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ANOTHER broken exhaust tube

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Tue Jun 20, 2006 2:41 am Post subject: ANOTHER broken exhaust tube

This pertains to the older (not stainless steel) exhaust system on the 

Allegro 2000 w/ 912 series engines.



The #3 exhaust tube broke near the upper weld at the bottom of the 

elbow a bit below the EGT thermocouple, in less than 50 hours after 

replacing this part due to it happening before. We welded up this break 

and it happened again in less than 50 hours. We decided to support this 

side of the heavy muffler to reduce or eliminate the vibrations that 

were leading to this endemic failure. Less than 10 hour after that, the 

#4 exhaust tube broke in the identical place. It appears that the 

stresses we relieved by better supporting the #3 side moved to the #4 

side. Law of Unintended Consequences is alive and well.



This is obviously a faulty design or more likely wrong use of materials 

which succumb to vibrations too easily. The welder that did the repairs 

said he had never welded this type of steel before and suspects it was 

some sort of spring steel which he had never seen used in an exhaust 

system before.



Fortunately, as most of you who have bought newer Allegros know, a 

newer stainless steel exhaust system is not standard on the Allegro. 

After having replaced both landing gear legs we had hoped to avoid 

having to replace the  exhaust system too but we have no choice at this 

point.



I hope that the stainless steel system will solve this problem. Have 

any of you had this sort of problem with the stainless steel system?



Thom in Buffalo

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_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Wed Jun 21, 2006 3:09 am Post subject: ANOTHER broken exhaust tube

Ooops!!



It appears I said "... is not standard" when I meant to type ".... is 

NOW standard". Sorry for the typo.



Thom in Buffalo

- The Matronics Allegro-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?Allegro-List

_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

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