I recently had actually the satisfied of help my brother replace the air conditioning belt on his 1999 Nissan Altima. Most vehicles offered today either have actually one serpentine belt that weaves its way around all the pulleys, or two separate belts. In the instance of the Altima, the main belt cd driver the strength steering, alternator, and water pump. A second belt drives the air conditioning compressor.

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As a next note, reading the belt diagram or complying with the route of the belt is one easy way to recognize these automotive components.
This diagram is general representation of a 2 belt system. The red line represents the main belt and the blue line represents the secondary belt.
Luckily because that us, the AC belt was the outer-most belt. This expected we walk not need to take the main belt off in order to change the an additional belt.Whenever an altering a belt, friend will constantly have to relieve the belt tension. Some equipment use a spring loaded instantly adjusting me tensioner that have to be rotated to relax the tension. On the Altima, the belt anxiety is manually adjusted by a bolt. The belt tensioner pulley-block is attached to a pin that can slide increase or down in a bracket. Here are the steps taken to replace the belt:
Remove the bolt and also washer from the belt tensioner sheave (blue arrow)Remove the adjusting bolt (red arrow)Note how the pulley, pin, bracket, and also adjusting bolt walk together. Eliminate the pulley and inspect it. Lubricate or change if needed.Remove the old belt if taking keep in mind of how it is routed.Reinstall the the sheave assembly however do not tighten the bolts yet. The sheave should freely slide up and also down in the bracket.Install the new belt. Move the pulley to its highest allude in bespeak to obtain the belt on. It may still be a tight fit.Make sure the belt is correctly seated in each of the pulleys - the crankcase (engine), AC compressor, and also tensioner.Tighten the pulley-block bolt (blue arrow), climate tighten the adjusting bolt come 26 ft. Lbs.Check to make sure the belt is on strict enough. Come check, measure the quantity the belt will deflect when you press against it at a point fifty percent way in between two pulleys. The amount of deflection need to be around 1/4" If it deflects much more than that, tighten the adjusting bolt. If it does not deflect, climate it is too tight and you must loosen the adjusting bolt.It is likewise a good idea to clean the the pulleys as soon as you have the belt off. Friend should additionally check each pulley to make sure it spins easily (with the exception of the crankcase pulley). If any type of of the pulleys grind or withstand spinning, shot cleaning castle or replacing them.
Posted byThe DIYerat1:00 AM

Labels:Mechanic,Tune up


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Thanks - almost 11 year after you post this story, it's assisted me to deal with my car!

February 24, 2020 at 5:42 PM


Amazing... Thank you! i Burt increase 3 pulleys but this is it 26 ft lbs. Say thanks to you again. Say thanks to you rockauto because that cheap parts. I had the ability to buy actual Nissan pulley-block from them together the last pulley.