How to Replace an Air Injection Pump Belt

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The air injection system introduces oxygen into the exhaust to reduce emissions. The heart of the air injection system is the air pump, or smog pump.

Most modern air pumps are electric, but older ones are belt-driven. The belt can be either a v-belt or serpentine belt design. Over time, the air pump belt may wear out or show signs of malfunction. Here is a guide on what to do when it's time to replace it.

Part 1 of 5: Prepare to replace the air injection pump belt

Materials Needed

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Step 1: Locate the belt routing diagram. Before you remove the old belt, locate the belt routing diagram. This will help you install the new belt correctly.

Most of the time, the belt routing diagram can be found inside the engine compartment. If it is not, consult the repair manual for your vehicle for it.

Part 2 of 5: Remove the serpentine belt if equipped

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Step 1: Move the tensioner. Use a ratchet or dedicated serpentine belt tool to push or pull the tensioner away from the belt.

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  • Note: Some tensioners have a slot for inserting a ⅜” ratchet head end into while others have a traditional bolt head.

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Step 2: Remove the belt. While still holding the tensioner in place, slide the belt off the pulleys.

Part 3 of 5: Install the serpentine belt

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Step 1: Consult the belt routing diagram. Consult the belt routing diagram and ensure that you know how to install the belt correctly.

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Step 2: Move the tensioner. Push or pull on the tensioner so that the new belt can be positioned on the pulleys.

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Step 3: Install the belt. Slide the new belt onto the pulleys and let go of the tensioner.

Double check the belt diagram to ensure that your new belt is routed correctly.

Part 4 of 5: Remove the v-belt if equipped

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Step 1: Loosen the mounting bolts. Loosen the pump mounting bolts and/or adjustment bracket bolts but do not remove them.

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Step 2: Move the pump. Move the pump inward until the belt can be removed.

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Step 3: Remove the belt. Slide the belt off the pulleys.

Part 5 of 5: Install the v-belt

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Step 1: Install the new belt. Consult the belt routing diagram to ensure that you know how to install the belt. Install the belt over the pulleys.

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Step 2: Put the pump back. Move the pump back into place. The belt should have about ½” of deflection if the belt is properly tensioned.

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Step 3: Tighten the pump mounting bolts. Tighten the pump mounting bolts and/or adjustment bolts down until they are snug.

Double check the belt routing diagram to verify that the belt is routed correctly.

You should now have a nice new air pump belt installed. If this seems like something you’d prefer to leave to the professionals, YourMechanic offers an expert air pump belt replacement service.


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Daniel

10 years of experience
104 reviews
Daniel
10 years of experience
Hyundai Santa Fe - Serpentine/Drive Belt - Chicago, Illinois
Notified me that he was available sooner, which worked out great for me. Open communication, bilingual and fast service. Would definitely recommend. Thank you!
Ram 1500 - Serpentine/Drive Belt - Schaumburg, Illinois
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Kenneth

19 years of experience
526 reviews
Kenneth
19 years of experience
Mercedes-Benz C300 - Serpentine/Drive Belt - Los Angeles, California
Very knowledgeable, outstanding and most importantly very patient He takes things very easy and made me feel like l have known him for years. A very humble person. Strongly recommended. Thank you Kenneth and Thank you yourmechanic for sending me a good person.
Toyota Sequoia - Serpentine/Drive Belt - Newport Beach, California
Kenneth is so awesome. He walks you through everything and let's you know the truth, of what you really need to maintain and service your ride. Thanks Kenneth.

Joshua

31 years of experience
1 reviews
Joshua
31 years of experience
Nissan Pathfinder - Serpentine/Drive Belt - Oakley, California
Joshua's service today was professional and friendly. I appreciate how he took the time to explain the service he was performing and also how he took time to explain his recommendations for future services. At this point, although the service was just performed today, I certainly would recommend Joshua and would also personally request he service my car in the future.

Nathaniel

9 years of experience
162 reviews
Nathaniel
9 years of experience
Buick Encore - Serpentine/Drive Belt - Virginia Beach, Virginia
Nate Cobb was an excellent and personable mechanic who certainly knew what he was doing. First of all, what was described as a thermostat replacement job turned out to be something much different. He quickly and correctly diagnosed the problem, used his knowledge of the local automotive part dealers to get the required parts and then proceeded to do the required repairs. Despite close to freezing temperatures, he maintained a cheerful attitude and was courteous and pleasant throughout what was an ordeal. A top notch “Your Mechanic “.

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