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Thread: 300tdi vac pump- this is it's insides.

  1. 6th November 2006, 06:54 PM #11
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    amshaw
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    Well I must be a dumb ****.....I didnt even know it was there ! I have no idea whats its for either.

    Had a look and its been leaking for a looong time....I just thought the soft brakes was just "The way it is".....

    Anything really hard re taking the pump off....?
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  2. 6th November 2006, 08:35 PM #12
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    Quote Originally Posted by spudboy
    Can I display my ignorance and ask what a vacuum pump does exactly?

    it sucks.....


    basically......
    diesel engines dont have the same amount of vacuum in the inlet manifold as petrol engines....
    therefore they require a bit of help to create enough vacuum to operate things such as the brake booster......
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  3. 9th November 2006, 08:21 AM #13
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    When something breaks inside it this is what it looks like

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  4. 2nd March 2007, 11:28 AM #14
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    Mine has just gone bung. Oil leaking everywhere from it.

    Am going to try Ace's fix. For $10 it doesn't compare to the $600 for a new one. Here's hoping, 'cause I don't feel like buying a new one at all.
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  5. 2nd March 2007, 11:49 AM #15
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    Slightly OT.

    Was it someone on here that repaired a Cruise Control Vac. Pump?
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  6. 2nd March 2007, 12:36 PM #16
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    Quote Originally Posted by spudboy View Post
    Can I display my ignorance and ask what a vacuum pump does exactly? Something to do with the brakes?
    Creates a vacuum... .

    Many cars use vacuum for a variety of reasons, ie brake booster and vacuum operated HVAC controls. Diesel engines don't produce vacuum, so a vacuum pump is substituted.

    It is not really a vacuum, merely lower than atmospheric pressure.
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  7. 2nd March 2007, 01:47 PM #17
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    Quote Originally Posted by BigJon View Post
    Creates a vacuum... .

    Many cars use vacuum for a variety of reasons, ie brake booster and vacuum operated HVAC controls. Diesel engines don't produce vacuum, so a vacuum pump is substituted.

    It is not really a vacuum, merely lower than atmospheric pressure.
    Will a barometer read if it's working
    Cheers Baz.

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  8. 2nd March 2007, 03:06 PM #18
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    I don't think the graduations on a barometer will be any good. I guess you could make a clear fronted airtight container that the barometer will fit, then run a pipe from the vacuum pump to your sealed container. Fire up the engine and watch the barometer needle move. Realistically a vacuum guage is what you really need.
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  9. 2nd March 2007, 06:05 PM #19
    waynep
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    Quote Originally Posted by spudboy View Post
    Can I display my ignorance and ask what a vacuum pump does exactly? Something to do with the brakes?
    The way I understand it a diesel doesn't produce enough vacuum from the manifold to drive power brakes etc so they use a special pump...

    boy by the time I typed this two others had replied ...these guys are quick ....!!
    Last edited by waynep; 2nd March 2007 at 06:09 PM.
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  10. 2nd March 2007, 07:15 PM #20
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    Quote Originally Posted by waynep View Post
    The way I understand it a diesel doesn't produce enough vacuum from the manifold to drive power brakes etc so they use a special pump...

    boy by the time I typed this two others had replied ...these guys are quick ....!!

    Actually a diesel engine potentially can produce far more vacuum than any petrol engine. It's directly inversely proportional to the compression ratio.

    The difference is that most modern diesel engines limit their rpm by fuel regulation rather than air intake via a butterfly valve (as petrol motors do).

    A modern diesel engine should never produce any discernable vaccum in the inlet manifold - if it does then you have a blocked inlet air filter and very poor combustion efficiency ie the opposite effect of what your turbo is attempting to achieve.

    And a vacuum pump indeed produces vacuum hence the name. Vacuum is the reduction of air pressure below normal atmospheric air pressure regardless of the amount of such reduction. It is simply measured with a vacuum gauge with inches of Hg (mercury) being the old imperial unit of such measurement.
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