Timing Belt Tensioner

Caution: Only tension the timing belt counterclockwise.

An automatic timing belt tensioner ensures the correct timing belt tension. When fitting a new timing belt move the tensioner into its basic position (pointer (3) and mark (2) line up). This basic adjustment is carried out by means of a cam (4). An additional spring-loaded cam provides correct belt tension during operation. The belt tensioner can operate 30 degrees either side of its central position.

Note: The timing belt must not be re-tensioned in case the operating range of the tensioner is exceeded. The basic adjustment of the belt tensioner only applies to new timing belts. Re-tensioning the belt can cause it to tear or flap.

Caution: Always install a new timing belt after slackening/removing it.

The basic adjustment of the belt tensioner can no longer be controlled after the aligning tools and adjusting pin have been taken out (the spring forces from the valve train exert pressure on the timing belt and alter the position of the belt tensioner).