Timing Belt Tensioner Replacement Cost Estimate

Diagnosis of a failed or failing tensioner requires removal of many components, and hands on inspection of the timing belt tensioner. If the servicing technician finds the pulley is loose or damaged in any way, they will recommend immediate replacement of, at minimum, the timing belt and timing belt tensioner pulley.

At a minimum, replacement involves removal of the timing cover, timing belt tensioner, timing belt, and the timing belt pulley. The timing belt tensioner is typically attached by one bolt, but installation requires the proper amount of tension to be applied to the timing belt, and idler pulley retaining bolt. Once all components are replaced, the timing components can be installed onto the engine, and the engine will be tested for proper operation and timing before additional components are replaced.

Since this service requires removal of the timing belt, it is recommended to replace the timing belt, water pump, and possibly front seals at the same time, unless they have been recently serviced. This is much more cost effective than returning for the same service after a partial service interval has elapsed.

It may be necessary for the motor mounts to be removed from the vehicle, as well as engine cooling fans, the radiator, and all engine accessories. This may include components like the alternator, A/C compressor, mounting brackets, coolant or fuel lines, and any other component that interfere with access to the timing belt cover.

Since timing belt tensioner replacement necessitates the removal of timing components, it is not recommended for the DIYer to attempt this task. A thorough knowledge of internal engine components, engine timing, additional systems, and several specialty tools are required to properly perform this repair.