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Old 07-25-2014, 02:40 PM   #1
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Humbled by my stupidity... Again!

This one is just embarrassing... but I need help to figure this out the right way so I don't do damage. Im changing the serpentine belt for the first time on my 2000 TJ (not my first time, just on this jeep), 4.0 with AC. I took my old belt off and went to put the new Mopar belt on and it didn't fit. I went to a different store (assuming) the mopar belt was the wrong one a bought another belt. Same size and same results. Returned the second belt and went to put the "OLD/original" belt on and now that doesn't fit??? I'm using the proper diagram, the proper belt and on the 2000 TJ, 4.0 w/ac it has a tension arm so no adjuster.. What the heck is going on? Just a little back story.. jeep was running fine just starting to squeal with higher rpm.. old belt came off easy, did it myself.. Now not even the loose one will fit back on.. about a half inch to short??? I know how the tension arm works and Im using the proper tool to take the tension arm to full relax position. Nothing is obstructing the belt on any part of the pulleys or in between. BTW - I checked all pulleys for noise or movement (in directions it should move) and all else is fine.

Can someone help me please?

Jeff B.

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Old 07-25-2014, 02:50 PM   #2
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Re check your belt routing. It's easy to get it wrong.

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Old 07-25-2014, 03:39 PM   #3
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Here's the diagram for a 2000 4.0L just in case you might have the wrong one.
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Old 07-25-2014, 04:04 PM   #4
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Thank you, but I triple checked it just in case my diagram was wrong.. I have it on there right now exactly the way yours and mine both show. The only thing I have thought of (and haven't tried) is forcing it.. however, that wouldn't explain why it came off so easily. I pulled it off with two fingers, because my other hand was on the breaking bar (which was releasing the tension from the tension arm).
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Old 07-25-2014, 05:40 PM   #5
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Number 7 the tensioner has to be swung a lot further clockwise (out) on its arm pivot to make the belt fit properly then the spring swings it counter clockwise up an into the side of the belt to tension it

I'll post some pics
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Old 07-25-2014, 05:43 PM   #6
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See pics
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Old 07-25-2014, 06:16 PM   #7
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Quote:
Originally Posted by Digger84 View Post
Number 7 the tensioner has to be swung a lot further clockwise (out) on its arm pivot to make the belt fit properly then the spring swings it counter clockwise up an into the side of the belt to tension it

I'll post some pics
roger that.. its fully extended in the pic because my hands are obviously holding the camera to take the pic.
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Old 07-25-2014, 06:21 PM   #8
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On that underhood sticker the dashed line is if you don't have ac
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Old 07-26-2014, 12:17 PM   #9
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***Don't Do It***

Quote:
Originally Posted by Water Dog View Post
Here's the diagram for a 2000 4.0L just in case you might have the wrong one.
FYI All - Don't do it! This is the wrong diagram.. Not throwing stones.. two people on here had the same one as did my step father, that brought it home from his dealership, same as I. IT IS THE WRONG SETUP. As you can see I have the ac unit and now have the belt on in PERFECT working order.. I did not have to force it, it went on with releasing the tension and two fingers. I'm adding the pics for all you dis-believers.

The published diagram is incorrect.

My sweat and tears is better then aspirin.
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Old 07-26-2014, 11:27 PM   #10
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Quote:
Originally Posted by FLEX B View Post
FYI All - Don't do it! This is the wrong diagram.. Not throwing stones.. two people on here had the same one as did my step father, that brought it home from his dealership, same as I. IT IS THE WRONG SETUP. As you can see I have the ac unit and now have the belt on in PERFECT working order.. I did not have to force it, it went on with releasing the tension and two fingers. I'm adding the pics for all you dis-believers.

The published diagram is incorrect.

My sweat and tears is better then aspirin.
My 05 with A/C has the belt installed as per the factory diagram posted in this thread. While your belt routing may work, I'd be worried about the minimal contact it makes with the crank pulley and wouldn't be surprised if the belt ended up slipping.
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Old 07-27-2014, 07:39 AM   #11
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Quote:
Originally Posted by Vinman View Post
My 05 with A/C has the belt installed as per the factory diagram posted in this thread. While your belt routing may work, I'd be worried about the minimal contact it makes with the crank pulley and wouldn't be surprised if the belt ended up slipping.
agreed, and the limited pics make it hard to tell how its set up
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Old 07-27-2014, 04:40 PM   #12
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X2 Vinman, I'm thinking that you did not have all the slack pulled out of the belt your first attempts to install it according to factory diagram. With all those sharp turns it has to make round the pulleys, it may have had slack between pulleys.
I also agree that the minimum contact it is making with the Crankshaft pulley, could result in slippage and there by reduced steering capability. or reduced alternator output.
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Old 07-29-2014, 01:24 PM   #13
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Quote:
Originally Posted by Vinman View Post
My 05 with A/C has the belt installed as per the factory diagram posted in this thread. While your belt routing may work, I'd be worried about the minimal contact it makes with the crank pulley and wouldn't be surprised if the belt ended up slipping.
Is it possible that the 05 (which I know has differences) is set up differently? I'm not afraid to admit when I'm wrong (look at the thread title), but I need to see apples to apples for comparison to understand. "did not have all the slack pulled out of the belt" is not an option. Tried it multiple times with multiple belts and had a second person underneath the jeep to make sure the belt was tracking correctly (just in case). The only thing I haven't checked (that I can think of) is maybe a pulley was changed with the wrong size, but everything seems in order.. Everything seems to be working in order and I've made a 1600 mile trip to the mid-west in the last 2.5 days. Well I still need to do those dang synchros, but that's another thread.
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Old 07-29-2014, 02:15 PM   #14
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You can also check the indicators on the tensioner.
This is from the 2004 FSM, not sure if it applies for earlier or later years:
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Old 07-29-2014, 03:27 PM   #15
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Quote:
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You can also check the indicators on the tensioner.
This is from the 2004 FSM, not sure if it applies for earlier or later years:
Same shows up in the 2005 FSM.
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Old 07-29-2014, 03:39 PM   #16
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the only vehicles that change less than jeeps are harleys. the belt routing pic for a 2000 4.0L is in the 3rd post and is the same through 2006.
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Old 08-01-2014, 02:18 PM   #17
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