How to Replace an Air Injection Pump Belt | YourMechanic Advice

How to Replace an Air Injection Pump Belt

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

How to Replace an Air Injection Pump Belt 2

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

How to Replace an Air Injection Pump Belt 3

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

How to Replace an Air Injection Pump Belt 4

  • 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

How to Replace an Air Injection Pump Belt 6

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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Recent Serpentine/Drive Belt Replacement reviews

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YourMechanic Serpentine/Drive Belt Replacement Service

Average Rating

4.9/5

Number of Reviews

4,280

Rating Summary
4,086
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4,086
110
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47

Joseph

26 years of experience
571 reviews
Joseph
26 years of experience
Nissan Sentra - Serpentine/Drive Belt - Katy, Texas
Joseph was able to perform the work needed in a least cumbersome way, without taking off the wheel or lifting the car which was the proposed solution by local auto shops. The only suggestion would be to wear gloves for interior contact and have a towel since it gets hot in Texas.
BMW 328i - Serpentine/Drive Belt - Houston, Texas
Arrived early, very nice gentleman and very informative. Already discussed making another appt to have him make a repair to my Ford SUV.

Theodore

15 years of experience
1248 reviews
Theodore
15 years of experience
Honda Prelude - Serpentine/Drive Belt - Seattle, Washington
Theodore did a great job working on my old Honda I would recommend him to come to your house. He is very knowlegable
Ford F-150 - Serpentine/Drive Belt - Woodinville, Washington
Friendly, prompt, knowledgeable, and fast! Took time to explain what he was doing. Did not feel rushed. Will have Theo return for additional work.

Nolan

29 years of experience
51 reviews
Nolan
29 years of experience
Chevrolet Captiva Sport - Serpentine/Drive Belt - Tucson, Arizona
Very knowledgeable, he even checked my tires and put air in them, I also had one headlight out and he found out it was a fuse and he replaced it!

Nicholas

10 years of experience
381 reviews
Nicholas
10 years of experience
Chrysler Aspen - Serpentine/Drive Belt - Apex, North Carolina
Excellent service, as usual. Have used Nicholas in the past and he does not disappoint. Arrived early and was ready to work. Diagnosed the problem and took care of it in a very professional manner. Saved me both time and money. Very honest and up-front. Could not be more satisfied. Highly recommend. Will continue to use in the future.

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