DISASTER!

Discussion in 'Mech Tech' started by Soggz, Jul 2, 2023.

  1. Other bearings: I'd give them a good visual inspection, cam and big end. They're likely ok. Would be good to measure your big end journels, see if they've been ground in the past.

    Your bloke should've done all of this.
     
  2. Measure:
    - diameter of main crank journals. May or may not have been ground.
    - diameter of bearing webs in the case. Tricky with calipers, but can be done. If matey is correct the they should be 0.5mm oversize after his line bore.
    - diameter of big end journals on crank
    - should measure the thrust cut on the end web, but we assume that's correct. Worth measuring anyway.
     
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  3. mikedjames

    mikedjames Supporter

    You can buy cheap bore gauge sets that simply spring out two fingers to the outside of the bore, then you lock them, remove them and measure with calipers.
     
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  4. Soggz

    Soggz Supporter

    7693B654-F687-4781-999B-BE42E2FBBA17.jpeg 61CC5A7A-4B7E-44D8-A501-726802C4DA4B.jpeg My calipers arnt the best
     
  5. Soggz

    Soggz Supporter

  6. Soggz

    Soggz Supporter

    The crank journals are 55 Ish ( depending on my calipers).
     
  7. Are they zero'd properly ;)
     
  8. Soggz

    Soggz Supporter

    Yes. They are just sketchy.
     
  9. Soggz

    Soggz Supporter

    They ARE the bearings I need, apparently.
    I just had it confirmed by my ‘Guru’…:D
     
  10. Zed

    Zed Gradually getting grumpier

    What's written on the bearing you're measuring and is it the one from the engine or your "new" set?
    Look at both, tell us the markings please.
    looks like 0.5 over case and as bearings do crush, I'd guess a matching bearing, but I don't know what you're showing us.
     
  11. Soggz

    Soggz Supporter

    Ok.
    The pic of the bearing earlier on with the numbers on,is the ones from my engine. I havnt got the ‘new’ set yet, but the pic from Heretidge are the same ones, somI have been told.
     
  12. Soggz

    Soggz Supporter

    E2CC585D-37F0-4471-96D3-BC7BE7F01D59.jpeg This is mine, from the case.
     
  13. Zed

    Zed Gradually getting grumpier

    OK. Your measuring is not good enough to deduce anything. The case doesn't appear to be line bored, so was it just the thrust that was cut?
    Stock bearings would be obviously loose in a cut case. 0.5mm is huge in terms of engine measuring.
     
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  14. The "STD" would imply to me that the ID and OD are standard values, not 0.5 oversize on the OD which I assume you would need after the line bore.
     
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  15. ^this. Can't really determine anything. At the mo, it implies the bearing shells are too big to fit in the case...
     
  16. Zed

    Zed Gradually getting grumpier

    Correct, they don't mark them std/std.
     
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  17. Soggz

    Soggz Supporter

    It’s the ones That was put in the case. The thrust was cut to 21, so one over?
     
  18. The thrust cut is fine. 0.01mm isn't significant.
     
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  19. Soggz

    Soggz Supporter

    Ok. So you are saying that it hasn’t had a align bore, just a thrust cut?
    The bearings are tight in the case,as I had to prise them carefully out. The thrust bearing is tight as when you go to take it out, the case comes with it until the weight of the case releases the bearing. Yes. Those callipers arnt the best.
     
  20. Soggz

    Soggz Supporter

    So…I don’t understand why I have them in there,then…
     

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