Even with the advanced computer systems that keep your vehicle running efficiently, you still have mechanical parts that could fail. These could be internal, such as a valve, piston, camshaft, timing chain or belt, or one of the engine’s accessories, such as the water pump.
All of the external parts eventually wear out and need to be replaced. Some of the parts require replacement as part of the vehicle’s maintenance program. These include the timing belt or timing chain, spark plugs, radiator hoses and serpentine belts. When you keep up with the maintenance, you are less likely to experience major engine failures.
For example, if you do not change the serpentine belt and it stretches past its useful life, it could slide on the pulleys instead of turning them. If the belt does not turn the water pump, you could easily overheat the engine, blow a head gasket, or do other damage. If the belt turns a mechanical fan and the fan doesn’t turn, you could also overheat the engine.