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hoppy
Join Date: Jul 2009
Location: PA
Posts: 4
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Oil back pressure at oil tank vent
Hi I have a 911 SC 1979 and have a problem with oil backing up into vent hose from oil tank to air plenum. I have checked oil level with engine running it is at normal level. I am not familiar with the oil circulation route and it seems that hoses are connected correctly. This car is just been restored after sitting for 13 years look great , now I need to get some other bugs fixed. I also checked the PCV tube and it is clean no restrictions vent is open and clear. I appreciate any and all suggestions.
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09-25-2009, 01:19 PM
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Do you have the restricter in the hose between the tank and the air plenum?
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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09-25-2009, 01:30 PM
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hoppy
Join Date: Jul 2009
Location: PA
Posts: 4
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no there is none in parts listing etc. checking to see where it could be none showing for 1979 SC.
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09-29-2009, 09:40 AM
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Registered
Join Date: Feb 2007
Location: Northeast
Posts: 464
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Pressure in the tank implies pressure in the crankcase. Meaning blowby.
A tight engine will actualy have vacuum in the case. And a PCV valve? Never had em since all venting is done through the two hoses. |
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10-03-2009, 05:33 AM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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I would be doing a leakdown test to check the condition of the rings. This can account for the crankcase getting pressurized and pushing oil into the airbox.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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10-03-2009, 08:12 AM
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1979 Porsche 911SC
