S80 T6 Executive L6-2.8L Turbo VIN 90 B6284T (2001)
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Press the belt to check that the indicator on the tensioner moves easily
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install the upper timing belt cover
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turn the crankshaft 2 rotations; check that the markings on the crankshaft and timing gear pulleys align
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check that the indicator on the belt tensioner is within the marked area.