Year 1999 E39 525TDS

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  1. Year 1999 E39 525TDS 
    #1
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    Jul-MRU's Car Details
    Model of Car:
    525 TDS E39
    Year of Manufacture:
    1999
    Transmission Type:
    Manual
    Car Body Type:
    Saloon

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    Oct 2012
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    Mauritius
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    Hello from sunny Mauritius

    I've just purchased a 525tds E39 some weeks ago and after some researches, decided to ask you guys for some help. After 3days of ownership, i noticed that when starting the car and move away, a puddle of diesel on the ground, after some inspections, it avers that it is leaking diesel from the injection pump, the top part. The leak from cold start is quiet important but then tends to diminish when the engine warms up but well its still leaking, resulting in poor fuel economy. Do you think that the seals can be replaced without much hassle? or need to change the pump itself, which cost a fortune here, even used one. Also the car start fine from cold, but when the engine is hot, it takes a while longer to start, once about nearly 40secs of cranking.. :(
    Being a previous Peugeot owner, i have done lots of DIY on the 406 petrol and also the 406 HDI engines, being a newbie with BMW, i would rather ask for advice first and then try any DIY on the car, surrounding garage have no idea bout the engine but will be ready to rip the money (thinking oh, a bmw owner so lots of cash)

    Apart this leak, i've always fancied the 525 and finally managed to get one and what a car to drive even sometimes a bit slow until the turbo kicks in, and after all those years, it still give that feeling of imperiousness. i really like it and dont regret the purchase even with the diesel leak.

    Sorry for the lengthy post, looking forward to your precious advice, many thanks

    Cheers
    Julio
     
     

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    #2
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    Spirit's Car Details
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    e36 323i se saloon
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    #3
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    E36 TDS's Car Details
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    325 TDS
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    1997
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    Hi,

    I think that your car uses the same M51 lump as my older E36, so that means it shares the faults / known issues (unfortunately).
    The injection pump seals can be replaced easily enough, though the difficulty comes in making sure that the top section of the pump is refitted in the right place.
    The tolerance is such that it's really a specialist job, unless you find a good way of marking the pump body so that you can re-fit it in EXACTLY the same place (we are talking mm perfect).

    The hot start issue that you are experiencing is another 'known issue' and there are kits available on Ebay to fix this.
    Something you could try yourself though (if there is not one already fitted to the car) is to fit a non return valve in the fuel line between the fuel filter and the pump.

    Hope that helps a little.
     
     

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    #4
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    Jul-MRU's Car Details
    Model of Car:
    525 TDS E39
    Year of Manufacture:
    1999
    Transmission Type:
    Manual
    Car Body Type:
    Saloon

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    Oct 2012
    Location
    Mauritius
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    Hello Spirit,

    Many thanks for the link, am having a look at it right now and hopefully will get around fixing this annoying issue.

    Cheers
    Julio
     
     

  7.  
    #5
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    Jul-MRU's Car Details
    Model of Car:
    525 TDS E39
    Year of Manufacture:
    1999
    Transmission Type:
    Manual
    Car Body Type:
    Saloon

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    Oct 2012
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    Mauritius
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    Hello E36 TDS,

    Many thanks,
    Effectively its the (old) M51 engine And phew, everywhere i was asking here in Mauritius, they says that no repair kit for the pump, put in another one. Well used ones here are way difficult to come across and those selling it are asking for something 400 GBP without any warranty. Can the seals, (especially the top part be changed without removing the pump) a bit at a lost on how to block the engine. Am pretty handy at DIY, i might eventually try marking the pump body, first thought need to get my hands on those seals (ebay?)
    2nd part
    Okie, i've read about the non return valve, but had no idea where it was supposed to be, and sometimes, i had noticed some air bubbles going from the fuel filter to the pump and after 10mins of idling the bubbles disappear. I will investigate on ebay for the NRV and hopefully fix this issue (annoying specially when in a car park and everyone looking at you cranking like mad)

    Thanks again,

    Julio
     
     

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    E36 TDS's Car Details
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    The top seal can definitely be changed without removal of the pump, so that's good news.
    I believe (and this is not from personal experience, just what I have read) that the non-return valve is supposed to be fitted in the clear fuel line between the fuel filter head and the actual pump itself. The theory being that it helps the fuel stay in the pump ready for the next start.
     
