Silicone around Exhaust Manifold - HCS Snowmobile Forums

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Old 08-09-2010, 12:21 AM   #1 (permalink)
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Just had a polaris tech do some motor work on my 07 600 CFI and he noticed that previous owner had put silicone between motor and exhaust manifold???? All the service work had previuosly been done by the local Polaris dealer. He thought it might have been because of oil leaking out and said he checked pistons and they looked good? Has anyone else done or heard of this? Is there something wrong to look for?

Thanks for the input!

Mark
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Old 08-09-2010, 12:10 PM   #2 (permalink)
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QUOTE (mlhankel @ Aug 8 2010, 11:21 PM)
Quote:
Just had a polaris tech do some motor work on my 07 600 CFI and he noticed that previous owner had put silicone between motor and exhaust manifold???? All the service work had previuosly been done by the local Polaris dealer. He thought it might have been because of oil leaking out and said he checked pistons and they looked good? Has anyone else done or heard of this? Is there something wrong to look for?

Thanks for the input!

Mark[/b]
Are you talking between the cylinder and the y-pipe or the y-pipe and the pipe. If it's between the y-pipe and the pipe there's a donut gasket and silicone isn't needed and there's a gasket that goes between the cylinders and the y-pipe. I put silcone between the pipe and the can.
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Old 08-09-2010, 05:48 PM   #3 (permalink)
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QUOTE (A05GSHO @ Aug 9 2010, 11:10 AM)
Quote:
Are you talking between the cylinder and the y-pipe or the y-pipe and the pipe. If it's between the y-pipe and the pipe there's a donut gasket and silicone isn't needed and there's a gasket that goes between the cylinders and the y-pipe. I put silcone between the pipe and the can.[/b]
There's silicone installed along with gasket between the cylinders and the y-pipe. He mentioned there is a gasket there as well so he was surprised by the silicone. Thoughts? Maybe a way to be cheap and keep the same gasket there w/o replacing?
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Old 08-09-2010, 07:23 PM   #4 (permalink)
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QUOTE (mlhankel @ Aug 9 2010, 04:48 PM)
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There's silicone installed along with gasket between the cylinders and the y-pipe. He mentioned there is a gasket there as well so he was surprised by the silicone. Thoughts? Maybe a way to be cheap and keep the same gasket there w/o replacing?[/b]
I've reused that gasket many times provided it didn't rip at all the guy may have put it on because he thought it was a good idea not needed though, it's not hurting anything. If I recall the 07 Cat I had, had no gasket and you just put high temp silicone on it.
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Old 08-09-2010, 08:06 PM   #5 (permalink)
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QUOTE (A05GSHO @ Aug 9 2010, 06:23 PM)
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I've reused that gasket many times provided it didn't rip at all the guy may have put it on because he thought it was a good idea not needed though, it's not hurting anything. If I recall the 07 Cat I had, had no gasket and you just put high temp silicone on it.[/b]
Ok thanks.
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Old 08-09-2010, 08:22 PM   #6 (permalink)
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QUOTE (mlhankel @ Aug 9 2010, 12:21 AM)
Quote:
Just had a polaris tech do some motor work on my 07 600 CFI and he noticed that previous owner had put silicone between motor and exhaust manifold???? All the service work had previuosly been done by the local Polaris dealer. He thought it might have been because of oil leaking out and said he checked pistons and they looked good? Has anyone else done or heard of this? Is there something wrong to look for?

Thanks for the input!

Mark[/b]

Most likely the old gaskets were damaged some when taken apart. I reuse gaskets all the time if they are not to far destroyed, a little goop is not going to hurt anything.


I goop the doughnut seal, and the pipe to can connection also.


What to be worried about is why the previous owner had it at the dealer, and why you had it at the dealer????????????
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Old 08-09-2010, 09:36 PM   #7 (permalink)
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QUOTE (alsled @ Aug 9 2010, 07:22 PM)
Quote:
Most likely the old gaskets were damaged some when taken apart. I reuse gaskets all the time if they are not to far destroyed, a little goop is not going to hurt anything.


I goop the doughnut seal, and the pipe to can connection also.


What to be worried about is why the previous owner had it at the dealer, and why you had it at the dealer????????????[/b]
I do the same. I also have a can of the spray gasket sealer that I spray on old gaskets if I am re-using them. Again little silicone isnt going to hurt anything. Might be bad if its missing the gaskets and they just used silicone and it was meant to have a gasket.

Keeping your exhaust as sealed as possible is crucial. Specially if you are running a modified engine and pipe. The slightest exhaust leak on my IQR w/800 VES (heavily ported and custom pipe) kills my power.
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Old 08-09-2010, 10:47 PM   #8 (permalink)
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QUOTE (alsled @ Aug 9 2010, 07:22 PM)
Quote:
Most likely the old gaskets were damaged some when taken apart. I reuse gaskets all the time if they are not to far destroyed, a little goop is not going to hurt anything.


I goop the doughnut seal, and the pipe to can connection also.


What to be worried about is why the previous owner had it at the dealer, and why you had it at the dealer????????????[/b]
I know a polaris tech who does work on the side for me.....he was replacing the fuel/oil filters, throttle body adaptor, and checking oil pump setting (which was way off which means the dealer didn't check that along with throttle body cable recall). Like a good mechanic should do he noticed there was silicone applied along with the gasket and told me.....he didn't think it was a big deal and I thought I would see if anybody else heard of doing that.
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Old 08-10-2010, 08:43 AM   #9 (permalink)
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I do it all the time, in fact sometimes i do it instead of a gasket. I did that on my 383 stroker chevy motor too, exhaust gaskets kept leaking cause the block heating up and cooling off even though i bought the expensive copper thicker gaskets, so i took them off and put high temp silicone on and it worked awesome, so this is not an uncommon practice in the auto industry

and my oil pump and clutch alignment were also off from the Manufacturer
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Old 08-10-2010, 09:29 AM   #10 (permalink)
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I have been doing the doughnut to y pipe and the pipe to can and also run a bead on all my exhaust springs for about 20 years now with red high temp silicon.It keeps them quieter so they don't vibrate as much and since I've been doing it I haven't had any break.Could be a coincidence.(also make them easier to see if you drop one down into never never land)
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