Turbo or waste gate issue?

[PilotX]

19 hours ago, exM20K said:

This for sure.  my TSIO550 goes through them like they're free, which they are definitely not.  erratic readings is also another failure mode, but I agree, TIT and EGT will read colder and colder before they croak.

-dan

I'll look at the logs. Given that we have been flying at the same power settings (prior to a probe failure) it should have resulted in the same TIT but checking costs nothing.

Still waiting to hear from WS. Hope they get to it by today so it can get shipped off. Still on the ramp, they have not pulled it over yet. The dreaded "hopefully soon".

[LANCECASPER]

44 minutes ago, PilotX said:

I'll look at the logs. Given that we have been flying at the same power settings (prior to a probe failure) it should have resulted in the same TIT but checking costs nothing.

Still waiting to hear from WS. Hope they get to it by today so it can get shipped off.

If it was me I'd want to pull the oil filter and send it off for a more thorough analysis to look for metal from all of that scoring. If that metal ran through the engine very long there may be a lot more metal. Better to know on the ground than to find out in the air.

https://www.aircraftspruce.com/catalog/eppages/metalcheck2.php?clickkey=3075772

[PilotX]

Update today. Turbo removed, shaft is bent, should be rebuilt at the lower end of the quote window ~6100.

[Fly Boomer]

16 minutes ago, PilotX said:

Update today. Turbo removed, shaft is bent, should be rebuilt at the lower end of the quote window ~6100.

How does a turbo shaft get bent?  I can only imagine it got so hot, the structural integrity was degraded.

[PilotX]

11 hours ago, Fly Boomer said:

How does a turbo shaft get bent?  I can only imagine it got so hot, the structural integrity was degraded.

They didn’t say. Only anomaly…there was one mounting bolt that was inside the cowling. Surprised it stayed in the plane, appears that it worked its way out at some point and maybe a bump on landing or rough patch of the ramp caused it to drop out and cause some bowing in the turbo, even that seems implausible as the TIT at landing was 1100 and for the three minutes prior below 1300 during descent. We have reams of engine data and we run the turbo below 1650, generally around 1615, but again, I doubt we will ever know the “cause”. That bolt wasn’t there the week prior when it came out of annual though they did find the left (as you are looking at it) clamp loose, not the the one subject to the AD. Could have been a lot of vibration. Could have been a bearing failure that caused the shaft to shift causing contact with the side of the inlet causing a bend. Could have been space aliens.

[Fly Boomer]

7 hours ago, PilotX said:

Could have been space aliens.

Unfortunately, many of our problems come down to this controversial root cause. 

[Jetpilot86]

On 11/17/2024 at 2:16 PM, PilotX said:

I just looked through the logs, no indication of the age of the turbo (new/overhauled/swapped) from when the engine was installed in 2019. Is the turbo part of a factory overhaul? The governor is listed, the prop (belly landing) oil hoses, oil cooler, overhauled alternators, vac pump, starter.

Mine is a Lycoming Factory OH, they do come with new/OH'd (not sure which, but it comes with one) Turbo's.

[jlunseth]

Might check upstream in the air intake for a possible source of debris. A piece of something breaks off, hits the turbo, goes through, but the strike leaves a bend in the shaft?