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300 Tdi Rebuild

Discussion in '300 TDi' started by Al2O3, Mar 11, 2017.

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  1. raywin

    raywin Well-Known Member

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    You probably have spent more time on this than most people but the TD5 setup looks like this.
    The actuator is controlled by the discharge air pressure

    P5051603.jpg
     
  2. ifloochies

    ifloochies Well-Known Member

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    @Al2O3 , at this stage I think the only outstanding variable is oil weight.
    I'm sure the 300Tdi wouldn't be too bothered running on some SAE50 oil with summer coming, just to see if it puts a cap on your oil consumption.
    To be honest, saw your latest update from yesterday and went like, "oh crap, still??"
     
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  3. Al2O3

    Al2O3 Well-Known Member

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    That's the bit I didn't get. I can see what you're saying now. :)
     
  4. Al2O3

    Al2O3 Well-Known Member

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    Good picture! Yeah, I know the basics of how the turbo works. It was the bit about the pressure curve I found a bit vague in your first post about it :oops:
     
  5. raywin

    raywin Well-Known Member

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    May be miles off, but its difficult to try and think of something you haven't already covered, you must be getting a bit frustrated by now.
     
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  6. Al2O3

    Al2O3 Well-Known Member

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    Yeah, I know. It's becoming a living pain in the backside. :rolleyes:
    I wish it was as simple as oil weight. I very much doubt that's going to be it though, mate.
    My turbos should not be passing oil the way they do, not even lighter oil.

    So, slim chance but I'll change the oil stat. I've bought a brand new genuine LR one, so it might as well go in.
    I know the turbo is still passing oil because I can see it in the inter-cooler pipework. However, next I'm going to set up my temporary air filter again in order to bypass the turbo. I'll let the outlet of the turbo exit out on to the inner wing again, take it for a spin, just to see what's coming through. If this is a positive test, which I'm sure it will be, then I can only think rebuilding the turbo with another CHRA is my next move. Oil stat first though, you never know my luck! .........................actually in relation to my turbo, I think I do ;)
     
  7. Al2O3

    Al2O3 Well-Known Member

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    Certainly am!
    I'm longing for a clean running engine.
    It's embarrassing when you have to stop, say at a junction, because you know folk stood on the path are getting gassed out with the smell of burning engine oil. :(
     
  8. neilly

    neilly Well-Known Member

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    Silly Question time,

    are you sure it is oil, and not diesel ?

    Cheers
     
  9. Al2O3

    Al2O3 Well-Known Member

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    Hello neilly! :)
    I think that is a very interesting question. Because, when I start her up, especially when hot, I get a small puff of black smoke.
    However, the oil level goes down and if I take the turbo outlet pipe off, the inner wing gets sprayed with oil!
    So, maybe a few things going on, but the turbo passing oil is the priority at the mo. :)
     
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  10. neilly

    neilly Well-Known Member

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    OK, still sounds like you have the old oil passing issue.

    Cheers
     
  11. Al2O3

    Al2O3 Well-Known Member

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    Certainly have, it's a bugger :rolleyes:
     
  12. neilly

    neilly Well-Known Member

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    Now, I know you are invested in the rebuild and the multiple turbos etc. But have you thought about getting another 300tdi engine to replace it? then you could look in depth at what could be the problem and break it down piece by piece.

    Cheers
     
  13. Al2O3

    Al2O3 Well-Known Member

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    Yes, I have entertained such thoughts. I suppose it's difficult to admit you've rebuilt a sh@t engine :(
    I know JM is convinced it's the honing of the bores, but I'm not so sure. The turbo is certainly passing oil and, I think, it's responsible for all of the oil consumption. JM is usually right though, so my rebuilt engine is probably sh@gged :D
     
  14. neilly

    neilly Well-Known Member

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    I know it would be a PITA, but it would give you options. At least you could rehone the cylinders, I thought when you did them JM said they were good??

    Plus you could try the new turbo on the other engine, I Understand as a retiree it would give you something to do...LOL.

    Cheers
     
  15. Al2O3

    Al2O3 Well-Known Member

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    No, right from the start of the oil consumption JM said honing. However, I've bypassed the turbo once already and it was pi$$ing oil out on to the inner wing. So, despite JM's summation, I'm pinning my hopes on knackered turbos. knackered by a kink in the oil outlet pipe causing back pressure and the HP oil feed forcing oil through the ring seals.
     
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  16. Henry_b

    Henry_b V8

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    Whats the Crankcase pressure like?

    Considering the fact it's gone through a few turbo's all with the same issue, and associated pipework, excessive pressure will affect the oil feed to the turbo and acts as a restriction to the oil feed pipe, which can cause oil to leak either into the Compressor/turbine.

    Personally i'd pull that engine instead of spending too much more on it..
     
  17. Al2O3

    Al2O3 Well-Known Member

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    How would you test it accurately? Buy a pressure gauge?
     
  18. Henry_b

    Henry_b V8

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    Easiest way is to pop the oil cap off when it's running..
    If it chuffs like a steam train then expect excessive blowby/crankcase pressure.

    Also you can rest the oil cap over the hole, and if it tries to fly off, then that's part of your issue.
     
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  19. Al2O3

    Al2O3 Well-Known Member

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    Yeah, I've already done that, Henry. All seems fine.
     
  20. raywin

    raywin Well-Known Member

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    When I rebuilt my engine I took off the oil breather and put my hand over it just to see how quickly it built up, second time I did it it blew the plastic cam shaft seal out with a whoosh.
     
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