Brake vacuum pump question

Discussion in 'Introduce Yourself' started by HotBlue, Jul 22, 2016.

  1. HotBlue

    HotBlue Funster

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    Hi, I am new to the group. I have a major problem which I hope someone may have a solution for. I own a 1992 Fiat Ducato motorhome. The braking system is very weak due to the vacuum pump not operating. It attaches to the side of the engine and connects directly to the camshaft. It appears that there should be a keyway that fits between the pump and the camshaft to make the pump rotate. This is missing! All the dealers I've checked do not have one. Does anyone have any ideas on this - or even better and actual keyway for sale?
    All the best,
    HotBlue.
     
  2. jonandshell

    jonandshell Funster

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    It's probably a standard key available from many engineering suppliers.

    I have selection boxes of standard and woodruff keys in the back of my work van.
     
  3. jonandshell

    jonandshell Funster

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    Have you a photo of the driven shaft?
     
  4. tonyidle

    tonyidle Funster

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  5. HotBlue

    HotBlue Funster

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    I have a photo of the pump on my engine and a stock photo of the actual pump (a bit awkward to take it off again to photograph!). I hope this helps. BrakePumpOnMyEngine.jpg Brake Vacuum Pump.PNG
     
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  6. jonandshell

    jonandshell Funster

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    I see, its a coupling rather than a key in the engineering sense.
    It might be main dealer or engine specialist only.
     
  7. John Laidler

    John Laidler Funster

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    That coupling wouldn't get lost on its own. I suspect it has been removed because the pump might be seized or otherwise broken. Can you check if it will rotate?
     
  8. mitzimad

    mitzimad Funster

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    are you sure its located properly looking at the picture the flange doesnt seem to be sitting right tho it may be the camera anglewhat ever it locates onto must have an oil feed looking at the o ring on the shaft
     
  9. pappajohn

    pappajohn Funster Life Member

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    Last edited: Jul 22, 2016
  10. HotBlue

    HotBlue Funster

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    It rotates freely and, as a test, I put it into a drill to spin it - it produced a good vacuum!
     
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  11. HotBlue

    HotBlue Funster

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  12. HotBlue

    HotBlue Funster

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    The flange sits flush on the engine block and oil doesn't leek out when the engine is running. Sorry about the camera angle.
     
  13. HotBlue

    HotBlue Funster

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    Tried dealers and the stock response I get is that Fiat have a 10 year turn around for parts - i.e. not available any more.
     
  14. Ranger

    Ranger Funster

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    Try your local Iveco truck repair centre and take the pump and a photo of the missing part as in your photo No:2 with you or failing that any van repair centre.
     
  15. jonandshell

    jonandshell Funster

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    I wonder if @Willdbill has such a part left over after his engine rebuilding exploits?
     
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  16. jockaneezer

    jockaneezer Funster

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    I take it your pump looks exactly like the one in the photo, complete with the tee shaped spigot sticking out the top or is that the bit you need ? If it is exactly the same, then the drive coupling will be a small disc with a hole through the centre and a square cut out groove on one side and square driving lugs on the other, set at 90° to each other. More than likely, someone has removed the pump in the past and the coupling has fallen out and been lost. I think your best bet would be a breakers yard, they will be pretty standard on most any diesel Fiat of that age, not necessarily just on van engines.
    Edit.
    Just found a picture of the type of thing you need.
    https://www.google.co.uk/search?q=fiat+vacuum+pump+coupling&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiO2cjKyIfOAhWDLMAKHaJdA_gQ_AUICCgC&biw=1280&bih=800#imgrc=lQPT_nNjBqkyNM:
     
    Last edited: Jul 22, 2016
  17. Wildbill

    Wildbill Funster

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    Will have a look when I get in from work can't remember swing one but their boxies of spare parts in my garage .
    Bill
     
  18. Wildbill

    Wildbill Funster

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    That pump is not engaged eight take it off and mount it correctly before it brakes sum thing important
    Bill
     
  19. Wildbill

    Wildbill Funster

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    I think you should inspect the hose if it producing a good vacuum. It losing vacuums sume whare
    Change the hose
    Bill
     
  20. HotBlue

    HotBlue Funster

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    My mechanic put the pump back as we found it and the engine has been running fine. We appear to be missing the part that couples from the cam-shaft to the pump. The link that jockaneezer sent me, it seems clear that we need this coupler for the pump to operate correctly.
     
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