NAPA Auto Parts NAPA Montréal
2085 AV HAIG
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  • Air Filter Replacement


Person changing an air filter on an automobile.

Difficulty: Easy
Duration: 5-10 minutes
How often: every 20000 km

The air filter and positive crankcase ventilation (PCV) valve are important parts of your vehicle's fuel system. The air filter provides clean air to a vehicle's carburetion system, and, if it becomes clogged or dirty, it can cause your car to idle or run roughly and reduce gas mileage. The PCV valve helps prevent the release of gas fumes from the engine. If it becomes blocked or clogged, it can cause oil leaks and promote the formation of sludge in the engine.

You should check your air filter every six months and replace it according to the vehicle manufacturer's recommendations. If you're unsure, replace the filter every 12 months or 12,000 miles (20,000 kilometers), or sooner if the vehicle is operated in extremely dusty conditions. Replace the filter when it appears dirty or clogged. Replace the crankcase breather filter at the same time if it's dirty. Check the PCV valve and any related hoses whenever you check or replace the air filter. It's also a good idea to check the fuel filter, spark plugs, points, condenser, cap, rotor and wires.



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  • Assorted Wrenches


Proper maintenance and service procedures are vital to the safe, efficient operation of all motor vehicles, as well as to the safety of the person performing the work—you.

Whenever you are working on your vehicle, we recommend that you follow these important safety rules:

  • Do have a first-aid kit handy.
  • Do be careful when working around hot or sharp objects.
  • Do follow the manufacturer's instructions for all products.
  • Do use safety stands under the frame or drive-on ramps if you must raise your vehicle.
  • Don't run the engine without proper ventilation.
  • Don't smoke when working around the engine.


Read these instructions completely before you begin:

These instructions will help you replace paper-type carburetor air filters and air cleaner-mounted crankcase breather filters.

Removing the Old Air Filter

Figure 1   Figure 2

  • Raise the hood and find the air cleaner assembly. It's the round can located on top of the carburetor.
  • Remove the wing nut on top of the can, or remove the retaining clips located around the edge of the can.
  • Lift off the top pan and set it aside. (Diagram 1) You probably won't have to disconnect any hoses, but, if you do, make sure to label and reattach them in their original positions. If necessary, make a drawing to help you.
  • Remove the old air filter cartridge and dispose of it properly. (Diagram 2)

Checking Crankcase Breather Filter

Figure 3   Figure 4

  • The crankcase breather filter is usually located around the edge of the air cleaner can.
  • Remove the filter. Sometimes it will simply lift out, but some breather filters are held in place by a clip. Remove the clip (and the hose, if necessary) and the filter will come out. (Diagram 3)
  • Inspect the filter. If it's dirty, dispose of it properly.
  • Wipe the inside of the air cleaner can with a clean rag. (Diagram 4)
  • If necessary, replace the crankcase breather filter (and the clip and hose, if removed).

Installing the New Air Filter

  • Drop the new filter into place in the air cleaner can.
  • Replace the lid and finger-tighten the wing nut so it's snug or snap the retaining clips around the edge of the can back into place.
  • Make sure any hoses you remove are replaced in their original positions.

Replacing the PCV Valve

Figure 5   Figure 6   Figure 7   Figure 8

  • The PCV valve is usually located at the end of a hose running from the air cleaner to the engine valve cover. Likely locations of the valve (Diagram 5) are in the valve cover (1-2), at the carburetor (3) or in the intake manifold (4). Diesel engines do not have a PCV valve.
  • Pull the valve from the grommet. (Diagram 6)
  • A PCV valve that is functioning properly will usually rattle when shaken.
  • If the valve is held in place with a hose clamp, squeeze the hose clamp apart with pliers. Remove the valve from the end of the hose. (Diagram 7)
  • Check to be sure that the hose is not clogged or brittled. If it is, it should be replaced.
  • Insert a new PCV valve into the end of the hose. (Diagram 8).
  • Reinstall the hose clamp (if present).
  • Push the PCV valve back into the grommet. Be sure the other end of the hose is properly connected.


  • Follow these instructions carefully. Read and be sure you understand them before you begin.
  • Gather all your tools and supplies before you begin.
  • Allow plenty of time to do the job so you don't have to hurry.
  • Remember that these are general instructions. For more detailed instructions pertaining to your specific vehicle, consult an appropriate repair manual.
  • Safety is important whenever you're working around machinery. Beware of hot objects, sharp instruments and hazardous materials.
  • Don't substitute tools unless you are sure you won't compromise either your safety or the performance of your vehicle.
  • If you have any questions about repair and maintenance, contact your local NAPA Auto Parts store. Find the nearest NAPA Auto Parts location.