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300 Tdi Rebuild

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

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  1. Al2O3

    Al2O3 Well-Known Member

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    Will do. Thanks for the heads up.
     
  2. Saint.V8

    Saint.V8 Dyed-in-the-wool 100% RR Junkie

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    I am not 100% sure what the thread is for the head bolts, so if you do go down the lifting eye route, get the correct thread type.

    You can get lifting eyes without the shank, you may be able to use one of the short head bolts and a female lifting eye....just remember which ever you use, place a large washer under the lifting eye to protect the head surface.

    I think they are called eye nuts.....get one with a thread size larger than the head bolt diameter - or drill out the thread in the eye (as a LEEA trained examiner - I didn't tell you that though!!)

    [​IMG]
     
  3. Al2O3

    Al2O3 Well-Known Member

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    Don't know what the threads are. I've got a metric set of taps and dies, so I've tried them. They're not metric.
    I'll have a search for female lifting eyes or eye nuts.
     
  4. jamesmartin

    jamesmartin Well-Known Member

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    metric just not 1.5
     
  5. neilly

    neilly Well-Known Member

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  6. Al2O3

    Al2O3 Well-Known Member

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    Never thought of that! :oops: I'm beginning to think you have done this before :rolleyes:
     
  7. jamesmartin

    jamesmartin Well-Known Member

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    years ago i had to fit a complete set of helicoils after someone tried cleaning his threads with a std pitch tap
     
  8. neilly

    neilly Well-Known Member

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    From the Zues book:

    Metric fine threads

    M10 x 1.25
    M12 x 1.25

    metric coarse

    M10 x 1.50
    M12 x 1.75

    Cheers
     
  9. Al2O3

    Al2O3 Well-Known Member

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    Sadly not, neilly.
    I've tried one of the smaller diameter bolts and it appears to be 10mm x 1.5mm. Went on easily by hand in the open position (not in wrench) did clean the thread a bit though.
    My 12mm die is x 1.75mm and it doesn't fit the larger bolts.
     
  10. Saint.V8

    Saint.V8 Dyed-in-the-wool 100% RR Junkie

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    Offer your M12 Tap up to the M12 Bolt and take a look at the thread patterns....see if you can 'interlink' the threads....might give you an idea if you have a 1.5 or 1.75 pitch.
     
  11. neilly

    neilly Well-Known Member

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    Shame,

    Well you can count the threads over 25mm and see what you get.

    That will allow you to work out the thread pitch.

    Cheers
     
  12. Al2O3

    Al2O3 Well-Known Member

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    Good idea. I'll go have a count of the threads over a set measurement.

    Did they realise in time or just couldn't torque the head down?
     
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  13. Al2O3

    Al2O3 Well-Known Member

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    We were typing at the same time there. I'll go and measure.
     
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  14. jamesmartin

    jamesmartin Well-Known Member

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    a couple of the bolts stripped their threads on the last 60 degrees
     
  15. Al2O3

    Al2O3 Well-Known Member

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    Right, I've had two bolts up against a measure. I'm cracking on a bit, my eyes are dim and my knees are knackered, so I used a magnifying glass :p
    17 threads over 25mm, so they must be 1.5 pitch.(17 x 1.5= 25.5mm) Why does my tap and die set have a 1.75mm pitch die, typical :rolleyes:

    At that point I bet he thought, 'Oh, sh@t' :(
     
  16. neilly

    neilly Well-Known Member

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    Diameter?

    Cheers
     
  17. jamesmartin

    jamesmartin Well-Known Member

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    its 1.75 in your set as thats std for 12mm bolt 1.5 for m10 and 1.25 for m8
     
  18. Al2O3

    Al2O3 Well-Known Member

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    [​IMG]
    Not lined up well for the camera, but 10mm and 12mm
    [​IMG]

    That's why these aren't standard then. They're M12x1.5
     
  19. jamesmartin

    jamesmartin Well-Known Member

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    yes
     
  20. neilly

    neilly Well-Known Member

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    Yep, I had to squint.....

    Does look like both are 1.5mm pitch.

    Cheers
     
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