Quote:
Originally Posted by Mxfrank
The turbo produces only 1 bar of pressure at full scream. Nominal oil pressure is 3 bar according to the gauge, but probably peaks at close to 5. So if you were dependent on hydrostatic pressure to oppose leaks, you would have quite a mess. The shafts and seals are designed to float on a film of oil, which is why they may seem to be a loose fit.
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I am aware of that, and know that any oil that gets past the seals and bearings has lost it's pressure. It is a matter of the oil taking the path of least resistance. At idle, the oil will want to go past the seal and bearings (less resistance than the oil drain), but any added pressure (boost) should cause the oil to take the path of least resistance, being the oil drain. That is just how I see it in my case (Mitsubishi), but may not cross over to the turbo on a 617. The 617 may have more oil volume and pressure going to the turbo than the Mits, and that might explain the larger volume of oil getting into the intake at boost. Either way, a turbo rebuild/replace is in order.