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Tuned pipe and exhaust cone keep separating

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FinnExplorer

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The problem in the title. I've been trying to move the sealing ring and the clamps to different positions but it always pushes tuned pipe and exhaust cone apart. Sometimes the seal ring and clamps stay with tuned pipe and sometimes they go with the cone. Boat didn't do this before engine rebuild. Is it something to do with increased back pressure? Is something now restricting the flow on the exhaust.

Thanks again for the answers so far guys.
 
The stainless steel clamping ring should hold the 2 parts very tight. If they are separating... then there is damage to either the pipe, or the clamp.


If you mean that they are just leaking a little, and not separating... then clean the parts very well, put in a new sealing ring, and use some high temp RTV to seal it.
 
as Tony mentioned, that clamp tightens those 2 parts together. It is essentially V band clamp...
post some pictures? are the clamps damaged in some way? the sealing area`s need to be free from any corrosion buildup (salt/sand) and mate perfectly. The RED high temp, or Copper high temp RTV will fill in any imperfections and seal just fine...
 
Here's a pic of it... It seems like the seal is bit too left now compared to clamp(to tuned pipe side) although i've been adjusting it a lot already... It didn't leak when driving, no rust either on the surfaces... the two pipes just pop off each other when I try to drive a little.
20130714_155511.jpg

the angle of the pic makes it look like the cone is not aligned straight, but it is. The seal and the clamp are not on top of each other in the pic, but I already tried to align all the parts. Maybe the clamp has gone bad.
 
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ok, I am wrong with that info. my info was for a 787, different tuned pipe set up...

you have a rubber coupler and T bolt clamps...

maybe the rubber is shot, or your not tightening the clamp enough...

I would set those 2 exhaust parts straight first and secure before attaching to the water box.

maybe you also have a bad motor mount pulling them apart, I really can`t diagnose from the internet arm chair...lol

http://www.sea-doopart.com/oemparts/a/sea/500cfd66f870021b3c6a803a/exhaust-system
 
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I unbolted them one more time and pushed it few times around and left it so that it stopped to the tuned pipe side. Then I tightened the clamp. It stayed on for 45 minutes so I guess problem solved. No idea what was going on there but seems to work now. Back to break-in session now! :auto:
 
Hi. I am new to this forum and was happy to see that I wasn't alone with this problem. I recently bought an older 1996 Sea Doo GTI with a Rotax engine. The machine is in really good condition except for the tune pipe and exhaust cone seperating. The fellow I bought it from did some work on the machine and took the two apart and then put them back together thinking that it was pretty straight forward. When I took it for a test drive they seperated. The first time we thought it would be an easy fix... just put back on and tighten, it didn't last very long and it went again. Fixed it again thinking maybe we just didn't tighten the 2 nuts on the clamp good enough and again it didn't last. I ended up buying it anyway thinking how hard can this be to fix but I am still trying to fix it. I was thinking that the next thing to try would be to get a new clamp and rubber ring. I will clean the housing good before I put it on and try some of the rtv seal and if that doesn't work then I don't know what to try. If anyone can give me there solution it would be greatly appreciated!
Thanks
 
It may be something I will have to try although I'm not sure it will work with the Large rubber hose/pipe that goes on before the clamp...any thoughts on that? I just bought the Sea Doo this past Saturday and it is the first one I have ever owned so this will be a learning curve for me...Yikes!
 
It may be something I will have to try although I'm not sure it will work with the Large rubber hose/pipe that goes on before the clamp...any thoughts on that? I just bought the Sea Doo this past Saturday and it is the first one I have ever owned so this will be a learning curve for me...Yikes!

Yes, I would coat the adhesive between the rubber hose and the sealing surface of the cast aluminum manifold before assembling then install the outer clamp with no cement, it will probably help. Also make sure to inspect the exhaust system for obstructions if possible, there should be no restriction but I would confirm.

The exhaust must be leak tight, otherwise an exhaust leak in the bilge will fill the space with carbon monoxide and starve the engine of oxygen.
 
