Smoking S16
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Thread: Smoking S16

  1. #1
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    Default Smoking S16

    Hi,

    I'm starting to notice a little exhaust smoke (light grey coloured) blowing from the 306 S16 under high rpm (6000+) and wondering if this usually points to valve seals?

    The car has run about 220,000km.

    If it does turn out to be the valve stem seals, can they be replaced without the head needing to be removed?


    Cheers.

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  2. #2
    Demannu-facturing! Demannu's Avatar
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    Smoke under power or at high revs will be dead rings/bore. Increased crankcase pressure from blowby causes more oil vapour into the intake and more oil to leak back past the rings to the combustion chamber.

    Blocked or leaking crankcase ventilation pipes can exacerbate the problem.

    Mileage sounds about right to start seeing these symptoms on a generally fairly hard worked engine like the S16 motor.
    Scotty

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  3. #3
    Fellow Frogger! Davo81's Avatar
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    ohhhh, don't say that! Mine's done over 230,000 now!

  4. #4
    Fellow Frogger!
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    A compression test will confirm the problem.

    If the reading is low, drop a teaspoon full of oil in the cylinder and re test, if the reading improves, rings are the problem.

  5. #5
    1000+ Posts gezza's Avatar
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    Is there loadsof smoke coming out the oil filer cap when its running?

  6. #6
    Fellow Frogger! Davo81's Avatar
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    I haven't actually done a compression test, but it seems to have next to no blow-by, so I'm hoping it's fine...

  7. #7
    1000+ Posts Wildebeest's Avatar
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    Default Smoke ?

    Quote Originally Posted by blink View Post
    A compression test will confirm the problem.

    If the reading is low, drop a teaspoon full of oil in the cylinder and re test, if the reading improves, rings are the problem.

    blink,
    I beg to differ with your test method.
    The oil of course will improve the compression reading. Your suggested method is more suitable in checking for a burnt valve.

    The ideal test method is a cylinder leak-down test, a bit of special kit needed for this.

    I'd suggest Katana does an oil consumption test as well as checking crankcase ventilation.
    [Type of oil being used?]

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