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Oil leak at Filler Cap.

posted by  Doc67 on  Sun Feb 6 07:05 CST 2005
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I have a 98V70XC that has developed a nasty oil leak at the top of the engine. Oil appears to be coming out of the filler cap. The gasket on the cap looks fine. It leaks worse at highway speeds. When I open the cap with the engine running, I hear a pssst, like opening a soda bottle. Is it normal to have that much pressure in the crankcase? It is a turbo so I assume that there is no flame trap. Any ideas would be greatly appreciated.








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    Oil leak at Filler Cap.

    posted by  Doc67 on  Sun Feb 6 09:12 CST 2005
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    I Checked the vent hose from the top of the engine and it is clear. So I found the hose to the PTC nipple vavle. I removed the cold air intake to the turbo to get the valve out. The valve was plugged solid. After cleaning it out, it now passes lots of air. Do you know if in the powed off state, this is normal. Does the valve close when powered? How do you test the valve? Should I just buy an new valve to be safe?

    PS, the cold air intake at the turbo coupling had distengrated to the point where it must have been sucking an awful lot of air. I definately have to replace it.







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      PTC nipple valve

      posted by  KlausC on  Sun Feb 6 10:21 CST 2005
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      last visit: Fri Oct 24 10:15 CST 2014
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      Doc,
      A new one for me. what where is the PTC? Is it a vacuum line or a larger hose? If you describe it good, I can put it in my notes for others to check.
      Thanks,
      Klaus
      --
      98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)








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        PTC nipple valve

        posted by  Doc67 on  Sun Feb 6 15:02 CST 2005
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        The PTC Nipple is mounted in the cold air intake pipe that runs from the air filter box to the turbo. It is in the elbow of the pipe, nearest the turbo. It has two vacumm hoses connected that run back to the oil trap. There is also an electrical connector. It looks like your typical piece of electical mumbo jumbo stuff. It is not very large, about the size of a spark plug.

        I am not sure what its' actual function is, but it passes the crank case gases back into the engine to be burned. I have been told that it may be a device to heat the gases when the engine is cold. Regardless, mine was blocked and I had way too much pressure in the crank case, causing oil to blow from the filler cap.

        When I get the new intake pipe and put it back together, I will let you know.
        I can also forward a picture of it if you would like.
        Send an email to me: rafuse_d@hotmail.com







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    Oil leak at Filler Cap.

    posted by  V70BB on  Sun Feb 6 07:24 CST 2005
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    no flame trap per se, but you still have the crankcase ventilation plumbing to keep an eye on. Turbo or non, it can and will get plugged, especially if the oil change interval of 5k miles with dino oil, was followed. 5k is too much for dino oil, regardless of whether volvo recommends that. They recommended it to keep the cost of ownership down. Get the crankcase plumbing checked out and you will probably find the reason for the pressure. Also, if the gasket looks fine, looks can be deceiving. They become inflexible without showing any other signs of degradation (i.e. cracking). Change the gasket with every other oil change.

    BB







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