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Thread: 300 Tdi valve sealing (or not)?

  1. 20th March 2011, 08:49 PM #1
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    markyc
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    300 Tdi valve sealing (or not)?

    Ladies and Gents,
    Engine running, oil filler cap off, hand over filler hole and I can feel pressure building up. Is this normal? I'd guess not and go one further and guess that the valve stem seals are not doing their job. But I could be wrong; it's been known to happen before!

    Ta,

    Marky
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  2. 21st March 2011, 06:47 AM #2
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    bee utey
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    Valve stem seals aren't fitted to keep pressure in. They keep oil from pouring down the valves. I would look for clogged breathers first.
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  3. 21st March 2011, 06:54 AM #3
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    RR P38
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    More likely it is blow by. Some is normal.
    This is just air escaping past the piston rings as the little explosion happens on the other side of them.
    Yes i agree you could well have some blocked breathers.
    Clear them as soon as you can and you might notice that the engine doesnt loose so much oil on the ground.
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  4. 21st March 2011, 07:30 AM #4
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    I think the brake vac pump blows into the crankcase? try checking the breather cyclone and hoses.
    Terry
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