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It is not necessary to rotate the engine one turn after installation. My test of the timing belt installation is to rotate the engine one turn clockwise, and then one turn counter-clockwise. Then the marks will line up - or should.
Usually what I find is that the tensioner bolt isn't tight enough and the belt slips a tooth or two. Rats! But better to fix it now than later.
Once the engine runs, the marks may never ever line up again. The marks are only for belt installation, after which they are meaningless.
Good Luck,
Bob
:>)
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