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White foam in PVC 850

posted by  someone claiming to be dwight on  Tue May 4 17:25 CST 2010 [RELATED]

I have a 1997 850 NA with 140K. It uses about a cup of coolant every 200 miles. It runs perfectly, no white exhaust. I replaced the PVC system a few days ago. The tubes were stuffed with white foam, the PVC canister had a half cup of water in it, and the vacum line that runs with the PVC tube from the canister to the throttle body was melted aganist the engine block. I have only owned the car for the last 10K so I don't know if it was over heated in it's previous life. Is there anyway to know if this is a head gasket vs a cracked head/block. Also the engine oil is in perfect condition but I do get some white foam on the dipstick. Thanks








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    White foam in PVC 850

    posted by  KlausC on  Wed May 5 04:41 CST 2010
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    If the front of the block got hot enough to melt and weld the line, it has indeed overheated. Antifreeze in the PCV is an indicator of headgasket leak, which must be fixed before additional damage is done.

    These blocks seldom crack, the rings are robust, and the heads are a royal pain to remove and install. Even if you DIY, the head will need to be checked by a machine shop, cleaned, new valve stem seals installed and that doesn't come cheap.

    Klaus
    --
    Cynthia Amendt, RIP








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      White foam in PVC 850

      posted by  someone claiming to be dwight on  Wed May 5 15:22 CST 2010 [RELATED]

      Thanks Klaus, I've done a head gasket on another 850 and you're right it is alot of work. I think I'll park it until I get up the steam to tackle it. It's a great car otherwise. I got it at an autoauction for $900. Thanks again, Dwight







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