Hello Mooniacs !
During the last year I've had a lot of trouble concerning the carbon monoxide readings in the cockpit. We used additional to the small carbon monoxide cards a digital carbon monoxide detector. But it only appears during the climb, being in cruise it is absolutely no problem an the readings will decrase quickly.
Now, we are at a loss. We checked and double checked everything, but we are unable to find a solution for this problem. Even our maintenance shop has no idea anymore.
We carried out the following work:
- We removed and checked the heat exchanger around the muffler. There have been no visible cracks, but for to be sure we also removed during a test flight the heat ducting into the cabin. But it was without succes.
- We checked the complete exhaust system, from the cylinders to the tailpipe. Between the the muffler and the tailpipe was a leakage at the ball joint. There was a visible coverage of ash. We tightened the ball joint with a stronger spring kit and now it's absolutly leakproof. And again, it was ineffective.
- Because we don't have a one piece belly, we even taped the gaps at the belly with adhesive foil. We thought it is maybe possible that the carbon monoxide is entering the cabin by this way. Without any kind of result.
It's a '82 M20J, TTAF approximateley 2000hrs.
Do you have any idea, to explain or solve the phenomenon ? I think mooneyspace is the best platform to reach the absolutly best mooney experts. We are now at our wits' end.
Thanks a lot and best regards from Germany
Lukas