Replacing the timing belt/idler pulley/belt tensioner: Check

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Fig 1: View Of Pressing Belt To Check That Indicator On Tensioner Moves Easily

Courtesy of VOLVO CARS OF NORTH AMERICA.

Checking markings:

Press the belt to check that the indicator on the belt tensioner moves easily.
Install the upper timing belt cover.
Turn the crankshaft 2 turns and check that the markings on the crankshaft and camshaft pulley correspond.
Check that the indicator on the belt tensioner is within the marked area.