How are Timing Chain Idler Pulley issues diagnosed?
Diagnosis of a failed or failing idler pulley requires removal of many components, and hands on inspection of the idler pulley. 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 idler pulley.
How are Timing Chain Idler Pulleys replaced?
At a minimum, replacement involves removal of the timing cover, timing belt tensioner, timing belt, and, finally the timing belt pulley. When this service is performed, it is common to replace the timing belt, water pump, and seals. 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.
RepairPal Recommendations for Timing Chain Idler Pulley issues
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.
What to look out for when dealing with Timing Chain Idler Pulley issues
Some engines use more than one timing belt idler pulley, which affects the cost of the repair slightly. The pulley can fail at random, especially if debris is pinched between the timing belt and the idler pulley. 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.
Can I replace the Timing Chain Idler Pulley myself?
Since timing belt idler pulley 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, and several specialty tools are required to properly perform this repair.
