Crank case pressures 850?

Discussion in 'Volvo 850' started by Mystical, Jul 22, 2005.

  1. Mystical

    Mystical Guest

    Thanks for all you suggestions about that oil weight and type to use for
    the next lub. My 1995 non-turbo 850 may also

    need everything serviced or replaced that could contribute to any pressure
    build up in the crankcase. I know about the EGR

    valve (service or replace?) and the flame trap (service or remove?). What
    other items should be considered at the same time?
    Mystical, Jul 22, 2005
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  2. Mystical

    Mike F Guest

    Frequently, crankcase pressure problems are caused by the oil trap being
    plugged. This is a plastic box located under the intake manifold,
    toward the front (belt end) of the engine. Because of it's design, it's
    impossible to clean, so a new one is the only cure. It's an involved
    but not difficult job, the intake manifold has to be removed, I'd also
    replace associated hoses, and make sure you have some hose clamps handy,
    the originals are those annoying single use ones. Also have the oring
    handy for the lower end of the dipstick tube, it's bolted to the
    underside of the intake manifold.

    P.S. Your EGR will not contribute in any way to crankcase pressure.

    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
    Mike F, Jul 22, 2005
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