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Exhaust loose

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fishface68

Joined: 26 Apr 2016
Posts: 22
Location: uk

Posted: Wed May 09, 2018 1:32 pm Post subject: Exhaust loose

I am having some issues tightening up the exhaust clamp on No1 cylinder. It was very loose to the point that I thought the C-ring (doughnut) had disintegrated. I got the exhaust segment off without any issues and I have tried reassembling with a new C-Ring but it is still really loose? When i tried to tighten the flange the threaded part started to turn so now I need to re-peen the threaded part to the cylinder. Any advise on how to get it all back together would be much appreciated.

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dougsappllc(at)gmail.com
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Posted: Wed May 09, 2018 2:10 pm Post subject: Exhaust loose

Yours is a common problem caused by the steel exhaust donuts rattling around causing the aluminum exhaust port to "bell" out.  Not much can be done other than welding and machining or replace the cylinder, the latter may be the lowest cost fix..  Exhaust ring nuts should be snugged up at every conditional inspection.



Doug

On Wed, May 9, 2018 at 2:32 PM, fishface68 <patrick.chriswick(at)gmail.com (patrick.chriswick(at)gmail.com)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: "fishface68" <patrick.chriswick(at)gmail.com (patrick.chriswick(at)gmail.com)>

 

 I am having some issues tightening up the exhaust clamp on No1 cylinder. It was very loose to the point that I thought the C-ring (doughnut) had disintegrated. I got the exhaust segment off without any issues and I have tried reassembling with a new C-Ring but it is still really loose? When i tried to tighten the flange the threaded part started to turn so now I need to re-peen the threaded part to the cylinder. Any advise on how to get it all back together would be much appreciated.

 

 

 

 

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BTLYak

Joined: 02 Dec 2015
Posts: 22

Posted: Thu May 10, 2018 5:42 am Post subject: Re: Exhaust loose

Doug is spot on.



We just went through the same problem. Here is what we did;



1. Remove cylinder, ours was #1 so it wasn't terrible difficult. Tedious to get all the small parts, air start lines, baffles, oil lines etc. out of the way.

2. We sent it to M-14P, Jill reworked exhaust port. She also had to replace a valve and guide.

3. Reinstall cylinder with new bolts, lock plates, and o-ring. Set all valve clearances, run and leak check.



Cost: ~$1,400 for parts and repairs (at)M-14P.

Labor: 4-6 hours if you do it yourself.

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_________________
"Battle Yak"

HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Thu May 10, 2018 6:04 am Post subject: Re: Exhaust loose

We had the same issue on our Yak. Pulled the two cylinders and sent them to Mike at SuperFinishers in Phoenix. (The airplane is in Phoenix.) I cannot remember the cost but it was not huge. 



Mike, the owner, is a Yak owner. 



http://superfinishersinc.com/

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fishface68

Joined: 26 Apr 2016
Posts: 22
Location: uk

Posted: Sat May 12, 2018 3:07 pm Post subject: Re: Exhaust loose

Many thanks for the posts and advice. I have fitted an oversized doughnut for now. I am not convinced it will last too long so i am on the lookout for a spare cylinder if anyone has any leads on a good one?

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