Serpentine belt routing - JeepForum.com

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post #1 of 26 Old 01-11-2008, 02:14 AM Thread Starter
Flash2004
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Serpentine belt routing

Just changed my water pump (4.0 1998 export build with aircon) and went to reinstall the belt. I put it back on the same way it came off but i don't think its right.

I've checked my FSM but the diagram they have there won't work on my engine arrangement. The FSM diagram shows the belt coming from the crankshaft around the top of the water pump and over to the alternator, up to the A/C, under the idler, over to the PS pump, to the adjusting idler then back to the crank. My fixed idler pulley is set too low to allow the two parts of the belt to run under it. they will rub together at that point.

There's no sketch under the hood anywhere either. The original way i found it had the belt running under the water pump pulley but it has never looked right and may be th reason my engine has always run on the hotter side - bubbling into the overflow tank whenever I stop the engine. It also slips crazily whenver I get into water.

Anyone have a schematic they can post which might be the right one for my engine please? I can't cut and paste from my FSM because its copy protected!

Any help would be really appreciated, cheers, Gordon



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post #2 of 26 Old 01-11-2008, 02:43 AM
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http://www.stu-offroad.com/engine/belt/belt-1.htm

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post #3 of 26 Old 01-11-2008, 03:47 PM Thread Starter
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Quote:
Originally Posted by Waldn
That is exactly what my FSM shows as well, but it can't work. have tried to upload that diagram so readers acn see, but the two parts of the belt will not fit between the idler and water pump pully without touching. This is a real mystery?
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belt-2.jpg  


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Last edited by Flash2004; 01-11-2008 at 04:20 PM. Reason: Wrong diagram uploaded
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post #4 of 26 Old 01-11-2008, 05:26 PM
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Is it possible to post a picture of your engine so people can see the differences?

97 TJ SE 2.5L Auto, 3" BDS, 255/85-16 BFG MT KM
04 KJ LTD Frankenlifted, Full Mopar Armor, front reciever hitch for winch, Rubicon Moabs and MTRs
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post #5 of 26 Old 01-11-2008, 06:25 PM Thread Starter
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My engine

See if you can see what I mean from this photo - a bit difficult now that radiator etc. is no back in sorry.
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belts 003.jpg  


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post #6 of 26 Old 01-11-2008, 06:26 PM Thread Starter
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Sorry for the big photo size


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post #7 of 26 Old 01-11-2008, 06:52 PM
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It appears that your alt is too high... I went out and looked at mine and the pattern in the same, but my alt looks lower...
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post #8 of 26 Old 01-11-2008, 07:02 PM Thread Starter
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It all looks stock and I can see no way to move either the alternator lower or the idler higher. They're all in fixed positions? I'm going out to put it back where I found it, and get another photo with it installed. I'll also check the rotation direction of the fan and water pump. thanks


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post #9 of 26 Old 01-11-2008, 07:48 PM
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Upon closer inspection and with your picture in hand, your AC mounting bracket is very different than mine... Differences between 97 and 99? I'm not sure... My Alt is farther outboard and lower than where yours is... Do you have the exact year FSM?
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post #10 of 26 Old 01-11-2008, 08:21 PM
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That is strange - I wonder if that is the correct alternator/bracket. I guess they changed the tensioner after 2000 - mine is a lot different.

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post #11 of 26 Old 01-11-2008, 08:31 PM
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Yes... The 2000 and newer are very different... The newer TJ's use a spring loaded IDL pully... My 06 Unlimited looks very similar to the 2000
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post #12 of 26 Old 01-11-2008, 08:32 PM Thread Starter
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I guess my problem is I don't know the exact year. They date them by the year sold here and it might have been in stock for a year or two before it sold. Here's the VIN if anyone can date it? 1J4FY49S 5WP743603


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post #13 of 26 Old 01-11-2008, 08:39 PM
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The W in the code says it's a 98... Do you know if the AC was stock or an added option?
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post #14 of 26 Old 01-11-2008, 08:40 PM
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Quote:
Originally Posted by Spacecom
Yes... The 2000 and newer are very different... The newer TJ's use a spring loaded IDL pully... My 06 Unlimited looks very similar to the 2000
Interesting. The spring loaded pully makes it easy to remove/install the belt. Maybe someone can check that VIN number for you - I think there is a way to get the year from it but I am not sure.

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post #15 of 26 Old 01-11-2008, 08:41 PM
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According to http://jeep.avtograd.ru/VIN/vin_en.asp it's a 1998 model.
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