The list of which 4.0L Jeep motor will fit your Jeep

[Reid]

Update:

Thread length was right balancer slipped on the plastic/bakalite? What ever liner and cause the outer ring to stick out too far.

New harmonic balancer resolved the issue.

 

[shawn]

And belt tightness. I’ve read these things need to be really tight. Is there a too tight?

IME, I'll tension it, think it's super tight, find out the alternator pulley slips, then tighten it more.

 

[StretchASU]

IME, I'll tension it, think it's super tight, find out the alternator pulley slips, then tighten it more.

And on any of these that have a tensioner to set the belt and not just cranking on whatever accessory sets the adjustment, replace the tensioner when you replace the belt. When one needs replacing, the other usually follows in short order.