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Thread: blank off 300tdi vacuum pump

  1. #21
    Join Date
    Aug 2009
    Location
    Engadine - In the Shire, 1 hr South of Sydney
    Posts
    2,019
    Thanks gents - bit the bullet and bought a new pump but not a Wabco one - supplier (Karcraft) won't use them anymore and they said the one they sold me is a much better unit (time will tell). Will install with the 2 gaskets to save the piston. I can't move the piston on the new pump but can do so on the old Wabco one but that's the one that barely provided any suction. I searched for a oil injector inside the pump housing area but couldn't see one. Will let you know the outcome later today - hopefully.
    cheers Gerald
    "My greatest problem lies in reconciling my net income with my gross habits" - Errol Flynn

    Rare white 96 110 Deafener - "Boofy"
    Customised dents, scratches and leaks
    Locker in the rear - for my spivvy clothes

  2. #22
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    14,617
    Quote Originally Posted by Didge View Post
    Thanks gents - bit the bullet and bought a new pump but not a Wabco one - supplier (Karcraft) won't use them anymore and they said the one they sold me is a much better unit (time will tell). Will install with the 2 gaskets to save the piston. I can't move the piston on the new pump but can do so on the old Wabco one but that's the one that barely provided any suction. I searched for a oil injector inside the pump housing area but couldn't see one. Will let you know the outcome later today - hopefully.
    cheers Gerald
    I bought a Bearmach from Karcraft probably 6 or 7 years ago as I refused to buy a Wabco and AFAIK it's still on the car.

  3. #23
    Join Date
    Aug 2009
    Location
    Engadine - In the Shire, 1 hr South of Sydney
    Posts
    2,019
    Hi Rick & all, update is rather disappointing as the new pump does suck harder but no where near what I expected and the pedal only drops a little bit due, I hope, to vacuum. Next thing to check is the vacuum hose but I'm very certain that is leak free. Failing that and possibly seized calipers (which i haven't checked), I'm stumped.
    "My greatest problem lies in reconciling my net income with my gross habits" - Errol Flynn

    Rare white 96 110 Deafener - "Boofy"
    Customised dents, scratches and leaks
    Locker in the rear - for my spivvy clothes

  4. #24
    Join Date
    Jan 1970
    Location
    NSW far north coast
    Posts
    14,617
    Are you absolutely, positively sure the booster is ok?
    You can tell me too bugger off, I can take it, but they are a problem with fatigue cracking.
    Quote Originally Posted by Didge View Post
    Hi Rick & all, update is rather disappointing as the new pump does suck harder but no where near what I expected and the pedal only drops a little bit due, I hope, to vacuum. Next thing to check is the vacuum hose but I'm very certain that is leak free. Failing that and possibly seized calipers (which i haven't checked), I'm stumped.

  5. #25
    Join Date
    Aug 2009
    Location
    Engadine - In the Shire, 1 hr South of Sydney
    Posts
    2,019
    Quote Originally Posted by rick130 View Post
    Are you absolutely, positively sure the booster is ok?
    You can tell me too bugger off, I can take it, but they are a problem with fatigue cracking.
    Hi Rick, well it was only 60,000km ago that I replaced both the vacuum pump and servo (booster). I attached it to a vacuum cleaner (which quite surprisingly fit very well over the rubber grommet for the one way valve), and it certainly made depressing the plunger a hell of a lot easier.

    Given that the average vacuum cleaner supposedly provides 20kpa of vacuum and the vacuum pump is supposed to dish out approx 75kpa = (10-12psi/-.8ATM/20-25inHg - from blknight's post) of vacuum (which I highly doubt) I figured a conservative way to test the servo would be to use the vacuum cleaner as it is around 1/4 of the strength the pump is supposed to provide.
    This morning I did the test where you pull the hose off the servo and listen to the hiss as air rushes in but it was still disappointing - not too much hiss at all. I'll double check the hose itself and have another look at the servo but I'm pretty sure that is in good nick. I haven't really done much off roading since I replaced them (which is disappointing). I'll also double check the seal between the master cylinder and servo.
    "My greatest problem lies in reconciling my net income with my gross habits" - Errol Flynn

    Rare white 96 110 Deafener - "Boofy"
    Customised dents, scratches and leaks
    Locker in the rear - for my spivvy clothes

  6. #26
    Join Date
    Sep 2013
    Location
    Darwin
    Posts
    1,426
    Quote Originally Posted by Didge View Post
    ...listen to the hiss...
    With the vacuum pump connected to the servo and engine running stick your head in the drivers footwell to determine if there is a hiss coming from the servo on the other side of the firewall - hiss is air leaking into vacuum.

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