Drive Belt Tensioner Bolt - JeepForum.com
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post #1 of 15 Old 09-24-2019, 10:20 AM Thread Starter
mikewiz38
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Drive Belt Tensioner Bolt

A mystery of mine is tightening the serpentine belt on the YJ. I've seen videos and have the idea down, but I'm almost positive my YJ is missing that tensioner bolt. Mine does have an A/C compressor but does not have a tensioner pulley. On the power steering pump, I'm about 99% positive that there's just a straight bolt that runs through the bottom of it.

I've been looking for something online and haven't seen anything for a YJ. I've seen things for a TJ and up, but nothing for the YJ.

Does anybody have a suggestion on what to use to find a replacement bolt? Will the TJ part for a 4.0L fit on a YJ? Will Dorman 917-951 work for us?

Thanks!


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post #2 of 15 Old 09-24-2019, 10:31 AM
RockWoRM
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13mm bolt on bottom of the PS pump. PIA to get to but should be there.

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post #3 of 15 Old 09-24-2019, 12:48 PM Thread Starter
mikewiz38
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Quote:
Originally Posted by RockWoRM View Post
13mm bolt on bottom of the PS pump. PIA to get to but should be there.
Do YJ's have that belt tensioner bolt thingie like the TJ's do? There's the bolt that goes through the power steering pump and into a block of steel. Then there's a bolt that goes in from the side into that block to adjust the tension.

From what I can remember, I had to stretch the PS pump out by hand and tighten the bolts. I don't remember any sort of adjustment bolt on mine.

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post #4 of 15 Old 09-24-2019, 01:23 PM
Luuca
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To tighten the PS pump on a YJ, loosen the two 7/16" bolts behind the pump that hold it to the bracket. Loosen the top most 1/2" bolt. Loosen the 1/2" lower locking bolt on the adjusting bolt (on the lower front of the pump below the pump pulley. Tighten the adjusting bolt until you achieve optimal belt tightness. Tighten the locking bolt on the bottom front. Tighten the two bolts behind. VERY GENTLY tighten the top most bolt.

0900c1528008aeb0.jpg

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post #5 of 15 Old 09-24-2019, 02:46 PM Thread Starter
mikewiz38
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Quote:
Originally Posted by Luuca View Post
To tighten the PS pump on a YJ, loosen the two 7/16" bolts behind the pump that hold it to the bracket. Loosen the top most 1/2" bolt. Loosen the 1/2" lower locking bolt on the adjusting bolt (on the lower front of the pump below the pump pulley. Tighten the adjusting bolt until you achieve optimal belt tightness. Tighten the locking bolt on the bottom front. Tighten the two bolts behind. VERY GENTLY tighten the top most bolt.

Attachment 3860501
Thanks for the picture. I'm talking about that "drive belt adjusting bolt" and the "bolt collar" in your picture. If we don't have one, do you know an aftermarket one that may work? Will a TJ one work for our YJ? I can only find a TJ one.

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post #6 of 15 Old 09-24-2019, 02:57 PM
Luuca
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Quote:
Originally Posted by mikewiz38 View Post
Thanks for the picture. I'm talking about that "drive belt adjusting bolt" and the "bolt collar" in your picture. If we don't have one, do you know an aftermarket one that may work? Will a TJ one work for our YJ? I can only find a TJ one.
if you can take a pic or three of what you have, it would help determine what you need

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post #7 of 15 Old 09-24-2019, 03:40 PM
Awesome
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They are all 1/2" bolts on my YJ.

Using a ratcheting wrench is the easy way.

Mike, that collar is there to keep the adjustment bolt from vibrating loose. It's more of a failsafe than a necessary part.

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post #8 of 15 Old 09-24-2019, 07:05 PM Thread Starter
mikewiz38
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Quote:
Originally Posted by Luuca View Post
if you can take a pic or three of what you have, it would help determine what you need
No problem, I appreciate the help in trying to figure it out. It's a hard picture to take but it's the bottom bolt on the power steering pump. I had to use the phone upside down so it's kind of an upside down picture.

As you can see, there's no bolt going through that hole on the side. I have a nut and a some sort of a bolt coming out. Come to think of it, I wonder what happened because it's not looking what I was thinking. I thought there would be a bolt going in and a nut on the back or having it get bolted to the power steering pump. Whatever happened, it's not what I was expecting it to look like from the things I've seen.
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post #9 of 15 Old 09-24-2019, 08:52 PM
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Ahh. You have the collar, you're missing the tensioner bolt. It's a long all-thread bolt, so I'd imagine finding a replacement won't be easy.

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post #10 of 15 Old 09-25-2019, 06:36 AM
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https://www.ebay.com/itm/Jeep-Wrangl...-/281256543771

Here is the bolt you need.

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post #11 of 15 Old 09-25-2019, 08:56 AM Thread Starter
mikewiz38
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Thanks all for the information.

Is there a suitable one I could order from amazon prime instead? Or can I just go to the hardware store and pick up a long one? It looks like it *may* be a 5/16" fine thread bolt that's about 4" long. Is this correct?

Thank You!

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post #12 of 15 Old 09-25-2019, 09:12 AM
letitloose06
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Quote:
Originally Posted by mikewiz38 View Post
Thanks all for the information.

Is there a suitable one I could order from amazon prime instead? Or can I just go to the hardware store and pick up a long one? It looks like it *may* be a 5/16" fine thread bolt that's about 4" long. Is this correct?

Thank You!
The factory P/N 34202480 has been discontinued, so unless you can find a NOS one like the e-bay one, your best bet to get one quickly would be at a local junkyard. Any Jeep with a 4.0 or 2.5 from 91-95 will have this bolt.

I doubt you'll find a fully threaded fine thread bolt that long at a hardware store unless you go to a McMaster-Carr or Fastenal.

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post #13 of 15 Old 09-25-2019, 09:28 AM
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Also, looking at the Ebay listing photos of the bolt, it appears to have metric bolt class markings (Class 9.8), so it may be an M8x1.25 metric bolt. If you're going to try the hardware store route, I suggest bringing the adjusting bolt collar with you.
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post #14 of 15 Old 10-12-2020, 09:06 PM
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I just had to find one of these puppies, and it's not easy. I did buy one from Chrysler and they won't likely be carrying these bolts much longer. The one I received was M8-1.25 x 97mm, and had a gold colored anti-corrosion coating to it (I'd just get stainless steel and call it a day). Hope this helps!
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post #15 of 15 Old 10-16-2020, 10:19 AM
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Stainless will be more likely to break if it sticks in the threads than the cadmium/zinc plated steel would be.

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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