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Hey guys, still working on the install for the turbo I picked up, more details in this thread.
Anywhoo, I have the crossover pipe installed, no issues with the ZF, will need to bend the body flange over still to get the down and up pipe installed. Before I did that, I got to thinking I should inspect my turbo more before I go through the hassle of a complete install only to get a runaway. Double verified minimal lateral movement with no contact to sides, and zero longitudinal movement. But what about the oil seal? How to test it? I had left my mighty vac at work that does vacuum and pressure, so I did the next best thing. Plugged the oil supply by hand, and puckered up to the drain and blew. I can hear air escaping from the compressor side. Does this mean I need to do a rebuild? Or is it because I didn't put any oil in the turbo oil lines yet its doing that?
If I do need to do a rebuild, what kit should I get? I don't intend to change the compressor wheel, just need a basic seal kit. Is the t04b turbo able to use a T3/T4 turbo seal?
Well, after a lot of research I found out how to properly test a turbo oil seals. Posting it in case anyone else needs it. Hope others find it helpful.
"Pressurizing the oiling galleries is the easy part but they will leak unless you can simulate the pressure differential in the turbine and compressor housings which is what keeps you oil 'sealed' it's essentially half an air seal and half piston ring style seal. That's why turbos that don't pressurize every so often like just idling can start to smoke as the oil gets past the seal. Most turbos will smoke at idle if they're bad, and at idle you should have little exhaust pressure if any.
Also, the pressure on the oil side will have to be higher than the exhaust side - that's how the oil gets out. If exhaust pressure was higher, the exhaust would push into the oiling system."
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