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Meanwhile, the lower turbo.
Stopped by the shop today and was shown where shaft was damaged on turbine side at the piston seal.
Since the shaft itself (borg warner turbo) is nowhere to find as part, and new BW turbo runs at $1,900 new, the shop is looking at fitting larger seal and match the shaft to it by machining the shaft.
That still does not explain why oil leaking from compressor side.
Or maybe it does. Since the piston seals are meant to hold gas/air from entering turbo housing (compressor or turbine side), could this widened piston ring allow exhaust gasses to enter the housing and mess with oil return, somehow forcing oil to escape through compressor side piston ring?
On the photo: notice wear/damage at on left side of the square groove.
The round groove is called "oil fling", meant to reroute oil away from piston ring. Again, the piston ring itself is meant to seal gas/air, not oil.
When oil gets there for any reason, the ring is not good at sealing it. Similar to charge air pipe seal that we all have experience with leaking oil.
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01-30-2018, 12:11 AM
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