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Exhaust System tension springs

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huckleberry1

Joined: 14 Nov 2011
Posts: 1

Posted: Wed Mar 06, 2013 6:53 am Post subject: Exhaust System tension springs

Hello,  

   

I am building a Rans S7 and now installing the 912ULS engine.   

My question regards the springs that hold the various exhaust system parts together that came with the Rans kit; they are bronze color and are 2 7/16” long and very stout. It took myself and another grown man to pull the springs open enough to capture the welded loops on the pipe.   

With the used 912ULS I purchased came a silver spring 2 ¼” long that has much less tension when pulled open; I can connect exhaust parts by myself.  

So my specific question is what are these two springs? I would like to order more of the silver version (I only have eight and need four more) but don’t know what to specify or where to get them.  

   

Thanks,  

Bill Stevenson  

Horseshoe Bay, TX  

Rans S7, 912ULS  

       [quote][b]

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Wed Mar 06, 2013 8:55 am Post subject: Exhaust System tension springs

Someone suggested the easy way to handle those  springs is to loop some safety wire around the hook and clamp the ends together  using a vise grip pliers. Pull and the spring opens easily with no danger of  busting your knuckles. I tired that method and it works great. Not my idea, but  another pilot's good suggestion.

  

  

 [quote]   ---

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Wed Mar 06, 2013 10:34 am Post subject: Re: Exhaust System tension springs

I use a pair of 12" long needle nose pliers. Grab the spring and use both hands and lean into it and use your weight instead of your wrist and forearm. The springs from CPS (original Rotax springs) are less stout than a few aircraft MFG's. They are easier to install and work just fine. Don't forget to safety wire them and applie high temp silicone as per Rotax.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

williamtsullivan(at)att.n
Guest

Posted: Wed Mar 06, 2013 12:01 pm Post subject: Exhaust System tension springs

I use a Phillips screwdriver.  Slide it through the spring hook, then put the tip on the welded loop.  Push on the handle, and the hook will slide down the screwdriver shank, right into place.  We used this trick on heavy truck brake return springs.

                                                       Bill Sullivan



--- On Wed, 3/6/13, Roger Lee <ssadiver1(at)yahoo.com> wrote:

 	  Quote: 	
		  

From: Roger Lee <ssadiver1(at)yahoo.com>

Subject:  Re: Exhaust System tension springs

To: rotaxengines-list(at)matronics.com

Date: Wednesday, March 6, 2013, 1:34 PM



--> RotaxEngines-List message posted by: "Roger Lee" <[url=/mc/compose?to=ssadiver1(at)yahoo.com]ssadiver1(at)yahoo.com[/url]>



I use a pair of 12" long needle nose pliers. Grab the spring and use both hands and lean into it and use your weight instead of your wrist and forearm. The springs from CPS (original Rotax springs) are less stout than a few aircraft MFG's. They are easier to install and work just fine. Don't forget to safety wire them and applie high temp silicone as per Rotax.



--------

Roger Lee

Tucson, Az.

Light Sport Repairman - Maintenance Rated

Rotax Repair Center - Heavy Maint. Rated

Home 520-574-1080  TRY HOME FIRST

Cell 520-349-7056





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rampil

Joined: 04 May 2007
Posts: 870

Posted: Sat Mar 09, 2013 4:23 am Post subject: Re: Exhaust System tension springs

To answer your question Bill,

The correct springs are the very stiff bronze ones. The silver springs

sound useless in the exhaust application. The tension is needed to

allow the exhaust flexibility but to remain seated during the shake on

startup and shut down.



Ira

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