Worn AFM carbon track

Discussion in 'Mech Tech' started by AndyC, Jan 8, 2020.

  1. Does this carbon track look worn on my AFM?

    [​IMG]
     
  2. Yes :(
     
    Moons likes this.
  3. davidoft

    davidoft Sponsor

  4. Dubs

    Dubs Sponsor supporter extraordinaire

  5. Sproggy4830

    Sproggy4830 Supporter

    What's an AFM
     
    crossy2112 likes this.
  6. Air Flow Meter

    On our jazzy FI buses
     
    IZZYBAY likes this.
  7. It does appear worn. Could maybe check continuety with an ohm meter.
     
  8. Your injection ECU is going to get mighty confused by that, as the track is worn/non-existent in places. There's no carbon track where you can see the white substrate.
     
    andyv likes this.
  9. mikedjames

    mikedjames Supporter

    Its a pity some enterprising person hasnt taken measurements off a 'good' one and then fitted an optical encoder( stick on disc with markings) and emulated the resistor track. Or made a converter from a modern AFM ...
     
    Iain McAvoy likes this.
  10. Bit modern for the old rubbing a pencil over the track dodge used on audio equipment of the vintage variety, not that I would have ever done that;)
     
    Davipon, Lasty and snotty like this.
  11. if you obtain another AFM make sure its a seven pin one for your model....the six pin is for 75/76 only.
     
  12. What grade of pencil would you use to match Bourn’s thick film ;)?
     
    Last edited: Jan 9, 2020
  13. crossy2112

    crossy2112 Supporter

    Just make sure you have enough lead in it :thumbsup:
     
  14. Sproggy4830

    Sproggy4830 Supporter

  15. Ooh got to be 6B:)
     
    Lasty and snotty like this.
  16. Could you bend the copper "U" thingy so it runs on a clean bit of track (slightly under the worn portion)?
     
    andyv likes this.
  17. mikedjames

    mikedjames Supporter

    EProbably a bit soft but there is carbon "aquadag" paint available on eBay..

    The original coating would have been some ceramic mixed with metal oxides and carbon.
    And then fired in a kiln.
     
    Last edited: Jan 10, 2020
    snotty likes this.
  18. Not a bad idea, but I'd doubt it would be as robust as the original stuff. I think they bake thick film on.
     
    Valveandy likes this.
  19. I've been quoted £185 + VAT to refurbish the AFM.

    Given that I can't find, and never have seen, a used Cali AFM, and this is the only company I've found who actually refurbish them, what do we think?
     
  20. Who is doing it, and what will they do?
     
    paradox likes this.

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