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The carb heat dump valve duct is routed to the left exhaust cavity. I think the blue print LASAR includes with the carb heat rebuild kit shows that in better detail than the IPC or mx manuals. The actual routing isn’t critical, though, as long as the hot air is dumped overboard.

Or, LESS DOORBELL! We had a pilot at Beale, ‘Mango’. His Christopher Walken impression was spot-on. ‘More cow bell’ was a running joke in the office.

Avionics list: Century 41 AP (Flight computer ID757-1001004; Trim servo 1C373-6-807; Roll Servo 1C508-1-523R; Pitch Servo 1C812-2-8010 GPSS Controller/adapter 1C975; GPSS switch 1C977-1. Attitude Gyro(Edo Aire)1U367-004-4; Directional Gyro1U262-014-4 Shadin Fuel Flow Indicator 912041T-D. Garmin GI 106A Indicator. EI Engine Analyzer System UBG-16 We purchased a Mooney 231 late last fall and have since upgraded the avionics. We flew the airplane approximately 50 hours before the upgrade and found these avionics performed very well. I'm not familiar with the used avionics market although the 430W we had sold immediately. I'm curious as to the marketability of this list of avionics and the best source to advertise them. Thanks. Kent Taylor(701-770-6739)

@Tommooney best price I've found: https://www.scross.com/store/part-number?10-900-60-1

I am looking for replacement static wicks. I ordered from Spruce and they came 6' long. The originals are 4" long. Suggestions appreciated.

Not a valve issue. Thanks for input. I have an edm830. I looked.

Hi 1966 M20C Mk 21 owners! I have been breathing new life into a bird that has been sitting for a while. I have an issue which might be really easy to resolve if there is an owner out there with the same model. I am looking for the routing of 1 ¼” Scat tube from the left side of the carb heat / air intake box on the 1966 M20C Mark 21. I have an illustrated parts manual that covers the 1966; however, the illustrations for that view are for 1967 and later where the exhaust system is different. I am thinking that either an owner who has pictures could show me the routing oor possibly the service manual specific to a 1966 M20C Mk21 might have a technical drawing of the routing. I can’t seem to find anything out on the web that I can download even at a fee. If someone could provide a lead I woould be most appreciative. Thanks - Chris

I would like to point out something that I don't think as been mentioned, take a look at the barrel connector, behind pilot side panel. In my 75 F the connector was corroded, causing that behavior with an additional issue of power shorts. Connectors need to be inspected every so often as well

If you overprime an IO-360, it runs a little rough for a few seconds after starting. But if it is REALLY rough then it’s more likely a sticking valve. If you have an engine monitor, it’s easy to see which cylinder is dead because the EGT won’t come up. If you don’t have an engine monitor, start it with the cowling off an then shut down and feel which cylinder is cold.

Most likely, it’s a later model K since it has the relays and the three position flap switch with the 15 deg. position. Since the relays have been replaced, it must be a switch causing the problem. Within the box that contains the relays are two microswitches that control the 15 deg position. The schematics can be found in service and maintenance manual. Someone posted this simplified version a while back. Flap switch logic.pdf

As has been stated here before, what are our options. Mooney has been for sale for some time and no one has stepped up. I was in the factory early July '25 and based on what I heard I was thinking the last days were very soon. The Lasar guys are taking a risk and I am hoping they are successful. We need a dependable parts supplier as well as new energy injected into this once great company. And we need some damn swag too. lol I've only owned my O3 for 4 years. I was led to believe Mooney was owned by a group of Mooney owners. It was all BS. Its owned 80% by an investor and 20% by the Chinese company. The communications in the last 4 years has been non existent. I've seen more communication from the Lasar team than I ever have from past owners. In my opinion, I know like belly buttons, we all have one, Mooney never financially succeeded in large part to not having any what its costs were, hence the multiple bankruptcies. I would love to see new birds rolling off the production line, but that's probably not in the cards. Personally I want to invest and help these guys succeed, be a part of the story. I have spoke to Brett and I like what I am hearing. Owning a Mooney is special fraternity of brothers and sisters who share a passion for flying faster.

I know the mags have been on and off and thus timed. I think your engine timing is 22+/-1. Your timing can be in limits, but have a 2degree split and get different mag drops. If the timing is a little out of tolerance it becomes more significant. Using the timing cone is not the most precise thing. I know it’s sometimes hard to ask the mechanic these questions, but perhaps ask him what the mags are timed at…..or suggest retiming them both to 22 or 21? It might be that the left mag is clocked in such a way that it prefers more advanced and is causing these issues. Just seems consistent with timing….

Nice!

Could be the switch; could be the relay. Hard to tell which if intermittent. You could replace both to be certain. Or you could start by replacing whichever is cheaper.

The OP said he has a McCauley prop. Those get greased only when taken apart. There are no external grease points like a Hartzell prop.

Here's some info I got today. The Left mag side is definitely hotter. I did the inflight mag check as well. At first I ran it out to LOP and it was in the high 1400's. When I did the Left check, everything immediately went off the scale. The ships single EGT gauge went way past redline so I quickly backed out of that. I went richer with the mixture and got a lower base EGT and ran the same check. The right side was smooth and normal. All EGTS rose some but nothing drastic and the engine was still smooth. The Left EGTs took off in different directions and the engine got rough. I had video and at the bottom is a screen shot just before the mag check, the second screen shot is 4 seconds after turning the key.

Yep. I knew hot starts were very different; this thread points out that ALL starts are very different between the O- and the IO engines!

That’s a very nice and well thought out new panel! Congratulations!

You know the O-360 and IO-360 are very different to start.

I’ve started them in zero degree F weather like that.

If you prime an IO-360, you will fill one cylinder with fuel, maybe. The rest just goes into the sump. If the sump is cold, it will just sit there or drain out the sniffle valve. Once you have fuel pressure, the injectors will provide a perfect mixture for starting. Why mess with it.

Well, THAT is a new one. Start cranking with full rich on a cold engine.

I always start IO-360s the same no matter what the temperature. It never fails. Mixture rich, throttle at ~1000 RPM setting. Crank the starter, if it isn’t making fuel pressure, I’ll turn on the boost pump until I have fuel pressure, then turn it off. The only time I prime is if I think it is flooded, I will prime to make sure it is flooded, then do a flooded start. Hot start is mixture ICO, throttle 1000 RPM, crank till it starts, then advance the mixture. Flooded start is the same as hot start, but with more throttle. When it finally catches, reduce the throttle and when it starts to die, advance the mixture.

One thing for sure… if you have learned to use a certain amount of prime in warm weather… and the temps have cooled a bit… less prime won’t make any sense (to a chemical engineer). 100LL is known for its inability to evaporate as temps cool… the IO550 uses 40°F as the cut-off from normal start to cold start… where additional seconds of prime are used… and running the fuel pump on Lo to keep it running for a few more seconds… read up on various starts to understand them better… as a flooded start may be in your future… Best regards, -a-

All I've ever seen in my Mooney is 0; even my old Ford Ranger showed 0 running the heater in winter. I even checked my gas stove, oven and gas logs in the fireplace--all read 0 in steady use, with an occasional startup reading as high as 6. Any reading of 440, much less 800, requires investigation. Check sealing around all hoses and wires through the firewall, sealing around where rudder pedals and aileron rods leave the cabin, along with the seam tape under the cabin.