It looks like there is a long mounting bolt for the lower pulley also goes through the pulley bearing, thru the flange of the timing cover, through the lower arm of the AC mounting bracket and is then nutted at the end of that bolt. In other works the bolt is not bottom threaded into a flange or bracket like the upper pulley. Am I correct in my assumption? If so, what is the easiest way to remove that bolt as my Chilton doesn't address this task. If the bolt and nut combo is the fastening device, once I get the nut off (easier said than done), will the bolt slide out easily (along with pulley) or can I count on the bolt being bound up by offset alignment pressure from the AC bracket and the timing cover flange holes? Not much room to work from the back or underside of the alternator to push the bolt forward and I am dreading the though of having to remove alternator and AC (not disconnecting hoses):banghead:.Did you ever resolve this?
I've had similar intermittent squealing from my '94 YJ with A/C (4.0 6 cyl). I have replaced the water pump (due to leak), serpentine belt, and upper idler pulley. Using a mech's stethoscope it sounded like the upper idler pulley, but that didn't change anything. Squeal is intermittent, seems that cold weather is one factor (doesn't squeal when it's warm), and when it is squealing A/C on or off makes no difference.
When none of that did the trick, I went for the lower idler pulley. Wouldn't come out. It FELT like there was a spinning nut behind it, but I saw the bolt go into the timing cover and assumed, like the upper pulley, it was tapped in and I guess didn't look far enough back to find any nut. I concluded that I had stripped the threads on the bolt and would need to at least replace the timing cover, which did not make my day. As a short-term fix (and diagnostic aid) I put on an A/C-less belt, bypassing both idlers and the A/C compressor.
This is great news that there is a nut back there somewhere....
David
I've had similar intermittent squealing from my '94 YJ with A/C (4.0 6 cyl). I have replaced the water pump (due to leak), serpentine belt, and upper idler pulley. Using a mech's stethoscope it sounded like the upper idler pulley, but that didn't change anything. Squeal is intermittent, seems that cold weather is one factor (doesn't squeal when it's warm), and when it is squealing A/C on or off makes no difference.
When none of that did the trick, I went for the lower idler pulley. Wouldn't come out. It FELT like there was a spinning nut behind it, but I saw the bolt go into the timing cover and assumed, like the upper pulley, it was tapped in and I guess didn't look far enough back to find any nut. I concluded that I had stripped the threads on the bolt and would need to at least replace the timing cover, which did not make my day. As a short-term fix (and diagnostic aid) I put on an A/C-less belt, bypassing both idlers and the A/C compressor.
This is great news that there is a nut back there somewhere....
David
