300 tdi vacuum pump replacement- bad to worse - Page 2





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  1. #21
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by AR155 View Post
    Yeah, took me quite some time to figure this out

    During my install I tried a few different sources for ignition on signal. I first tried tapping into the glowplug relay, but this caused the glowplugs to stop working... Checked the fuse, nope fuse is fine.

    And so started days of searching for the possible fault. Before I gave up completely, I decided to remove ALL fuses and check EACH one with tester. So wragtig, one of the fuses had like a hairline crack through the little wire. I missed this when eye balling it... Et voila!
    Hi Derik

    why haven't you fitted the Allisport expansion tank yet? Do that asap, when that bottle cracks open, you risk loosing the engine, with or without Madman!!!

    and you need to clean up that engine bay

    This is what looked like when it was still mine
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    Last edited by hgbosch; 2018/01/23 at 09:20 AM.
    George Bosch
    2003 RangeRover Vogue 3.0 Td6 (Mine) / 2005 LR Disco3 TDV6 S (Swambo's) / 1998 Disco1 Tdi ES (Sold) / And some more serious stuff

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  2. #22
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by AR155 View Post
    It is time for an update.

    Wingate in Johannesburg sells a vacuum pump kit for about R4600.

    I fitted the electric pump in December. The kit has everything you need included, and the pump is tested by Wingate before selling it.

    I added one relay as peace of mind.

    The electric pump is noisy for a few seconds until the desired vacuum is reached.

    The best part is the engine is running A LOT quieter than before.



    Happy days!
    what is it like driving any problems so far and can it cope with on off on off repetibly on the brakes, and you not loosing cacuum, once you use brakes how long does it run before cutting off again and how noisy is it once you driving and it starts up can you hear it over the engine

    i just bought another unipump will see how that holds up if not will go the way you did,

    maybe you could try sell that pump to some one as a spare

    clive
    1995 300TDi Defender with VGT Turbo (stolen by my son now )
    2002 Defender with LS1 MS3 ECU, 4L80e, LT230 1.222, Lockers and HD CW&P, 35" with 4" Lift
    2005 Defender TD5

  3. #23
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by hgbosch View Post
    Hi Derik

    why haven't you fitted the Allisport expansion tank yet? Do that asap, when that bottle cracks open, you risk loosing the engine, with or without Madman!!!

    and you need to clean up that engine bay

    This is what looked like when it was still mine

    Genade oom George! Dis 'n fo by fo ekse!

    I have meant to fit it a thousand times... something always comes up. It does ride with me on longer trips though.

  4. #24
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by clivemd View Post
    what is it like driving any problems so far and can it cope with on off on off repetibly on the brakes, and you not loosing cacuum, once you use brakes how long does it run before cutting off again and how noisy is it once you driving and it starts up can you hear it over the engine

    i just bought another unipump will see how that holds up if not will go the way you did,

    maybe you could try sell that pump to some one as a spare

    clive

    I actually only used it for a few short trips to test and then borrowed the car to my dad while his car is in for repairs.

    From my experience the brakes just function as they always did. The electric pump is a beast and favored by offroad junkies according to the seller. It did not switch on every time that I used the brakes... Maybe every 2nd time? Perhaps a function of how long you use the pedal. Leaks will also make it switch on more often.

    I could not hear it while driving. Sitting in the car with doors closed at idle, you can hear it faintly. Standing outside you can not miss it :-)

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  6. #25
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Resurrecting an old thread.

    Just a quick question.

    Look at the following clip and in the first 2&1/2 minutes he explains a function of the vacuum pump.



    Here's the question: the air that the pump pushes into the crank case, is it important?

    Does it have a purpose? Crankcase pressure?

    This is just for when I, one day convert mine to electric.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind²)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  7. #26
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by jfh View Post

    Here's the question: the air that the pump pushes into the crank case, is it important?

    Does it have a purpose? Crankcase pressure?

    This is just for when I, one day convert mine to electric.
    most 4-stroke engines rely on positive crankcase pressure to remove unwanted gases and moisture from the inside of the block

    I would guess this is part of that system.
    2012 Jeep Sahara Unlimited 3.6 V6
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  8. #27
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    So, I plumb the electrical pump exhaust back into the crankcase?
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind²)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  9. #28
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by jfh View Post
    So, I plumb the electrical pump exhaust back into the crankcase?
    why not? install an oil catch can while you're busy
    2012 Jeep Sahara Unlimited 3.6 V6
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  10. #29
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    On the other hand, the electrical pump switches off when it has reached the desired pressure.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind²)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  11. #30
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by AR155 View Post
    It is time for an update.

    Wingate in Johannesburg sells a vacuum pump kit for about R4600.

    I fitted the electric pump in December. The kit has everything you need included, and the pump is tested by Wingate before selling it.

    I added one relay as peace of mind.

    The electric pump is noisy for a few seconds until the desired vacuum is reached.

    The best part is the engine is running A LOT quieter than before.

    Some pics:

    Size wrt A4 page
    Attachment 474619

    Installation notes
    Attachment 474620

    The kit
    Attachment 474621

    Installed
    Attachment 474622


    Happy days!
    Hi AR155

    Did you notice any difference with the change to electric?
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind²)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  12. #31
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by jfh View Post
    So, I plumb the electrical pump exhaust back into the crankcase?
    I wouldn't, it serves no purpose, vac pump is merely removing the small amount of air in the servo unit until the desired vacuum is obtained for satisfactory brake assist
    30 years experience and knowledge certainly out weighs a 5min keyboard bashing on google
    Love's electrickery stuff and problems related to it as long as it dont go bang cos then its f......
    NO REPLACEMENT FOR DISPLACEMENT
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  13. #32
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    But why does the original pump dump it in the crankcase?

    If it's not important, cool but I just wanted to understand the logic behind it.

    It looks like most people who did go electric just blanked off the hole.
    I'm just curious if it might have some sort of effect, negative or positive.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind²)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  14. #33
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    My original vacuum pump on the 300tdi doesnt dump anything into the crankcase or anywhere else

  15. #34
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    I refer to the video in post 25, there he describes it.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind²)
    '84 Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work.
    The only thing needed for evil to triumph is for a good man to do nothing.

  16. #35
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    Default Re: 300 tdi vacuum pump replacement- bad to worse

    Quote Originally Posted by jfh View Post
    I refer to the video in post 25, there he describes it.
    jfh, I've been thinking about this post quite a lot as I work on my 300 Tdi engine.

    Logically speaking, the vacuum pump has got to "dump" the excess air somewhere. Since it doesn't have a vent to atmosphere, it makes sense that it goes into the crankcase.

    However, I think it's a bit optimistic to expect it to greatly affect crankcase pressure. Remember that the pump "sucks" to provide a vacuum for the brake booster only. Once the vacuum is achieved, there should be little to no air flow at all.

    I would imagine that the combined effects of blowby and a bit of "sucking" from the air intake contributes much more to the eventual purging of gases from the crankcase.

    So in my considered and definitely non-expert opinion, there would be no need to make another plan for crankcase pressure when removing the vacuum pump.

    When I rebuild my engine, I'm not going back to mechanical pumps. Both vacuum and lift pumps are going to be electric, with the vacuum pump working on demand. I'll put blanking plates on the holes. I'll carry a spare electric fuel pump.

    (thinking of going for electric cooling fans too, but that's another story).



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