Zenith Aircraft Builders and Flyers
Online Community of Zenith Builders and Flyers
EGT GEN 4
Have spent some time chasing an erratic egt gremlin. First indication was a noticeably lower egt than any other cylinder - chts looked normal. After a few more flights the egt started out low and on climbout went very high (1400+). Exhaust pipe inspection looked same as the others. Previous egt issues were fixed with a new sensor - all good. Went through 3 sensors, swapped leads, replaced entire egt wire/connectors to the pin in the DB25 (dynon ems/hdx). Dynon did an outstanding job working with me the whole time. Ultimately swapping a refurb ems to check the system. No change - same lo/high indications. Closer inspection revealed a break/crack in the sealant on the induction pipe from the carb manifold to the cylinder. Removed, cleaned, reseated/sealed pipe with Jabiru recommended Loctite gasket sealer #2. Check flight today - back to normal egts!!! Lesson learned - ensure to closely inspect the induction pipe seal. There is an O-ring in the manifold, but the seal can make a noticeable impact on the fuel/air mixture to the cylinder and the resulting egts.
- Attachments:
-
-
20230822_083804.jpg, 2.8 MB
-
Replies to This Discussion
-
Permalink Reply by Bob Simmons on
-
Thanks for posting this, James. Stuff like this is very helpful to folks coming here looking for answers/clues.
-
Permalink Reply by John Burns on
-
Awesome post. Thanks I will know to be watching for this.
-
Permalink Reply by Quentin Dunn on
-
Thanks for posting this! I've been chasing the same issue on my Gen3 cyl 5 and 6. Previously, I hadn't gone all the way back to the manifold to check for leaks. (didn't see any) Did this time, Took a deep breath today, pushed the throttle forward, and Tadaa! No more issues. Slowly working the bugs out of my recently purchased 601. And having fun doing it.
New from Zenith:
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:
Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz
Builder & Pilot Supplies:
Pro Builder Assistance:
Transition training:
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
