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With the block on an engine stand and the crank vertical, you can use a prybar against a web to move it up and down.
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Don't rely on the feeler gauge.
Clean everything up, and check the end float with a DTI gauge DRY - don't have any oil or grease in there as the reading will be wrong.
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So now I'm perplexed as to what the source of the growl. I'll replace the throw-out bearing, just because. Not all is lost. This engine always leaked, so I can fix that and give it a nice paint job. Sigh.
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The thrusts on a Mini crank are not pressure fed, they're lubricated by leaking oil from the centre main.
Starting the engine with your foot on the clutch (like a modern car with it's 'safety' feature...) is a dreadfully bad thing to do as there is effectively no oil on the bearing face. With a heavy race clutch spring it is possible to wipe out the thrusts in very short order.
Sitting with the car in gear and the clutch depressed at a junction, will do a similar thing - I try not to have the clutch down for more than 5-10 seconds without releasing it.
Good luck with the strip down - we're here with sage words of advice as you go.
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Could be the thrust bearings.
Watch the crank pulley as someone presses the clutch with the engine running - if there's something icky going on it will move in and out.
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