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Exhaust Spring

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Rich L

Joined: 23 Feb 2008
Posts: 63
Location: North Idaho

Posted: Wed Jun 18, 2008 4:22 am Post subject: Exhaust Spring

I have problem with spring wear on the exhaust on my S-7.  I have worn through three springs and the stainless steel spring tabs on the manifold are starting to get a groove in them.  Anybody know of any fixes for this?

Thanks all.

Rich

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temco(at)telusplanet.net
Guest

Posted: Wed Jun 18, 2008 6:34 am Post subject: Exhaust Spring

Rich



The exhaust springs wear because of the vibration. Put a bead of high

temperature RTV length wise down the spring from one contact point to the

next. This helps to deaden or damp out the vibration in the spring and

lessens the movement at the two spring ends where they contact the stainless

steel tabs.



Ted Palamarek

Edmonton, Ab





To: kitfox-list(at)matronics.com

Subject: Exhaust Spring






I have problem with spring wear on the exhaust on my S-7.  I have worn

through three springs and the stainless steel spring tabs on the manifold

are starting to get a groove in them.  Anybody know of any fixes for this?

Thanks all.

Rich





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http://forums.matronics.com/viewtopic.php?p=188451#188451

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kitfoxmike

Joined: 05 Dec 2006
Posts: 373

Posted: Wed Jun 18, 2008 9:29 am Post subject: Re: Exhaust Spring

I got tired of my springs breaking, so I safety wired them.  Just do a loop at one end wrap it around both ends several times keeping it tight, then spiral it around the whole thing down to the original start, then end up with another tie at the original start.  My final spring wore out, I didn't catch it and caused a crack in the exhaust about 3 inches, I removed the spring, welded up the crack and wire tied that also.  I haven't had any issues with using safety wire, been using this for about 600hrs.

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gary.algate(at)sandvik.co
Guest

Posted: Wed Jun 18, 2008 3:47 pm Post subject: Exhaust Spring

With the 2 stroke engines this used to be a constant concern due to high vibration levels - easy fix was to run a bead of Red HT Silicon down the length of the coils to dampen vibration. On pusher set ups we used to also run a safety wire down the center of the coil and then loosely back up the outside and through the exhaust tabs each end. Then we siliconed the lot. That way should  a spring fail the whole thing was held captive and retained on the muffler. Otherwise they would hit the prop and things could get very quiet very quickly. Since I started used the silicon I never broke a spring. 

 

Gary

 

 Gary Algate

 Classic 4 Jab2200

 Office Phone: +61 8 8276 7655

 

 

  [quote][b]

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