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The idler pully is mounted on an eccentric cam - and by turing the cam either clockwise or counterclockwise…you will realize that it is possible to acquire two “more or less correct” roller to belt clearance readings, but only one of these will offer the correct readings at the appropriate belt tension.
My guess is that you should loosen the roller cam nut, move the roller over to the other "correct" position, and fine tune the tension and clearances at that position.
My interpretation of the correct clearances has always been .5mm between upper belt and pully, and 1mm below, and I’ve always done this and it works fine (Van Svenson has a good video illustrating this). Some folks actually use a piece of an old credit card as a feeler gauge to measure this upper distance…and some simply spin the idler manually and note that only the slightest finger pressure on the belt will stop the idler from spinning.
Last edited by OK-944; 11-16-2025 at 04:28 AM..
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