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Take the timing cover off, and DO NOT loosen the tensioner pulley, BUT check for alignment of the gears.
Check tension of the belt, on the long side, by twanging it with one finger (putting one finger under the belt in the center of the long side, and pulling lightly out and allowing the belt to vibrate.) if it doesn't twang for 2 to almost 3 seconds after you do this (vibrate for almost 3 seconds, then it's too loose.)
A special tool is normally used to tighten this belt after loosening the large nut holding it.
After adjustment, turn the engine over with the crank nut 3 full revolutions, then recheck belt tension.
The main next thing to check, is the amount of printed ink still remaining on the back side of the belt.
To check the ink: turn the engine over with only the crankshaft pulley bolt, NEVER by the timing gear bolt, until the printed ink comes into view.
The ink is bright white or yellow when the belt is new.
When the ink is 90% gone, then the belt is 90% worn.
This is a freewheeling engine, so if the belt breaks, it will not normally damage the valves.
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