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Do *NOT* turn the engine by turning the sprocket on the camshaft. You would be using the timing belt to rotate the engine. You can, however, turn the engine clockwise by the crankshaft pulley bolt, with the valve cover off, in order to inspect the timing belt throughout its full length.
That will not mess up the timing. This is exactly what happens when the engine is operating, the crankshaft drives the camshaft sprocket through the timing belt.
But, if the timing belt has not been changed at 120k, then you are *way* overdue and running on borrowed time. The 4AFE engine is non-interference so a timing belt failure will not destroy the head, but will definitely leave you stranded.
I know that at around 90k the timing belt squeals a bit and the tensioner rattles but that is quite difficult to hear if you do not know exactly what to listen for. Do not confuse it with squeals from the accessory belt for alternator, water pump, which are horribly loud in comparison.
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