Kelpro999

Thanks for the reference material. Loose bearings definitely add one more axis to the failure mode, then again preload does increase pressure loading at a location none is desired.

This type of failure was very prevalent in semi trailer hubs while transported via rail. Our planes are subject to continuous vibrations while parked. This leads to false brinelling that looks like rust. This corrosion leads to vibration when in use. Vibration may be slight and masked by normal operations but very damaging to the delicate magnesium or aluminum cast rims utilizing thin profile bearings. I have nothing to prove this other than decades of observation. If our gear was parked on continuously moving treadmills then bearing and hub damage or tire deformation would be a thing of the past.

A little Deoxit d5 spray works magic with switch contacts

Given the cost of a new tire and the finicky nature of a Mooney’s front end. Using retreads ? Just the unknown radial force variation alone would steer me towards new.

popsicle sticks work well

Perhaps you’ve identified a Cirrus weak point. The scuppers and lower vents on my C had 63 year old paint with no fuel related deterioration. I’ve spilt plenty there over the last 10 years.

With the lack of blue dye and being an exterior low point this is a fairly bold statement. Other possibilities can include a concentration of other contaminants before, during and or after paint was applied then subject to time or other environmental factors.

And after that , go around the crankshaft up to the top from one end to the other.

My concern from the beginning

We all have open atmosphere ventilation on our tanks. Combine that with nearly empty tanks when parked a month outside. My mind won’t let go of one of those videos showing the viton o-ring growth, that’s what our tank sealant top coat is.

I wonder if the dye or tetraethyllead left behind during evaporation of 100LL is providing a protective barrier that g100ul does not possess?

If you’re in the San Diego area WE could do it but these are much too delicate to loan out.

This does look ok when all compounds are ready to use state, however the reality is all aircraft have fuel cells subject too evaporation and absorption that are continuously changing concentrations of elements.

If you look at the way all the failures appear you’ll notice the top coat has expanded to the point of being way too large to lay flat. This has nothing to do with underlay although the substrate is responding same.

You might try rolling trim back to approximately where you notice issues then lift and push down the stinger with some force and observe.