Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

[OptsyEagle]

I keep finding black rubber material in my water exit cavity (just above the cavitation plate) of my 1975 9.9Hp Evinrude. I keep struggling to pull it through the holes so as to ensure no obstruction here. By the time I get it through the holes, it is impossible to identify what it is. The engine runs great, the pump keeps the motor at its proper temperature.

I saw the first piece of rubber late last year when I changed the impeller and thought that maybe it was a broken piece of impeller that fell in there when a previous owner had the lower unit down and was changing the impeller (only way I could see impeller material getting that far). I cleaned it out at that time and now I have more of it.

Any idea what it might be and if it will create any problems in the future?

 

[Lodgepole]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

No harder than it is, I would drop the LU and have a good look at the latest impeller. Also check to be sure the water tube has not sliced the gromet where it goes up toward the power head.

 

[jtexas]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

Somewhere in this motor's past it chewed up an impeller, and the liberated fragments are making their way through the system. Fortunately, none of them has yet clogged the cooling passages in the powerhead to a catastrophic extent.

 

[OptsyEagle]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

I am about 100% positive that it is not impeller material since it would be virtually an impossibility for it to travel up the copper tube, through the engine and back down the exit part of the motor, so that it could end up where it is. Some of the pieces were just to big, in my opinion, plus it is pumping water very well.

I suspect it really must be something, made of black rubber, that is in the water passage "after" the water has gone through the engine.

 

[HighTrim]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

The only thing that I can think of is the rubber seals between the exhaust housings. Did you check that when the lu was down? Other than an old impellar im not sure. Next time you drop the lu, pull the t stat and blast compressed air up the water line to ensure you dont have anything blocking the water route, for peace of mind. Also pull the impeller liner plate up and check around the water intake for debris.

 

[OptsyEagle]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

Hightrim, are those seals made of black rubber material and is it possible to see if those seals are intact without taking down the lower unit. How critical are those seals to the operation of the motor?

I am also wondering about the upper water tube grommet and the exhaust housing to shift rod grommet. Could pieces of those fall down into the water exit cavity of the motor and would the motor operate OK if they did?

 

[HighTrim]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

I think your best bet is to drop the lu and check them, they are so cheap i wouldnt worry about safetly running your motor without them. They are made of a black rubber and do sometimes tend to get brittle with age. I like to clean my exhaust housings when I drop the lu to change my impellar. If you drop your lu, blast air up the water line, clean out the water intake area, and check on the exhaust and housing seals, Im pretty confident you'll solve your problem. Let us know what you find

 

[OptsyEagle]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

Are these seals visible when one looks up the motor after the lower unit is removed and can one change them after the LU is removed or does one have to remove other parts (like the exhaust housing or powerhead)?

 

[HighTrim]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

Here is a complete diagram for you.

http://epc.brp.com/default.aspx?brands=ej&lang=e

 

[iwombat]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

You need to remove the powerhead to change those seals. A good way to check them is to attach a host to the water tube and see if you get any leaks under the powerhead.

 

[OptsyEagle]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

Sorry for my ignorance, but what exactly is a host? Thanks for your reply.

 

[HighTrim]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

I think he meant hose, lol Bat gets into the brown pops now and then, jk! You could also hook an air line up to it if you have a compressor. less mess and no water all over the powerhead.

 

[OptsyEagle]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

For a very short time there I thought I knew a fair bit about outboard motors, but one wouldn't think so with all these stupid questions today.

If I connect up a hose (water or air) to the water tube to check for leaks. Where would I see the leaks that might be at the powerhead? Would they leak back down the inside of the lower unit or the outside? and how big of problem is this?

Another observation, now that I think about it, is that I do get a little water coming out on the outside of the swivel bracket area. It is pretty close to the water pump and I just figured that it was water shooting out underneath the impeller plate. Since I had enough pressure to get it up through the motor and out the exhaust hole, I didn't really worry about it. As I said earlier, the engine seems to run fine and the cooling appears to be functioning properly.

 

[iwombat]

Re: Rubber in Water Exit Holes - 1975 9.9Hp Evinrude

Sorry about that. The problem was not ENOUGH wobbly pops - long day.

Anyway, you'll see the leak just under the powerhead it may be hard to tell what's going on. But, if you put a little bit of pressure on that tube (not too much or you'll blow past seals elsewhere) you really shouldn't see any water come out anywhere but the prop.

If it leaks like a sieve under the powerhead, then you've probably sucked up that o-ring.