88 MJ belt alignment

RynoMJ · Dec 26, 2016

I had replaced my power steering pump a few weeks ago but never really ran it. The belt was squeaking and slipping off at the water pump. I noticed the harmonic balancer was starting to deteriorate and figured this would cure all the problems.

Squeak is gone but the belt is still slipping off at the water pump. Ive narrowed it down to the only other obvious thing which would be the power steering pump, but the pulley appears to be on all the way (flush with the shaft) but there does look like a gap behind it. Pump is a PSC (for hydro Assist)

Any thoughts?

Jeep Driver · Dec 27, 2016

Did you replace the HB?

If not, replace it.

RynoMJ · Dec 27, 2016

HB was replaced. The squeak is gone but the belt is still not aligned.

RynoMJ · Dec 27, 2016

Guess I'll try pressing the pulley on further, only thing I can think of.

90xj06 · Dec 28, 2016

It's hard to tell from the photo but it looks like the PS pump is slightly crooked.

RynoMJ · Dec 28, 2016

Gonna pop it off and reinstall maybe I missed something.

Jeep Driver · Dec 28, 2016

Is that the original pulley on the PS pump?

RynoMJ · Dec 28, 2016

No its a new pulley. Figured id get a new one since i was replacing the pump

Jeep Driver · Dec 28, 2016

RynoMJ said:
No its a new pulley. Figured id get a new one since i was replacing the pump

Are the two pulleys EXACTLY the same?

ParadiseXJ · Dec 28, 2016

A year or so ago I replaced th P/S pumps on both my Jeeps. One 1990 4.0L XJ and one 1988 4.0L MJ. Same pump for both, same hoses. I reused both pulleys. Both were slightly different (one spoked, one solid).
They were the same exact diameter and width.

BUT, the XJ pulley mounted flush with the end of the spindle, the MJ pulley mounted about 1/4" inboard of the tip of the spindle...aka...they were that way when I pulled them off, and I mounted them just like they were when I pulled them off.

Depending on which direction they're slipping off, I'd adjust it there.

RynoMJ · Dec 28, 2016

ParadiseXJ said:
A year or so ago I replaced th P/S pumps on both my Jeeps. One 1990 4.0L XJ and one 1988 4.0L MJ. Same pump for both, same hoses. I reused both pulleys. Both were slightly different (one spoked, one solid).
They were the same exact diameter and width.

BUT, the XJ pulley mounted flush with the end of the spindle, the MJ pulley mounted about 1/4" inboard of the tip of the spindle...aka...they were that way when I pulled them off, and I mounted them just like they were when I pulled them off.

Depending on which direction they're slipping off, I'd adjust it there.

This would make perfect sense then! Thank you for the info I'll give it a shot this weekend!

88 MJ belt alignment

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