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AC Idler Pulley/Tensioner Pulley Recon


Rosssub

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I pulled into the servo last night to hear my AC tensioner pulley bearing screaming. I cut the belt and carried on. Today I've replaced the pulley bearing and reinstalled it.

 

Here's the AC idler or tensioner:

AC_bearing_Knock_Sensor_010_Copy_2.jpg

 

To adjust the belt loosen the 12mm locking nut, then wind the adjusting bolt in (tighten) or out. I've removed the 2x12mm mounting bolts so the tensioner bracket can be removed:

AC_tensioner_bearing_change_002.jpg

 

Disassembled:

AC_tensioner_bearing_change_003.jpg

 

I've used a 21mm socket and hammer to knock the old bearing out of the pulley:

AC_tensioner_bearing_change_004.jpg

 

Squealing bearing removed, I then went to my local engineering shop and brought a replacement bearing for $5.80. The bearing size is 40mm O/D x 17mm I/D x 12mm:

AC_bearing_Knock_Sensor_001.jpg

 

I've used a 1-3/16" socket and hammer to press the new bearing into the pulley. Anything that fits the bearing's outer race neatly will do fine:

AC_bearing_Knock_Sensor_006.jpg

 

Reconditioned AC tensioner back together:

AC_bearing_Knock_Sensor_007.jpg

 

Then reinstalled. Now I just need to buy a new AC rib belt and throw it on. I'm using Dayco P/N 4PK0890, (4 rib belt 890mm long).

AC_bearing_Knock_Sensor_012.jpg

 

An old pic showing both belt part numbers. Both 5-10mm longer than OEM length, still a perfect fit but a lot easier to get on and off when needed:

5PK0880 (5 rib belt 880mm long) - Alternator/PS belt

4PK0890 (4 rib belt 890mm long) - AC belt

Dayco_belt_change_002.jpg

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