and circulating around, so why with the hood, it runs great and without it I get the hiccups?

Lastly, it pumps water, but I also get steam from the tattle tale hole, is this an impeller problem, or a thermostat issue? Water also comes out, but it seems too hot, hotter then I think it should be. Maybe it's a blocked passage?

thanks
mc

 

[mchin]

Re: evinrude 9.5, 1969

Oh I posted a video to youtube, if you listen closely, you'll hear it cutting in and out. You'll also see the mods done to this poor motor.

http://youtube.com/watch?v=5DkCFu3816A

 

[stl]

Re: evinrude 9.5, 1969

Could be a blocked passage. It does not look like it is pumping enough water. Are you sure that bucket is big enough? Might try a bigger container and see if that makes a difference. That is a long shot though. Those motors are are known to leak exhaust under the hood and the carb chokes out on the exhaust. I think the culprit is usually the exhaust housing seal and is very difficult to change. Hopefully some experts will come along and explain further. I have heard of some modifications that can be done similar to yours but I have never seen any pictures. Very interesting.

 

[freddyray21]

Re: evinrude 9.5, 1969

you need the motor a bit deeper and you need a larger bucket. I use large trash can myself. Can't tell you much about the motor cover. Usually it is just the opposite that they will not run right with the cover on.

 

[stl]

Re: evinrude 9.5, 1969

After looking at your second video on Youtube I noticed that you got a lot more steam after you filled the bucket with the hose, which leads me to believe that bucket is not big enough. The water seems to cover the cavitation plate, but there is too much agitation in that bucket. Like Fred says usually they run better with the cowl off if there is a problem with the exhaust housing seal. There was a problem at one time, hence the modifications. I am anxious to hear what others have to say.

 

[mchin]

Re: evinrude 9.5, 1969

ugh, I took off the LU and broke off one bolt head, the hole was filled with white corrosion, then on to the water pump housing, got the first one out, only to have the other 3 stuck beyond belief. After I remove these little pains, I plan on adding a new impeller, flushing the head from the water tube up ( I have an adaptor that fits from my garden hose to a small tube - hoping to flush silt and scales out). Then upon reassembly, I plan on using anti-seize lube on all my bolts to make sure I can get them out again. All this leads me to believe that it had been a while since the impeller was last changed, rather then risk it crapping out on the water, i figured I should check it out on dry land first. Ugh, I hate when this happens, those little screws on the water pump housing can be a pain to drill out. Of course now I am totally afraid to even try the 3 bolts on the thermostat cover, those are made of super soft metal and always seem to be seized up.

Thanks for all the input, if anyone has any ideas on the hood, please let me know.

 

[samo_ott]

Re: evinrude 9.5, 1969

It sure does not look like it is pumping enough water. How hot is the head to touch when you are running it. If it's too hot I would stop running it. You also might need an impeller housing as they help also. So unfortunately you're gonna hafta get all the screws and bolts out.

That's weird that the previous guy put an air vent in the top! Can rain get in? I assume he realized it was starving for air also and thus put the vent in instead of changing the gasket.

 

[stl]

Re: evinrude 9.5, 1969

That's weird that the previous guy put an air vent in the top! Can rain get in? I assume he realized it was starving for air also and thus put the vent in instead of changing the gasket.

From what I understand changing that gasket is a very difficult job for the novice. So to have a shop do it would be way too costly. I saw a 9.5 on ebay a few weeks ago where someone filled the lower cowl with that yellow expanding foam. It looked like crap, but apperntly the motor was running. I think I would have to find another way. I still can't figure out why yours runs better with the hood on. As far as the water pump is concerned you needed to replace it anyway, but I would still consider running it in a larger bucket.

 

[iwombat]

Re: evinrude 9.5, 1969

My guess is that when you move the latch to take the hood off you're moving it closer to that bottom spark plug boot. Close enough that it arcs across. Worth a looksee anyway.

It could also be adjusted very lean. So lean that taking the hood off leans it out too far.

 

[mchin]

Re: evinrude 9.5, 1969

ya know, you might be right on the too lean, I started with 1.5 turns out from the bottom and while I get a good low idle, it's still not as low as I have had on other motors. I'll try and richen it up a bit, finding the balance between the two. I typically like to run my motors a little on the rich side. Could the fact that I have been using 24:1 and not 50:1 have anything to do with my situation? As far as arcing, well that always could be happening as well, there is some tape on the wires and I haven't even begun to see what is up with that.

I replaced the impeller and there was a lot of sand and grit around, none in the housing, but around the inside. The impeller overall was in fair to poor shape, quite bent at the tips and it started to crack on the reverse side, meaning it probably would've started to shed blades on me. This typically happens when I am far from home. Not a lot came out in the flush, so I really need to check the thermo as well. it may not be opening, causing the steam effect.

Thanks for the suggestions, I plan on trying it out this weekend. I also plan on covering up the hole to see what happens, it should get interesting.