Some models of Subaru engines can be served in a very unusual way.
Faults in the belt drive systems, Subaru Forester, Impreza, Liberty, Legacy and the Outback, equipped with gasoline engines (1.5, 1.6, 2.0, 2.2 and 2.5 liter) and manual transmission, often occur because of errors in performing maintenance.
Experts have determined that, due to installation errors in problem models, timing belt guide plate can lead to premature failure of the system and serious engine damage.
The plate is located directly above the crankshaft pulley, very close to the timing belt. According to the automaker specifications, gap between the belt and the guide should be in the range from 0.5 mm to 1 mm. It is necessary to prevent contact between the belt and the cover while the engine is running, since at their contact will be friction, and the excess heat will be allocated, which will lead to accelerated failure.
During installation of the guide plate, spacer is inserted between the belt and the plate, while respecting the mounting position and the working gap. After tightening of the fixing bolts reusable spacer is simply removed using the “expansion tongue.”