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Exhaust Gasket Installation Question

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dwight(at)openweave.org
Guest

Posted: Fri May 04, 2007 8:35 pm Post subject: Exhaust Gasket Installation Question

So ... again, I'm helping a friend install new exhausts on his RV-4,

and I have (yet another) question. The exhaust system came with a full

set of slow-blow gaskets. My understanding (potentially incorrect) was

that these were installed dry (i.e. without any sealant, goop, or goo).

Furthermore, no mention of sealant was made in the installation notes

from Vetterman.



However, upon pulling off the old badly rusted exhaust pipes it seemed

that the old gaskets .. which clearly were identical to what we were about

to install .. had some rubbery goo used on them.



To goo, or not to goo. That is the question. Are we supposed to use some

sealant? If so, what? Enquiring minds want to know. Thanks!



  -- Dwight

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pitts_pilot(at)bellsouth.
Guest

Posted: Sat May 05, 2007 3:43 am Post subject: Exhaust Gasket Installation Question

My info says dry.

Here it comes: BUT, those doing the blo-pruf installs may be trying to 

cover up eroded flange faces because the old, leaky, gaskets weren't 

replaced in a timely manner.  There is a tool that will face the gasket 

seat while the cylinder is still on the engine.

I just ran out of info.

Linn

do not archive



Dwight Frye wrote:



 	  Quote: 	
		  



So ... again, I'm helping a friend install new exhausts on his RV-4,

and I have (yet another) question. The exhaust system came with a full

set of slow-blow gaskets. My understanding (potentially incorrect) was

that these were installed dry (i.e. without any sealant, goop, or goo).

Furthermore, no mention of sealant was made in the installation notes

from Vetterman.



However, upon pulling off the old badly rusted exhaust pipes it seemed

that the old gaskets .. which clearly were identical to what we were about

to install .. had some rubbery goo used on them.



To goo, or not to goo. That is the question. Are we supposed to use some

sealant? If so, what? Enquiring minds want to know. Thanks!



  -- Dwight

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

dwight(at)openweave.org
Guest

Posted: Sat May 05, 2007 4:56 am Post subject: Exhaust Gasket Installation Question

Thanks for the confirmation on installing the gaskets. I sure

THOUGHT I remembered they were to be installed dry.



Any thoughts on how to _tell_ if the gasket seat needs to be 

re-faced?  Clearly if there is any obvious/visible erosion

that would be a hint ... but if they look un-damaged, might

there still be subtle/invisible issues to be addressed?



  -- Dwight



On Sat May  5 07:42:05 2007, linn Walters wrote :

 	  Quote: 	
		  




My info says dry.

Here it comes: BUT, those doing the blo-pruf installs may be trying to 

cover up eroded flange faces because the old, leaky, gaskets weren't 

replaced in a timely manner.  There is a tool that will face the gasket 

seat while the cylinder is still on the engine.

I just ran out of info.

Linn

do not archive



Dwight Frye wrote:



>

>

>So ... again, I'm helping a friend install new exhausts on his RV-4,

>and I have (yet another) question. The exhaust system came with a full

>set of slow-blow gaskets. My understanding (potentially incorrect) was

>that these were installed dry (i.e. without any sealant, goop, or goo).

>Furthermore, no mention of sealant was made in the installation notes

>from Vetterman.

>

>However, upon pulling off the old badly rusted exhaust pipes it seemed

>that the old gaskets .. which clearly were identical to what we were about

>to install .. had some rubbery goo used on them.

>

>To goo, or not to goo. That is the question. Are we supposed to use some

>sealant? If so, what? Enquiring minds want to know. Thanks!

>

>  -- Dwight

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Oldsfolks(at)aol.com
Guest

Posted: Sat May 05, 2007 5:58 pm Post subject: Exhaust Gasket Installation Question

I have used a good heavy coat of aluminum paint on exhaust gaskets to help  with heat transfer and maybe help to seal the joints.   I do this on  vehicles and on the RV-4 also.

