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Old 12-09-2012, 07:08 PM   #1
1990 Turbo Oil Return Hose HELP PLEASE  
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Hey yall newbie here. Im asking this question for my step dad. He has a 1990 2.5 turbo Daytona. He has recently rebuilt engine and replaced turbo (stock specs). On the turbo oil return hose there is a T fitting going to air box. Well you guessed it its filling air box with oil. He actually tore engine back out and apart to find everything checked fine. Brought turbo back to local shop that are turbo gurus. New turbo is fine. What would cause so much oil to be venting back into air box??? His idea is to drill and tap valve cover and run hose to valve cover?? I told him to wait and maybe get some help here. I had mentioned everything I have read here as far as restrictions, also those cars having a slight "mist" well this is actually "pumping" oil into intake.

Last edited by greeze75; 12-09-2012 at 07:11 PM.. Reason: Forgot to add information.
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Old 12-09-2012, 07:23 PM   #2
Re: 1990 Turbo Oil Return Hose HELP PLEASE  
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more than likely the oil is coming from the valve cover out of the PCV system. The T in the oil return is so that oil can drain back into the crank.
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Old 12-09-2012, 11:11 PM   #3
Re: 1990 Turbo Oil Return Hose HELP PLEASE  
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Agreed, the T is there to let whatever oil accumulates in the airbox from the V.C (which it usually does) to drain back to the pan. They used to just have a hole in the bottom of the airbox and let it drip out, but I think new EPA regulations prohibited that.

Maybe he pulled the baffle out of the valve cover and didn't seal it properly when he installed it, letting excess oil get out the PCV system....?
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Old 12-10-2012, 09:23 AM   #4
Re: 1990 Turbo Oil Return Hose HELP PLEASE  
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Quote:
Originally Posted by ChargedDust View Post
Agreed, the T is there to let whatever oil accumulates in the airbox from the V.C (which it usually does) to drain back to the pan. They used to just have a hole in the bottom of the airbox and let it drip out, but I think new EPA regulations prohibited that.

Maybe he pulled the baffle out of the valve cover and didn't seal it properly when he installed it, letting excess oil get out the PCV system....?
Thats an idea. . . maybe you should check that out
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Old 12-10-2012, 10:04 AM   #5
Re: 1990 Turbo Oil Return Hose HELP PLEASE  
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make sure the check valve in the line that goes to the return pipe t is not backwards...unlikely because i think that hose is formed..but might as well check
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Old 12-10-2012, 12:41 PM   #6
Re: 1990 Turbo Oil Return Hose HELP PLEASE  
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Thx again guys. I will have him check. I was looking at it a couple weeks ago and the T is in the oil return line from turbo. The hose coming off the T goes to the air box filling it with oil. He was going to route it to the valve cover to keep oil inside the engine. There was/is no provision in the valve cover he was/is going to add one (hillbilly engineering LOL). I could understand a slight amount of oil coming off that hose but I dont think it should be quarts of oil filling air box. I mean the air filter was literally soaked and dripping after a ride around the block. I told him to crack the oil fill cap as to make sure the crank case is vented and to check it again. When rebuilding the engine he removed that internal balancer in the crank case area and had crank balanced could that have anything to do with it
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Old 12-10-2012, 12:45 PM   #7
Re: 1990 Turbo Oil Return Hose HELP PLEASE  
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So I reread the responses. That hose is supposed to be a drain??? It seems that it is working opposite of the intended use. Instead of oil draining down that tube oil is coming up the hose into air box. Thx again guys. This is kicking his BUTT.
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