Timing Belt Tensioner

Part 1 of 2





Part 2 of 2

Timing Belt Tensioner

CAUTION: Only tension the timing belt by turning in a counterclockwise direction.

An automatic timing belt tensioner ensures that the belt has the correct tension. When a new belt is fitted, the tensioner is moved into the base setting (arrowhead (3) and marker (2) are in line). This base setting is taken up by one of the cams (4). Another (spring-loaded) cam ensures that the belt is kept at the correct tension when the engine is running. The belt tensioner moves up to 30 degrees from its center position in each direction.

NOTE: Do not re-tighten the belt since there is a risk of exceeding the permitted working range in one of the directions The belt tensioner base setting only applies in the case of new timing belts. Re-tightening of the belt can cause it to rip or flutter.

It is no longer possible to check the base setting once the adjustment tools and pin have been removed (the spring forces of the valve train are exerted on the belt and change the position of the belt tensioner).