Type 4 crankshaft play with no flywheel

Discussion in 'Mech Tech' started by Deefer66, Jan 26, 2020.

  1. What's a reasonable 'float' before the flywheel goes on. Just notice how much it moves while checking valve stem/ rocker allignment..

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  2. I’d say measuring it is pointless, as there’s no flywheel thrust face to constrain the movement. Could be anything.
     
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  3. That's what I was thinking, but it felt a lot . ...back to it tonight then

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  4. It will likely be "a lot", as there's nothing really stopping the crank moving back and forth if the flywheel and shims aren't there.
     
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  5. I'm getting abour 3-4mm with no flywheel fitted
     
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  6. 77 Westy

    77 Westy Supporter

    Just under 2mm float with an 80mm counter-weighted crank. What you're measuring is the clearance between the crank webs and the bearing saddles and it's the minimum to be concerned about.
     
  7. Ta.. measuring at about 2.5mm.. not much use apart from comfort of knowing it's in the ball park of others.
    Only came about through crank rocking into distributor drive gear causing a clunk while valve allignment checking.
    Disi clamp must have come loose so it popped out, no harm done (phew!). Taken out till flywheel on now

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  8. 77 Westy

    77 Westy Supporter

    2.5mm is fine.
     
  9. mikedjames

    mikedjames Supporter

    On my T1, when the flywheel came unbolted while it was running it managed about 3-4mm endfloat, the crank bounced around a bit... So I had to ride the clutch to push it back as I drove it the last 3 miles home.

    That was on the principle of understanding what was wrong and that turning off the engine would result in a trip on the yellow taxi and the engine was knackered anyway.
     
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