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Old 09-24-2006, 06:19 PM
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Oil pressure problems

Does anyone know how the oil pressure is controlled in the motor?
i would assume that as the motor rpm goes up then the oil pump shaft spins faster thus increasing the oil pressure just like any other engine. The problem is My Turbo blows oil out the exhast side only at low rpms (under 1500). i have had the turbo rebuilt 2x in the past week so i know that is not the problem. Is there an oil pressure relief or something that controls the pressure or does anyone know what would cause this? THanks
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Old 09-24-2006, 06:25 PM
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Is it coming from the turbo itself? Does it go into the exhaust or does it go all over the motor? Look at the turbo pedistal with the motor running to make sure the orings aren't leaking and that the EBV actuator isn't leaking.
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Old 09-24-2006, 06:27 PM
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Oil pressure works the same as any other. Sounds like you may have some type of restriction in the pedistal for the turbo drain. Does your oil pressure gauge read high?
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Old 09-24-2006, 06:35 PM
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The oil is comming from directly inside of the turbo. The turbo pedistal is brand new. i took it off and checked all my orings and they were fine. i also ran water throught the pedistal when it was off to make sure there was free flow. My turbo shop said the same thing that there is probably a restriction in the drain down. The only restriction that i can figure would be inside the block itself becuase both the pedistal and turbo are brand new. One more question - does the high pressure oil system serve the turbo also or does that just serve the injector rails?
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Old 09-24-2006, 06:36 PM
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oh yeah and the oil pressure gauge reads the same all the time once its running just like any other stock gauge does. You turn it on and it goes right to the standard operating position. Sometimes i think those stock gauges are worthless.
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Old 09-24-2006, 06:43 PM
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The center section of the turbo is cracked. It's not comon but it does happen. I would take it off and look at it close, it may have to come apart to see.
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Old 09-24-2006, 06:53 PM
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that does not make sense to me. i had the turbo rebuilt 2x and both times he put on a new center section and put new shaft seals and bearings. it blew out oil both times. Any idea on how i can go about checking the drain down? Can i take off the oil pan to look up into the block or does the whole motor need to be torn apart?
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Old 09-24-2006, 07:12 PM
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The cast center housing of the turbo?
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Old 09-24-2006, 07:22 PM
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yup the part the mounts directly to the pedistal. he replaced that 2x and also the exhaust housing the first time.
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Old 09-24-2006, 07:26 PM
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The motor has to come out to drop the oil pan.
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