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Series 3 Diesel vacuum pump question

Discussion in 'Series Land Rovers' started by Jules59, Sep 18, 2019.

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  1. Jules59

    Jules59 Member

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    I have a question about the vacuum pump on my diesel S3 project re-build. The pump has two inlet ports (I think they both suck). One goes to the brake servo (pipe attached). What is the other port for ? Should it be capped off or left open ?

    S3 (49) (Large).jpg
     
  2. tottot

    tottot Well-Known Member

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    I have not ever seen one of these in the flesh, most series that had a servo had a flap device in the inlet manifold to provide the vacuum [ pretty rubbish ]. For yours to work both inlet and outlet need to be open.
    To test pump remove pipe and with engine running [ careful as rotating parts near ] and put a finger over each pipe in turn. One should suck and one should blow. Pipe needs to be on the one sucking the other should be left open.
     
  3. rob1miles

    rob1miles Well-Known Member

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    Where does it exhaust? If there is no exhaust then that could be it.. If it is the exhaust put a bit of pipe on it and route it somewhere where dirt and water wont block it.
     
  4. Chopz

    Chopz Member

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    One sucks for the servo and the other is the exhaust
    That same vacuum pump used to be fitted to fords with the old Peugeot engine
     
  5. steve2286w

    steve2286w Well-Known Member

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    the standard set up uses the inlet manifold for vacuum as tottot says this then Tees off and one goes to servo and th either to a vacuum reservoir storage tank , to make it work well the butterfly valve needs to be adjusted properly using the adjustable levers
     
  6. divie

    divie Well-Known Member

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    I have not seen a vacuum pump like that before. My series three ha the butterfly arrangement on the inlet manifold, as stated before a bit of a rubbish set up.
    Add on to the poor set up of butterfly arrangement 30+ years of wear and you will never get it working well.
    My solution was to bin the butterfly and blank off then fit an electric vacuum pump triggered from the brake light switch. Two hours work and sub £100 all in.
     
  7. Jules59

    Jules59 Member

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    Certainly no butterfly valve on this diesel's inlet manifold that I can see.
     
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