Air Filters

Even during low speed operation, the engine pulls in a tremendous volume of air. This air has a great deal of abrasive particles, which must be prevented from entering the engine. The air cleaner traps the abrasive particles before they can enter the engine. In so doing, however, it clogs itself. The air filter should be checked every other month.

Cars with fuel injection typically have an air filter element located in an air induction assembly like the one shown below. The filter element is located in a rectangular box called the air cleaner housing. The element may be removed by unlatching a series of clamps or unscrewing a series of screws.

Cars with carburetors or throttle body fuel injection often have a large round air cleaner assembly mounted on top of the carburetor. The filter is located inside the air cleaner housing. Remove the top of the air cleaner by taking off a single wing nut as shown below.

To inspect or change the air filter element:

1. First loosen and remove the latches, screws, or wing nut. Remove the cover and then the air filter element.
2. Carefully inspect the air filter element. You will find dirt and oil on one side of the filter element. This material has been trapped by the filter material. Any dirt and oil buildup on the filter means it should be changed.
3. Place the new filter element next to the old one on the work bench. Carefully compare the two filter elements. Both must have the same dimensions. The gaskets on the top and the bottom of the filter elements must be exactly the same.
4. Place the new air filter element in the air filter housing . Make sure the gasket surface is aligned on both the top and bottom.
5. Replace the cover and tighten the latches, screws, or wing nut until snug. The air filter gasket must fit correctly and seal properly. A light coat of grease on the air cleaner gasket of an older car can improve the seal between the air cleaner housing and the air filter element.