Hi. I called my local dealer and they also say to use the rtv adhesive or something similar so that's good. I also thought I would get a price on the sealing ring and clamp. He said the single clamp has now been changed to 2 clamps. I was thinking of giving that a try but was concerned about possibly blowing out the center of the sealing ring between the clamps. What do you think?
Thanks for the info!
 
Hi. I called my local dealer and they also say to use the rtv adhesive or something similar so that's good. I also thought I would get a price on the sealing ring and clamp. He said the single clamp has now been changed to 2 clamps. I was thinking of giving that a try but was concerned about possibly blowing out the center of the sealing ring between the clamps. What do you think?
Thanks for the info!

Yes, I can't say with 100% authority that bellows cement will solve your particular problem, however, I work in a professional shop and I use this cement for similar applications b/c it's necessary to obtain a reliable repair and it is the factory specified adhesive for many of the repairs that I perform.

So someone will probably feel compelled to come along to this thread and post something like "Do you know what you're talking about?", but so be it.

I suggest trying bellows cement b/c that's what I would use in my shop working on a customer's boat if I were experiencing a similar problem. If I was doing the work for myself on my boat at home, I would use rubber contact cement unless a tube of bellows cement happened to be in my toolbox, these two compounds seem like the exact same product to my sniffer.

As far as the clamps go... Unless there's something obviously wrong with the clamp you have(perhaps it's stretched or somehow damaged?, it seems like a better choice to me than two separate clamps.

I'm not a big fan of RTV silicone sealers, can't understand why people seem to like that stuff so much b/c the adhesion is never complete, seems like. I can usually find something else that works as well or better, we have some great sealers these days.

An even better adhesive, IMO:

I bet 4200 polyurethane sealer would work great on your bellows as well, maybe even better than bellows cement. Silicone sealers remind me of camel snot and I have yet to find anything they will actually stick to.

http://solutions.3m.com/wps/portal/...pair/GeneralBoatRepairs/SealantAdhesiveGuide/

4200 and 5200 are wonderful sealing products, 5200 IS PERMANENT so don't put it on anything you may ever have to disassemble, it cures nearly rock hard and the bond is beyond tenacious.

Clean the surfaces as well as you can to remove grease and oil, I would use acetone and a stiff bristle brush, some clean rags.

FYI - I've probably never worked on that model of ski you have there, I mainly work on Mercruiser sterndrives. Our marina doesn't service Seadoo products. NO GUARANTEES this will fix your problem, perhaps one of the ACTUAL PREMADONNA EXPERTs loitering on this message board will visit this thread to shine his MAGNIFICENCE and magically resolve all your problems..........
 
Hi. I am new to this forum and was happy to see that I wasn't alone with this problem. I recently bought an older 1996 Sea Doo GTI with a Rotax engine. The machine is in really good condition except for the tune pipe and exhaust cone seperating. etc...

Do you have a pic of your setup there? It looks pretty much the same as mine apart from part#. I believe the tuned pipe and cone are just bit "misaligned" like in my case.
 
Thanks for all the info. I'm not sure what I will try yet for a sealer. I'm not sure I want to go with something that permanent because I'm sure there will be other times that I will have to take the tune pipe apart but if I can't get it fixed any other way I may go that route. I am going to try the 2 clamp system which the 2 dealers I called are now saying thats what they sell.
 
Compare this picpipe.jpg with my earlier one. The cone and rubber part were not pushed far enough to the tuned pipe side. It first felt like it was pushed as far as it would go, but in the end wasn't.
 
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Hi Finn...Thanks for the picture.I am going to give it a try with new clamps (2 singles) and some sealer. I am sure that I had the cone tight to the head before (5 tries) and it still would not hold. I am leaning toward the clamp being stretched or just worn out. I hope to have it running and in the water in the next few days. Hopefully there won't be Ice on the Lake by then because it feels like it is going to snow anytime now. Not looking forward to the test Drive. lol
 
I know the feeling... The season ain't too long here either, I've already had to winterize last week. Nightime temps have been freezing for few nights. Hope you get the pipe and cone to stay where they should.
 
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