Posted by Bob on March 21, 2014 at 22:46:31 from (64.255.159.192):
In Reply to: Turbos again! posted by showcrop on March 21, 2014 at 15:06:37:
Show, thanks for your kind words. I would say NO amount of oil is acceptable coming out the intake (compressor) side of the turbo (except as qualified below). And, like the other guy, I"ll say to check the oil return line for restriction/coking FIRST.
FWIW, a year or two back I got into a similar thread here about capping the exhaust stack while hauling a turbo tractor, and, just like this time, it wasn't purdy!
I agree to the point that for the turbo to spin, the engine would have to have stopped at a point of valve overlap that would allow enough air to flow through the head to allow the turbo to "spin up" unrestricted.
I"m NOT sure that will ever happen. But, growing up in the 60"s into the 70"s, when turbos were still "new tech" a good family friend that transported tractors was always sure to cap the exhaust, just to be sure.
When my favorite little lawn ornament was delivered back in 1978, they taped off the exhaust for transport.
So, for all the $$$$$ that are involved if hauling takes the turbo out, I still err on the side of caution!
Returning to the question of oil on the compressor side of the turbo, COUNTLESS turbos on Chevy 6.5 diesel trucks were replaced 'cuz oil shows up on the outlet side of the compressor.
Well, in that situation, the crankcase was vented through a poorly-designed oil separator to the INTAKE side of the turbo.,
The oil at the OUTPUT side of the turbo was simply the condensed /coalesced version of what was vented INTO the turbo for emissions reasons.
And, (apparently) is was easier for corporate to replace the turbos than to admit to customers the actual source of the oil???
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