     

  9. The Following User Says Thank You to E36 TDS For This Useful Post:

    Jul-MRU (30-11-2012)

  10.  
    #7
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    Jul-MRU's Car Details
    Model of Car:
    525 TDS E39
    Year of Manufacture:
    1999
    Transmission Type:
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    Car Body Type:
    Saloon

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    Hi E36 TDS.

    Thanks for those useful information. Have had a look yesterday after the office, i agree of the approx location of the non return valve to be fitted. and my cousin also confirm that taking long to to start as need to purge the air before the car start. However big big issue... i have called several places on the island and NO ONE ever heard of placing a non return valve, dont even know what am talking about . so my question to you will be could you please send me a pic of the non return valve and if i can order online? also yes you are right about the top part of the pump, i have read some manual on how to change the seal, first i will wash everything and confirm all seals that have gone wrong. (again i will have to order those seals on line) not available here except two specialized shops and they are asking for 37 pounds.....
    you think fixing those issues with car slow to starts when on 1/4 tank?

    Many thanks.
    Cheers
    Julio
     
     

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    E36 TDS's Car Details
    Model of Car:
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    Quote Originally Posted by Jul-MRU View Post


    you think fixing those issues with car slow to starts when on 1/4 tank?

    Many thanks.
    Cheers
    Julio
    Ah... well that sounds different to the problem you first mentioned.
    If your car is struggling to start when low on fuel then the most likely cause of this will be the 'lift pump' which is situated under the back seat inside the actual fuel tank.
    The pump itself might be knackered - can you hear it kick in when you switch the ignition on ?
    It might even be the 'o' ring which is supposed to seal where the pump sits in the tank and if this is not sealing properly then you'll be getting air drawn into the system.


    I don't have any pictures of non-return valves, but I'll have a look around and see if i can find something (I don't have one fitted to my car......yet)
     
     

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    Jul-MRU (01-12-2012)

  13.  
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    Just did a quick search on Ebay, and something like this (not looked into sizes) would probably do the trick;


    8mm Fuel Non Return Check Valve one way petrol diesel | eBay

    Here's the whole search I did;

    diesel non return valve | eBay
     
     

  14.  
    #10
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    Jul-MRU's Car Details
    Model of Car:
    525 TDS E39
    Year of Manufacture:
    1999
    Transmission Type:
    Manual
    Car Body Type:
    Saloon

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    Mauritius
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    Hi from sunny Mauritius

    Humm..like an idiot i didnt even though to investigate the lift pump. Too concerned with the IP. Yet had have this problem with HDI engine, seals knackered and engine sucking on air. I will remove the back seats and have a look and listen. with the seats on i cant hear anything Also i have noticed that the pipe coming from the fuel filter to the IP leaks just at the place where it enter the pump. (managed to see it after a good clean up of all the goo that was present). now i have to ascertain that its the only point leaking or somewhere else as the flow of the leak soak the pump pretty quickly and make it difficult to see if other places leaking.

    Below is a pic of pump taken from internet, the red markup was already on the picture.

    In green Nº1 where the pipe connect to the pump and where i noticed it leaking
    In green Nº2 not sure if it is leaking or the diesel from Nº1 soaking it. (if it is leaking, can the seal be changed easily?)
    In yellow Nº3, after the clean up, this part seems pretty dry, so i think it can be ruled out
    bmw inj pump leaking points.jpg

    Many thanks dude for the link to the non return valve. now can go forward with it, but i will follow your advice, first check the intank pump as it can be the culprit for difficulty in starting with 1/4 tank and letting air into the system. As it is with leak, on normal driving am averaging 9.8lts/100km and with a heavy foot around 10.9/11lts /100km. for a car this age i dont think i can get lower than 9lts/100km? besides the diesel quality here is poor.

    Below is a pic of the car, today exactly one week after purchase. After fixing the leak issue and a knocking sound on the left front wheel (absorbers and arms to be change) i will redo the roof cloth, actually its beige in color and nearing its end of life, am think of black alcantara and change the grey leather seats to black ones too. later on i will look for a facelift bumber. if any money left--the headlights as one of them look greyish. (previous owner dint took care of the car)
    011220122758.jpg011220122760.jpg

    Thanks for all your help mate, really appreciate it. Have a great weekend (mine will be fully with car, fixing and cleaning). hope to be able to fully identified all leaks on the pump and let you know how its going.

    Cheers
    Julio
     
     

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    E36 TDS (01-12-2012)

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