For engine serial no. from 3188689

Fig 1: Identifying Belt Between Intake Camshaft Pulley, Idler Pulley And Crankshaft

Courtesy of VOLVO CARS OF NORTH AMERICA.

Tension the timing belt as follows: 

• turn the crankshaft clockwise carefully until the timing belt is tensioned. The belt must be tensioned between the intake camshaft pulley, the idler pulley and the crankshaft
• hold the center screw on the belt tensioner fixed. Turn the belt tensioner eccentric clockwise  until the tensioner indicator passes the marked position.

  Then turn the eccentric back so that the indicator reaches the marked position in the center of the window

• Secure the eccentric and tighten the center screw to 20 Nm  .

Check that the indicator is in the correct position.