An interference engine chart lists interference engines by year, make, model and engine size. When the pistons and valves of an engine make contact during a timing belt failure, the engine is an interference engine.
Many modern engines are considered interference engines. When the engine’s timing belt breaks, the pistons can rotate freely. In an interference engine, this causes the valves and pistons to come in contact, resulting in catastrophic engine failure. The information in an interference engine chart is of particular importance for automotive technicians. Many repairs involve the removal of the engine’s timing belt, and it is crucial to know whether the engine can be rotated with the timing belt off. Any vehicle owner should also know whether her vehicle has an interference engine, as it is an important maintenance consideration. Timing belt maintenance is extremely important, and failure to change the timing belt at the proper intervals can result in costly engine repair.