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300 Tdi Rebuild

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

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  1. windy81

    windy81 Well-Known Member

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    not sure but im topping up often. I'm living with it as it drives really well
     
  2. Al2O3

    Al2O3 Well-Known Member Full Member

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    When I checked mine over a series of weeks I was putting in about 250ml - 300ml approximately every 300 miles. Which is effectively 1ml per mile. That was about two turbos and an oil return pipe or two ago. However, I can't see it being much better now. When I took the head off, as part of the investigations, the carbon build up on the piston crowns was quite scary. I'm reluctant to drive mine too much because of this. I know they're affectionately referred to as oil burners, but I don't think they are that good at burning engine oil effectively. Probably too many additives in it.
    It was so thick I was wondering how I didn't have valve impressions stamped in to it. Made me think I should have a thinner head gasket on. I erred on the side of caution when I did the rebuild.
     
  3. Al2O3

    Al2O3 Well-Known Member Full Member

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    I need to use the Landy tomorrow morning so took the new down pipe back off and put the old one back on. Pointless filling a new CAT with soot
    20210407_174312.jpg
    It's all safely wrapped up in it's plastic bag, ready for when the turbo is sorted o_O :mad:
     
  4. Al2O3

    Al2O3 Well-Known Member Full Member

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    I've been using the Landy every day for the last few weeks as I'm clearing out grey squirrels from some woods about 2 miles away. You have to go down a very rough track and then across a few fields so the focus is a non starter. Yesterday and today were warm enough for me to come back across the fields with the window down. The fumes from the burning oil were awful, so it has turned my attention back to trying to find the problem.
    All I can think to do is go through everything I've already done again. Perhaps checking things differently to see if I can fine the cause.
    So, working from the premise that it must be related to either too much oil or too high an oil pressure going in. Or, a restriction of the oil leaving via the return.
    Things I've done and need to go through again:
    • Oil return pipe
    • Piston ring blow by
    • Valve seat and stem blow by
    • Breather pipes/system
    • Vacuum pump leaking or vac pipe leaking
    • Servo leaking
    • Catalytic converter blocked
    If anyone can think of anything I've missed and need to check I'd be very grateful if you let me know. I'm struggling for new ideas so will consider any thoughts.
    If anyone can suggest how I should be testing any of the above I'd also be very grateful if you let me know. I think I need to check things in a different way.

    I've still got the options of fitting a pressure regulator (which I'm pretty sure will reduce the volumetric flow too) Although I know I shouldn't need one. And, taking it to the local Indie to see if they can deduce what is wrong.

    All ideas welcomed. (fingers crossed emoji) :)
     
  5. EeEk

    EeEk Active Member

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    You will get more oil out of the turbo outlet with no pipes attached....venturi effect will suck it out as there is massive airflow and no boost pressure to hold it back.
     
  6. Al2O3

    Al2O3 Well-Known Member Full Member

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    That's an interesting thought. When the outlet pipe is attached it gets lined with oil though :(
     
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