  

 Bob Olds   RV-4

 Charleston, Arkansas



See what's free at AOL.com. 

  [quote][b]

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pitts_pilot(at)bellsouth.
Guest

Posted: Sat May 05, 2007 9:50 pm Post subject: Exhaust Gasket Installation Question

I've never had one so bad it needed professional attention, but a good inspection with a mirror and good light should show any damage.  It may just need some close inspection after the blo-prufs are installed.  The other problem is the exhaust flange.  The ears become bent after being installed by gorillas a few times.  Check with a straightedge.

 Linn

 

 Dwight Frye wrote:

 [quote]    	  Quote: 	
		  --> RV-List message posted by: Dwight Frye <dwight(at)openweave.org> (dwight(at)openweave.org)



Thanks for the confirmation on installing the gaskets. I sure

THOUGHT I remembered they were to be installed dry.



Any thoughts on how to _tell_ if the gasket seat needs to be 

re-faced?  Clearly if there is any obvious/visible erosion

that would be a hint ... but if they look un-damaged, might

there still be subtle/invisible issues to be addressed?



  -- Dwight



On Sat May  5 07:42:05 2007, linn Walters wrote :

        	  Quote: 	
		  --> RV-List message posted by: linn Walters <pitts_pilot(at)bellsouth.net> (pitts_pilot(at)bellsouth.net)



My info says dry.

Here it comes: BUT, those doing the blo-pruf installs may be trying to 

cover up eroded flange faces because the old, leaky, gaskets weren't 

replaced in a timely manner.  There is a tool that will face the gasket 

seat while the cylinder is still on the engine.

I just ran out of info.

Linn

do not archive



Dwight Frye wrote:



            	  Quote: 	
		  --> RV-List message posted by: Dwight Frye <dwight(at)openweave.org> (dwight(at)openweave.org)



So ... again, I'm helping a friend install new exhausts on his RV-4,

and I have (yet another) question. The exhaust system came with a full

set of slow-blow gaskets. My understanding (potentially incorrect) was

that these were installed dry (i.e. without any sealant, goop, or goo).

Furthermore, no mention of sealant was made in the installation notes

      	
     >from Vetterman.

            	  Quote: 	
		  However, upon pulling off the old badly rusted exhaust pipes it seemed

that the old gaskets .. which clearly were identical to what we were about

to install .. had some rubbery goo used on them.



To goo, or not to goo. That is the question. Are we supposed to use some

sealant? If so, what? Enquiring minds want to know. Thanks!



 -- Dwight

      	
     	
   





  	
 [b]

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aerokinetic(at)sbcglobal.
Guest

Posted: Tue May 08, 2007 5:40 am Post subject: Exhaust Gasket Installation Question

Some (including me) use silicone as a sealant around the blo-proof gaskets on the exhaust. It performs many functions and has no bad side-effects. Give them a healthy bead of almost any kind of silicone on both sides. Obviously the high-temp stuff sold as gasket sealant is probably best -but even the bathtub variety seems to be tolerant of high temps... just beware some are higher in acetic acid (which is why they are not recommended sometimes for use on aluminum). If it has a really strong vinegar smell then go get another variety.

   

  Anyhow...

   

  First, it holds the gaskets in place while the rest of the system goes up into place.

   

  Second, it lubricates the threads on the studs (smear a little extra all over the threads).

   

  Third, it seals any remaining leaks very well -and don't worry about the splooge inside the pipes -it will burn off and come out the  pipes leaving the inside flush and smooth.

   

  Fourth, it will keep the nuts from loosening and protect them, and the studs from corrosion. (smear a little extra bead around the tightened nut)

   

  Fifth, it will make your life much easier when it comes time to take the exhaust system off again. Just put your socket up there over the siliconed nut/stud and start loosening. The stuff will be ground up and cleaned off as you (easily) remove the nut.

   

  The stuff is BEAUTIFUL for exhausts!

   

  Scott

  N4ZW 

  (A&P FWIW -and did this on *many* airplanes I used to maintain)

   

 [quote][b]

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