Erich

I rebuilt both my IHI turbos (5.0 mustang, twin IHI turbos) since one was oil leaking badly on the compressor and turbine sides. The other one seemed pretty good but I rebuilt it anyway. So I put both turbos on the headers and ran the car without the turbos hooked up to either down pipe or IC. I just let the car heat up and watched for oil in the compressor and turbine outlets. Now the old good one suddenly started leaking some oil into the turbine housing. The old bad one now is dry as a bone.

Do the little piston rings take a while to seat or anything?
I will also take the turbo off and check out what is happening in there. Seems pretty simple: a ring land on the shaft (shaft/wheels were cleaned and balanced and checked for wear), a little piston ring (new from the rebuild kit) and then a groove on the center section.
The oil outlet is at about a 35 degree angle but it was like that before the rebuild. There is an 8 inch drop between the outlet and oil pan. The oil feed is a 1/4 inch OD brake line and uses the stock restrictor which looks about 1/8 inch. The drain is -10AN. The drain does go horizontal at some points but then again, it did not leak before the rebuild.
Ack!
Erich

Erich

This is the plan for repair after a talking to the rebuilding guy at Turbocity:
15 degrees MAX on the tilt of the IHI turbos-I have 35 degrees.
There is no real oil control seal on the turbine side. The little piston ring on the shaft is to prevent exhaust gas from entering the oil. Where the ring gap is ie up or down is more critical on non OEM installs with tilt. I should have measured ring gap by taking the new piston ring and putting it into my cleaned center housing then making sure the gap is 0.008-0.010 with a total max of 0.014 inches.
This is the plan of what to check.
Erich