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Curious as to the 'hardness' of delrin compared to phenolic...will it wear as well/last as long? My recollection is that phenolic is pretty hard material.

You could measure the diameter and grip to determine the AN or MS part number for the bolt and then a search of the IPC will show where that bolt is used.

Just put some on the top of the center stem under the retention collar.

To test for a spun bearing, pull the prop forward, then push it backwards. You should feel the crank move about 0.020”. This is the thrust clearance of the crank and bearings. I’ve been told by an old A&P (humm, what and I) that if a bearing has spun, it won’t move for and aft. Could just be an OWT.

If the bearing spun it likely would show up on oil analysis. What is that telling you?

Are you trying to tell me something Mike?! . I get enough of that from my doctor.... On a serious note, I try to get the two-mile aircraft move done as quickly as possible since I usually do it during business hours and need to get back to work right away.

This is the replacement with LEDs from EI: https://iflyei.com/product/r-1-rpm-tachometer-instrument/

I'd further make the point that the plane flew for a while with the through-bolt loose...so, if the bearing has spun then the crankshaft has already been compromised. Therefore, I don't see much added risk to now replace/tighten the through-bolt and ground-run the engine aggressively. IOW, the odds that the bearing spun JUST before the plane was last shut-down without damaging the crankshaft, and now after tightening the through-bolt the previously spun bearing will now damage the crankshaft seems pretty unlikely.

It looks a bit like a brake caliper bolt but not sure how it would have ended up near your nose wheel. It may not have been from your aircraft but you might want to take a look at your left and right main wheels to see if the calipers are missing any bolts (and are safety wired). Otherwise if you still think it was deposited from your aircraft I’d remove the top and bottom cowlings and see if any of your engine accessories are missing mounting hardware.

Ok, this was a ridiculous post and I apologize. It’s obvious I misread the plug wires or it would not have run on one mag (3 cylinders). Even with my newly cataract free eyes, I can make mistakes. Good news is we had 2 successful hot starts. I’m reminded of a captain I flew with once who made a lengthy p/a to the passengers but mistakenly picked up the wrong mic and broadcast it on comm one. Before he finished he realized what he was doing and continued by saying to his audience of airline pilots “ I’m just going to hang up now and take off my headset, so make all the comments you want, I’m not listening “ Ya’all have a great day!

Hello, 1990 Mooney M20J. Just flew home from my annual and after I parked the plane and shutdown, a linesman at the ramp told me there was a screw on the ground, right under the exhaust. I cannot be sure it wasn't already there at the ramp but also, I want to know where it came from. The screw looks broken and was kind of coated in some lubricant. It wasn't hot like it had fallen from the engine but it was warm to the touch (it's a sunny day and the ramp had no shadows). I'm trying to get an A&P to come see the plane but wanted to check with the experts here if anyone would have a guess. I have an important work commitment so I couldn't stay at the airport and uncowl the engine to take a look around. Any thoughts? My guess is that, if this screw came from my plane, it could only have fallen from the nose gear area or somewhere over the RH cowl flap. Thanks

Mine goes in Monday for the AeroCruze…hopefully it goes as smoothly… -Don

Are you sure the harness was installed correctly?

Monday she goes in for the AeroCruze! Getting everything ready. Last days of no autopilot! -Don

Some do that on experimentals just to get better starts. It's not a bad idea other than adding a little complexity. I don't think it has much to do with whether it's fuel injected or carbureted. That sounds very unusual. It's fairly common to have one mag fire the top on one side and the bottom on the other, but, as Hank mentioned, you'd lose redundancy if a mag fired only one side (which sounds like it'd take a special mag, anyway).

The firing order is weird. When I lost a mag in flight, I'm really glad that all four cylinders were still running, not just two of them. Only lost a little speed, reached my destination and called the local A&P.

Yep, but the plant closed and there went my access to a metal lathe. As long as I can buy the right OD (7/8"), drilling and cutting off won't be too difficult.

Cutting deltrin is a lot more like cutting metal than cutting wood.

No. Drill them on the lathe, you'll get right down the middle that way. Once I get home, I'll be delrin shopping and playing with my wood lathe.

I came out of annual once from a Florida MSC and they told me they adjusted the preloads...I could not get the gear down unless I used both hands and very slow airspeed. Also I was not convinced it was not going to pop out of the holder if I did not roll it on or if I hit a bump. I got back on the ground and asked if they swung the gear after adjusting it and I literally got a shoulder shrug indicating they did not know and could not find out....Also they did not know how to fix it. So I took it to a non-mooney mechanic who was not to proud to call LASAR and it was fixed in 15 minutes.....this is also when I found my oil cooler with just hand tightened loose connections. The MSC told me my oil leak was just residual from the oil change....

The next time the engine comes up to full temp it'll drive any moisture out of the oil. If it's going to be run at temp soon, it's probably not an issue. If it's going to sit a long time, maybe. Just sitting can introduce water into the oil from condensation on the case, anyway.

Gloom, despair and agony on me . . . At least my CFII was attractive.

I don't think the originals were delrin, they may have been some sort of phenolic or something like that. Delrin is definitely a good choice for a modern replacement material, though, and, yes, delrin can be cut on a lathe.

That's actually not bad. I'm kinda surprised it did that good of a job. It's probably as good as most people would do just base on a problem description and not touching the airplane.

Thank you Yes the sensor pickup is on the mag.