Intro: Replacing AC Idler Pulley on My Honda Civic 1999
First the power steering pump belt has to be removed. The stone guard also needs to come down (taking off the left wheel is necessary).
Step 1: Slacken the Old Idler Pulley.
The centre nut is 14mm and has to be removed with its washer. Also the tightening bolt (10mm) needs to be backed off. Once done, the belt and pulley will come out.
Step 2: Comparison.
The old pulley has a sheath for the bolt. This was removed using the 3/8inch extension bar and placing the pullet on top of it. Just by tapping it, the sheath came out.
To put the sheath onto the new pulley, I used an 18mm socket to brace the inner bearing race and lightly hammer tap the sheath in. The orientation of the sheath is critical!
Step 3: Installation of New Pulley.
Installation is the reverse of removal. Once the belt was tensioned, the pulley nut was tightened. Now my car has a brand new AC idler pulley and I plan on buying a couple more since this pulley tends to fail easily.