My gearbox grinding solution

Discussion in 'Technical' started by smeath01, Aug 8, 2011.

  1. smeath01

    smeath01 New Member

    hey guys as you know i had a auto to manual conversion done and it went great for a short time until all of a sudden all gears were grinding, after a year with the problem of having to shift like a granny to prevent grinding we have come to the solution that the pilot bush has seized to the input shaft causing the crank to still spin the shaft even when the clutch disengages. after talking for a while with the mechanics who fitted the transmission we have come to this as hopefully whats wrong as i doubt all syncros went at the exact same time and they never replaced the bush and know the guys never probably lubed it either
    anyways cant sleep so i thought id let yas all know
     
  2. ryzan

    ryzan Moderator Staff Member

    Curious as to why you think it's the pilot bush? Not questioning it just curious. Does it make any noise while sitting in neutral? Also, I was under the impression that brass doesn't require lubrication.

    Just incase you were wondering... I also cannot sleep lol.
     
  3. badxtc

    badxtc kirby's bitch

    that cant happen.

    bleed your clutch
     
  4. Altari

    Altari '89 2+2 TT Manual

    To add to this, get a braided line and then bleed your clutch. So much easier. Gravity does 90% of the work for you.
     
  5. mungyz

    mungyz Well-Known Member

    Step one: remove gearbox

    Step two: remove torque converter bush and fit manual transmission pilot bush (oil before install)

    Step three: refit gear box and test drive

    Four: smile job is done

    While you are doing the above you will find the real problem, possibly a loose bolt or two on the flywheel jamming against the friction plate or a very poorly bled or adjusted clutch.

    There's very little chance of a pilot bush causing your trouble unless it's missing altogether - even then they normally go OK unless you try and shift at high RPM then the input shaft gets a big wobble on and makes a racket while making it hard to change gear.
     
  6. Chrispy

    Chrispy Pretentious Upstart

    You should force oil through the pilot bush to give it some lubrication.
     
  7. Mr 0uch

    Mr 0uch Bare footed zman

    Not if the brass bushing is solid lol :rolleyes:
     
  8. Chrispy

    Chrispy Pretentious Upstart

    They are all slightly porous. Block one end off, fill it with oil and then squeeze.
     
  9. mungyz

    mungyz Well-Known Member

    Exactly fill with oil and squeeze between your finger and thumb to "prime" the bush with oil (wearing gloves and safety glasses etc to follow OHS rules or just bare hands to follow man rules LOL!)

    The material used is called oilite if you go have a quick google you will find tonnes of info on them.
     

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