AC vs Non-AC belt sizes

TORX · Apr 11, 2009

Is there a difference in belt sizes between a 4.0L with AC, and one without AC?

I'm adding an AC compressor to my XJ, and I'm wondering if I need to pick up a new belt. Judging by the difference in pully size my guess would be yes, but I wanted to check first.

5-90 · Apr 11, 2009

Usually, no. There is an "AC Delete" pully that is supposed to be the same size as the compressor pully, so you just swap the one for the other.

TORX · Apr 11, 2009

My XJ (88') doesn't have AC, so right now I have the so called "AC delete pulley."

However, when comparing pulley sizes the AC compressor has a larger pulley. I tried test fitting the compressor tonight and it bolted right up, but the belt seemed to be to short.

I'll call the local parts store tomorrow and see if they list two part #'s.

hanaxj87 · Apr 11, 2009

My guess the non-a/c belt will be shorter.

Nick

Saudade · Apr 11, 2009

TORX said:
My XJ (88') doesn't have AC, so right now I have the so called "AC delete pulley."

However, when comparing pulley sizes the AC compressor has a larger pulley. I tried test fitting the compressor tonight and it bolted right up, but the belt seemed to be to short.

I'll call the local parts store tomorrow and see if they list two part #'s.

Where did you find the delete pulley for an 88?

RCP Phx · Apr 11, 2009

This might help.
http://madxj.com/MADXJ/technical/technicalfiles/ARonBoardAirNoVBelt/OnBoardAirNoVBelt.htm

wishbone · Apr 12, 2009

Or if you
1. mount your compressor.
2.Find your, or your wifes, or whatever's tape measure for say a belt?
3.flexible tape measure around the pulleys adding pulley top to pully top and
4.Adding them up, you should be within an inch, which your
5.tension pulley will take the rest.
6.take that to NaPa and ask them for that length belt.
7.try to get the same number of grooves(mine have 7)
8.Buy that
9.install, adjust, and drive.

this took me prob an hour from start to finish, with a trip to above mentioned retailer.
Good luck

TORX · Apr 12, 2009

Saudade said:
Where did you find the delete pulley for an 88?

My XJ didn't come from the factory with AC. Where the AC compressor should be, there is just a bracket with an idler pulley. So to answer the question it's stock.

I also called around today, and only one size belt is available. I'll mount the compressor tomorrow and see if my belt will fit. I don't see why it wouldn't though.

5-90 · Apr 12, 2009

TORX said:
My XJ didn't come from the factory with AC. Where the AC compressor should be, there is just a bracket with an idler pulley. So to answer the question it's stock.

I also called around today, and only one size belt is available. I'll mount the compressor tomorrow and see if my belt will fit. I don't see why it wouldn't though.

It should. The AC delete pully was probably originally done by AMC to 1) simplifiy logistics and 2) simplify engineering (only have to stock one size belt, only have to work out one routing pattern.)

If you do end up doing this install, I'd like to see if I can talk you out of the idler pully & bracket.

AC vs Non-AC belt sizes

TORX

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5-90

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TORX

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hanaxj87

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Saudade

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RCP Phx

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wishbone

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TORX

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5-90

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