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Rotax 912 exhaust springs going walkabout

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graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Tue Jan 03, 2012 12:49 pm Post subject: Rotax 912 exhaust springs going walkabout

During 'shake down' flights we twice lost an exhaust spring, both front, left then right, whether snapped or shaken loose, who knows. New engine, new springs, new exhaust - why should this be? Applied with a string not pliers, Anyone else had this? now wire locking but need more hours to see what happens.

Maybe its the stiffness of the new engine creating lots of movement on startup?

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_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk

ward.t(at)xtra.co.nz
Guest

Posted: Tue Jan 03, 2012 2:01 pm Post subject: Rotax 912 exhaust springs going walkabout

Graeme,

I was told to put some high-temp RTV Silicone gasket maker by Permeatex on the springs between the wires to absorb the shaking. Haven't had a problem with them. Don't know if it was due to the above application however they are still attached. I also lock wire the to the muffler to avoid the departure.



Cheers,



Tim



Tim Ward

12 Waiwetu Street

Fendalton,

Christchurch,  8052

New Zealand.



ward.t(at)xtra.co.nz



Ph 64 3 3515166

Mob 0210640221

On 4/01/2012, at 9:49 AM, "graeme bird" <graeme(at)gdbmk.co.uk> wrote:



 	  Quote: 	
		   

 

 During 'shake down' flights we twice lost an exhaust spring, both front, left then right, whether snapped or shaken loose, who knows. New engine, new springs, new exhaust - why should this be? Applied with a string not pliers, Anyone else had this? now wire locking but need more hours to see what happens.

 Maybe its the stiffness of the new engine creating lots of movement on startup?

 

 --------

 Graeme Bird

 G-UMPY

 Mono Classic/XS FWFD 912ULS/Warp drive FP

 Just Test Flying to obtain permit

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=362354#362354

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grahamsingleton(at)btinte
Guest

Posted: Wed Jan 04, 2012 12:44 am Post subject: Rotax 912 exhaust springs going walkabout

Graeme

check the holes in the tabs on the muffler downpipes. I've seen some very sharp corners/burring on them which cut through the spring hooks. I once spent half an hour deburring all the holes on one that I worked on.

Graham

       From: graeme bird <graeme(at)gdbmk.co.uk>

 To: europa-list(at)matronics.com 

 Sent: Tuesday, 3 January 2012, 20:49

 Subject:  Rotax 912 exhaust springs going walkabout

--> Europa-List message posted by: "graeme bird" <graeme(at)gdbmk.co.uk (graeme(at)gdbmk.co.uk)>

During 'shake down' flights we twice lost an exhaust spring, both front, left then right, whether snapped or shaken loose, who knows. New engine, new springs, new exhaust - why should this be? Applied with a string not pliers, Anyone else had this? now wire locking but need more hours to see what happens.

Maybe its the stiffness of the new engine creating lots of movement on startup?

--------

Graeme Bird

G-UMPY

Mono Classic/XS FWFD 912ULS/Warp drive FP

Just Test Flying to obtain permit

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=362354#362========================http://www.matronics.com/Navigator?Eurp;  -->

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tennant

Joined: 19 Apr 2011
Posts: 121

Posted: Thu Jan 05, 2012 12:52 pm Post subject: Re: Rotax 912 exhaust springs going walkabout

Hi Graeme,

Over 14 years I have replaced many of the stainless springs supplied with the kit. This all ended when I changed from stainless to galvanized springs. Since then no more breakages.



Just a tip.



Best regards



Barry Tennant

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Barry Tennant
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At EDLM - Germany

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