During a pre-flight inspection I noticed what appeared to be exhaust stain on the inside of the cowling.  It looked to be adjacent to where the 3 left exhaust stacks plug into the muffler.

Right side does not show any stain.

Stacks are fully inserted into the muffler up to the welded-on stop.  No obvious cracks or holes in the muffler.

Has anyone else experienced exhaust leakage in this area?  If so how to fix as there are no gaskets at this joint?

Thank you.

Grant Ziebell 

Views: 194

Reply to This

Replies to This Discussion

Hi Grant,

This is a common problem - I tried various sealing methods including exhaust/muffler sealant, etc., but they all burn out and blow out rather quickly.  When CAMit (the alternative Jabiru manufacturer) was in business, they sold a seal kit which I installed and it works pretty well, but unfortunately, CAMit went out of business and I'm not aware of any other source:

If it is not damaging the cowl due to heat, you probably just have to live with it.  If it is blistering or damaging the cowl, then I'd apply some sort of reflective heat barrier to the inside of the cowl (such as used to protect against heat from catalytic converters, etc.) to protect it.

John

N750A

Grant, I am having the same problem with mine, same side.. So far it has just blown a bunch of black soot on my cowling and oil cooler.. I was running very rich for a while and it really made a mess.  I have re-jetted and things are much better. I tried removing the exhaust springs and tightening up the fit, without much luck. Like John says, guess we just have to live with it.. Other than that I am loving my Gen4 3300, I have a little over 110 hours on it and she is running great.. Happy Flying, 

John W.

N10477

John,

I am going through the same re-jetting.  What did you finally end up using for main jet and needle jet?

Apparently there has been at least some success with using a Sonex exhaust. The premise is that it produces less back pressure, being straight. It doesn't eliminate the problem, just reduces it.

http://eaaforums.org/showthread.php?3568-Sonex-Jabiru-3300-Exhaust-...

RSS

New from Zenith:

Zenith Planes For Sale 
 

Classified listing for buying or selling your Zenith building or flying related stuff...


Custom Instrument Panels
for your Zenith
:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, Dynon and Garmin avionics, and more.


Zenith Homecoming Tee:


Zenair Floats


Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz


Builder & Pilot Supplies:

Aircraft Insurance:

 
 

West Coast USA:

 
Pro Builder Assistance:

 

Transition training:

Lavion Aero

K&S Aviation Services

Aircraft Spruce & Specialty for all your building and pilot supplies!

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

© 2024   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service