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Unread 11-14-2009, 04:06 PM   #1
jeepguy85
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1987 YJ Wrangler 
 
Join Date: Jan 2009
Location: Kingsport, Tennessee
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87 YJ serpentine belt 258 WITHOUT AC

Anyone have the Dayco part number for a serpentine belt for a 258 without AC? I am pulling the AC out of my Jeep and the parts guys at Adv Auto don't show a belt for 258 without AC? Everything they show for the 87 is with AC. So I am hoping to get the part number to be able to buy the belt I need. Thanks in advance!

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Unread 11-14-2009, 04:21 PM   #2
timatoe
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1st) They're stupid. The Goodyear Gatorback belt # is 4060817 they should be able to cross reference that. While we find your parts, please enter your ZIP Code at CSK Auto You just need an 81" belt, but it won't work without.......

2nd) Do you have one of these???



You're going to need an idler.
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Unread 11-14-2009, 04:30 PM   #3
jeepguy85
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Quote:
Originally Posted by timatoe View Post
1st) They're stupid. The Goodyear Gatorback belt # is 4060817 they should be able to cross reference that. While we find your parts, please enter your ZIP Code at CSK Auto You just need an 81" belt, but it won't work without.......

2nd) Do you have one of these???



You're going to need an idler.
No I do not have an idler. Where could I pick up one of those?
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Unread 11-14-2009, 04:30 PM   #4
dodger889
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Take a piece of rope run it around all you pulleys and measure it for your self. If I remember correct the belt is a 6 rib belt. Once you have your measurement say that it's 79" take that and subtract about an 1/2 to and inch off. which will be 780 = 78" or 785 = 78 1/2". then ask for the belt by measurement.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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im just cheap, and cheap makes you creative.
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Unread 11-14-2009, 04:39 PM   #5
jeepguy85
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Quote:
Originally Posted by dodger889 View Post
Take a piece of rope run it around all you pulleys and measure it for your self. If I remember correct the belt is a 6 rib belt. Once you have your measurement say that it's 79" take that and subtract about an 1/2 to and inch off. which will be 780 = 78" or 785 = 78 1/2". then ask for the belt by measurement.
OK, but where can I pick up one of the idlers at?
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Unread 11-14-2009, 04:56 PM   #6
jeepguy85
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dodger,
Are you saying to simply use a shorter belt and bypass the AC pulley completely or use an AC eliminator pulley?
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Unread 11-14-2009, 05:07 PM   #7
dodger889
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bypass the A/C idler it's not in the equation.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 11-14-2009, 05:10 PM   #8
jeepguy85
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Originally Posted by dodger889 View Post
bypass the A/C idler it's not in the equation.
Any gotchas associated with completely bypassing the ac idler and using a shorter belt?
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Unread 11-14-2009, 06:47 PM   #9
timatoe
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I have serious doubts that you'll be able to get the belt tight enough without the idler there. That's a long straight stretch with really no where to tighten it from, I mean the alternator basically moves up and down to tighten not side to side. Look at the pic I posted again.

I know that J&W Jeeps will have that bracket and the idler, but I'd check with a local salvage first.
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Unread 11-14-2009, 07:14 PM   #10
dodger889
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Quote:
Originally Posted by timatoe View Post
I have serious doubts that you'll be able to get the belt tight enough without the idler there. That's a long straight stretch with really no where to tighten it from, I mean the alternator basically moves up and down to tighten not side to side. Look at the pic I posted again.

I know that J&W Jeeps will have that bracket and the idler, but I'd check with a local salvage first.
Does it not swing from the engine out? or maybe a better way of saying this that the adjustment is on the bottom of Alt. , pivoting from the top mounting point? If so then you will be fine with the idler pulley.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 11-14-2009, 07:53 PM   #11
timatoe
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Quote:
Originally Posted by dodger889 View Post
Does it not swing from the engine out? or maybe a better way of saying this that the adjustment is on the bottom of Alt. , pivoting from the top mounting point? If so then you will be fine with the idler pulley.
Well sorta.... I does technically move side to side in the slider portion, but because of wehre the pivot is, it causes the alternator to basically move up and down. The actual pivot point is the hole below the square hole (red arrow)




Here's another pic from the top without the idler. You can see where one of the adjustment sliders are.



Here's some of the brackets just sitting on the floor in their loose orientation, you can see the pivot point better here.




FWIW, when I did my OBA I got rid of the way it pivots in stock form moving the pivot point to the upper left area of the alt looking from the front making it swing more side to side with the slider at the bottom.
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Quote:
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
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Unread 11-14-2009, 08:09 PM   #12
dodger889
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So it does pivot away from the engine as not as great that some do. So if the OP takes a measurement with it as close to the engine on the top then they will have enough movement to tighten up a belt then. That is one of the nice things about serpentine belts they do not stretch that much.
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 11-14-2009, 11:22 PM   #13
jeepguy85
Bringing down the BFH
1987 YJ Wrangler 
 
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Location: Kingsport, Tennessee
Posts: 1,076
Quote:
Originally Posted by timatoe View Post
I have serious doubts that you'll be able to get the belt tight enough without the idler there. That's a long straight stretch with really no where to tighten it from, I mean the alternator basically moves up and down to tighten not side to side. Look at the pic I posted again.

I know that J&W Jeeps will have that bracket and the idler, but I'd check with a local salvage first.
JW rocks! I bought alot of stuff from them for my CJ7, guess it is time to find the email addy for em in address book!
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Unread 09-08-2010, 08:40 PM   #14
rdrjunkie1
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Does anyone here have a diagram for the pictured serpentine belt? I just replaced my water pump and am afraid that I may have routed something wrong. I took it out for a quick 2-3 minute drive probably ran it for about 8 minutes total and by the time I hit the house again it was already above 210 if not 220 and I don't remember that temp being normal for that short a period.
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Unread 11-06-2012, 07:35 AM   #15
erekv2
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Sorry for reviving this old thread but does anyone have any information on where I may be able to find this setup pully/with the base bracket, I am in need to this setup as my lower bracket is broken? Any Ideas are welcome.
screen-shot-2012-11-06-9.32.19-am.jpg  
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