GoDores

The exact same one that was on there, a lightweight Sky-Tec 149NL. Fortunately a pretty common model and the local shop had one, although it was $150 more than from Aircraft Spruce On edit: it failed on a Sunday night 600nm away from home - this wasn't a voluntary or preventive replacement. I was stuck.

Thanks for the help! We were able to get the mixture cable tightened, and that appeared to solve that problem - the knob stayed still over almost 10 hours of flying this weekend. Unfortunately it looks like the ram air cable will have to be replaced. Probably won't get to that for a little while, since we had to replace the starter this weekend

Thanks! We've tried tightening the front nut on the mixture cable but not after loosening the back, which sounds like it has the effect of pulling the cable out of the panel and thus increasing the tension on it. I'll try that this week. I'll also take a look at the ram air cable - hopefully we can remove and straighten it to fix the problem, but we need a replacement for $450 then I think it's worth doing. I know some people remove them, but when it was working correctly we got 1/2" of MP out of it. If I didn't want every last knot, I could be flying a 182 :-p

Thanks for the thoughts on the cable. Do you recall how many hours it took when you replaced your cable, or how difficult of a job it was? We do as much work as possible ourselves, supervised/assisted by our A&P.

I'm flying an '84 M20J, and over the past couple years it's developed two problems that aren't of major concern but that I'd like to find answers for. Our A&P hasn't been able to figure either problem out. 1) The ram air door no longer fully opens. The knob starts to pull out, but quickly becomes very difficult to pull, to the point where I'm afraid of breaking something if I pull any harder. I'd estimate the door rotates about halfway when the knob is pulled as far as I can pull it. There are no obvious problems when looking at the door mechanism with the cowling off. 2) The mixture knob will slowly turn clockwise in flight. Our A&P has tried tightening the knob from the outside of the panel with no effect. It seems to rotate to a given point and then stop. The vibration is in the direction that richens the mixture, never the other way. These have been bugging us for a couple years, so I'm hoping there's a fix other than "replace everything". Thanks!