Turbo or waste gate issue?

[PilotX]

My partner is stuck in KMTJ. Can't get more than 23" of manifold pressure. Did a quick search but nothing definitive on MS or the net.

TTSMO is around 350, just out of annual, third flight of the day so while not definitive, not near 1000 hour expected turbo overhaul.

Probably not interested in flying at 23" over the mountains, if that is even partially safe. Our mechanic suggested tapping the waste gate controller, I am going to try to find a local A&P. Any initial thoughts?

 

[PilotX]

Well looks like the turbo has a chipped blade fin and isn't spinning smooth. 

[kortopates]

pull it off and send it to Gary at Mainturbo


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[PilotX]

9 minutes ago, kortopates said:

pull it off and send it to Gary at Mainturbo


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Think that is what we will need to do. Sunday is not the best day for this to happen. Thanks.

[kortopates]

If you want to expedite he can have an exchange or new unit ship out monday but sending in yours for repair is usually a lot cheaper but more than double the time.


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[Rick Junkin]

Careful with the v-band during removal!

[PilotX]

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.

[Fritz1]

put a wrench on the waste gates shaft and make sure it moves freely, lube waste gate shaft with mouse milk at every oil change, find out what was done during annual that might have anything to do with what you are experiencing, and while you are at it inspect turbo transition weld in exhaust with mirror from backside

[exM20K]

I would want to know where that piece of metal and the shavings from the blades rubbing the housing went. 

-dan

[PilotX]

Lot of questions. Plane is a couple hours away, by plane, so I will get somebody to pull it and overhaul it. It will either go to Main Turbo or Western Skyways, which is on the field. Certainly have to make sure there isn't any metal floating around, could be too late either way as it was run a couple of times after the issue was discovered but wouldn't get above ambient MP. I'll let everybody know.

[Steve Dietrich]

I think it really depends on where the engine came from .  

My recollection is that a reman engine 

 

- Where did the missing piece go   

- Is there other turbo damage 

- What caused the damage - stray metal in the intake ? 

If the piece can not be found in the intake system then probably borescope engine 

[Steve Dietrich]

second look at the photo - scoring apparent on the turbo housing potentially creating more metal in the intake.