Exhaust System
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Exhaust System
11A is in for its first annual since I purchased it...a few surprises along the way. Tube from L muffler to carb heat box had quite a bit of exhaust residue in it...which led to the discovery that the shroud seals are missing on both mufflers. I now need 4 each 0550157-9 and 1 each 0550157-30 and 0550157-31. Any ideas on where to source? There is also a small crack on the right muffler--any recommendations for welding shop? The crack is on the end of the right muffler, near where the curved exhaust pipe enters. Thanks in advance!
Varel Freeman
170B N3211A
195 N195GW
PA31 N508Y
170B N3211A
195 N195GW
PA31 N508Y
- cessna170bdriver
- Posts: 4082
- Joined: Mon Apr 22, 2002 5:13 pm
Re: Exhaust System
I highly recommend Aerospace welding in Minneapolis for the welding. The seals show up in their catalog too.
http://awi-ami.com
http://awi-ami.com
Miles
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
- Bruce Fenstermacher
- Posts: 10340
- Joined: Tue Apr 23, 2002 11:24 am
Re: Exhaust System
Varel, the seals aren't really a seal in the way we normally think of a seal. They more or less take up a space but they hardly seal. They are made from a soft lead like material. They lay around the inlet pipes and for the most part space out the baffling from the actual muffler. Many many aircraft are found with no seals. We've had discussion elsewhere how many of us might make our own seals by cutting slices of something like a aluminum pipe.
I like AWI and might turn to them. They have supported our Association in the past and make a quality product. I've also used Knisley Welding Inc.
I like AWI and might turn to them. They have supported our Association in the past and make a quality product. I've also used Knisley Welding Inc.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
- Joe Moilanen
- Posts: 601
- Joined: Sun Dec 28, 2003 5:45 am
Re: Exhaust System
I just sent my entire exhaust system to AWI for scrutiny while I major the engine. I should have a report on their work in a couple of weeks (hopefully a good report).
Joe
4518C
Joe
4518C
Re: Exhaust System
Thanks, Gentlemen. I'll call AWI Monday.
Varel Freeman
170B N3211A
195 N195GW
PA31 N508Y
170B N3211A
195 N195GW
PA31 N508Y
- cessna170bdriver
- Posts: 4082
- Joined: Mon Apr 22, 2002 5:13 pm
Re: Exhaust System
Yes, the "seals" are probably better described as spacers, but they do cut way down on leakage, and the IPC calls them seals. The material is aluminum.Bruce Fenstermacher wrote:Varel, the seals aren't really a seal in the way we normally think of a seal. They more or less take up a space but they hardly seal. They are made from a soft lead like material. They lay around the inlet pipes and for the most part space out the baffling from the actual muffler. Many many aircraft are found with no seals. We've had discussion elsewhere how many of us might make our own seals by cutting slices of something like a aluminum pipe.
I like AWI and might turn to them. They have supported our Association in the past and make a quality product. I've also used Knisley Welding Inc.
I recently bought an overhauled right muffler for my late B-model airplane from AWI. Maybe Del can post a photo to give an idea of the quality of their work.
Miles
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
Re: Exhaust System
An update--my muffler was not repariable, so a new one is on the way from AWI. They thought they had the seals (although at about $150 each including core charge!!) but turns out they did not have any. They are working on PMA for replacements, though.
Looking forward to the "new muffler"...under $500.
In checking logs, I realize they did a repair on my Navajo which burst an exhaust pipe 5-10 years ago. It was good work and has held up well.
Looking forward to the "new muffler"...under $500.
In checking logs, I realize they did a repair on my Navajo which burst an exhaust pipe 5-10 years ago. It was good work and has held up well.
Varel Freeman
170B N3211A
195 N195GW
PA31 N508Y
170B N3211A
195 N195GW
PA31 N508Y
Re: Exhaust System
The new muffler arrived today...looks great for $392.00
There is very little space between intake and exhaust risers...I noticed today that the clamps on exhaust have been rubbing into the intake risers, and there is some noticeable wear on the intake risers. The plane has the later model clamps with 2 rather than 4 bolts. Are there any tricks to getting better clearance?
There is very little space between intake and exhaust risers...I noticed today that the clamps on exhaust have been rubbing into the intake risers, and there is some noticeable wear on the intake risers. The plane has the later model clamps with 2 rather than 4 bolts. Are there any tricks to getting better clearance?
Varel Freeman
170B N3211A
195 N195GW
PA31 N508Y
170B N3211A
195 N195GW
PA31 N508Y
Re: Exhaust System
BTW, the new muffler is a PMA'd part, not an overhaul.
Varel Freeman
170B N3211A
195 N195GW
PA31 N508Y
170B N3211A
195 N195GW
PA31 N508Y
- Bruce Fenstermacher
- Posts: 10340
- Joined: Tue Apr 23, 2002 11:24 am
Re: Exhaust System
There is no secret. They are all very close and most have rub wear somewhere. In many cases you will have to fool around swapping clamps and clamp positions just to get the best situation with the least rubbing. And when your done, it will leak. It is the nature of the beast.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Exhaust System
Thanks Bruce. Another reason to look carefully under the hood from time to time! The thought of a cracked or broken intake riser next to that hot exhaust commands respect....
Varel Freeman
170B N3211A
195 N195GW
PA31 N508Y
170B N3211A
195 N195GW
PA31 N508Y