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Unread 12-27-2009, 06:41 PM   #1
Mean Max
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Basic Maintenance - 4.0L serpentine belt tension adjustment

Today we were getting a lot of Jeep work done, and one of the things on the list was adjusting the tension of the serpentine belt on my red '91 4.0L YJ.

The belt actually needs to be replaced, but until I get the new one I wanted to get the belt squeal under control.


Here is where I started, loosening the two 13MM bolts located at the rear of the power steering pump. I access these from the top, using a long 13MM boxed end wrench.
It is only necessary to loosen them about 1/2 to 1 turn.




Next loosen the 13MM pivot bolt located at the top of the power steering pump, just above the pulley.


Then loosen the nut located underneath the pulley that locks down the belt tension adjuster bolt. I used a 13MM shallow socket on a 1/4" drive ratchet.


Now you can loosen or tighten the belt tension using the belt tension adjuster bolt. Tightening the bolt will tighten the belt, loosening the bolt will loosen the belt. I used a 13MM shallow socket on a 1/4" drive ratchet for this as well.


The belt needs to be fairly snug to avoid squealing. It's really difficult to describe the tension requirement exactly, but tight is pretty descriptive. After tightening the belt to the desired tension, be sure to tighten all 4 of the mounting points.

Max

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Last edited by Mean Max; 01-01-2010 at 09:39 PM..
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Unread 12-27-2009, 07:32 PM   #2
DirtyJeepBoy
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Great write up as usual Max. I see me standing on the porch. Great picture of all our Jeeps.
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Unread 12-27-2009, 10:08 PM   #3
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Max, thanks - as usual its a great write-up. And yes, you beat me to the project so this will be helpful!
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Unread 12-28-2009, 04:46 AM   #4
idaholtby
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One thing I found helpful with the 4.0L is to remove the stock air box (if so equipped). This gives you a little more room to get after that tensioner adjustment bolt.
Keep up the good work Max!
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Unread 12-28-2009, 04:57 AM   #5
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Good write-up and pics Max. Thanks!
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Unread 12-28-2009, 06:23 AM   #6
coachholland
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Quick question. Is there anything special about that nut that goes on the tension adjuster bolt or can I just pick one up at the hardware store? Mine is gone and I'm tired of using belt dressing.
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Unread 12-28-2009, 12:23 PM   #7
Mean Max
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Quick question. Is there anything special about that nut that goes on the tension adjuster bolt or can I just pick one up at the hardware store? Mine is gone and I'm tired of using belt dressing.
Not special at all.

It's a 8MM thread X 1.50 pitch (I think) "flange nut" because there is a washer sized flange built in. But a regular nut & flat washer can be used.

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Unread 12-28-2009, 12:49 PM   #8
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Max
Max, I dislike you, and here's why: You mentioned today, December 27th... yadda yadda yadda. In the photo everyone has their bikini tops on or no top! While I'm up here in PA spending $25 in kerosene to keep my garage warm while I did some work to my YJ. And every 3rd day or so I'm at the carwash washing the underbelly of my Jeep to get the dreaded road salt off.

You suck.

Sincerely,
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Unread 12-28-2009, 02:33 PM   #9
Mean Max
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Max, I dislike you, and here's why: You mentioned today, December 27th... yadda yadda yadda. In the photo everyone has their bikini tops on or no top! While I'm up here in PA spending $25 in kerosene to keep my garage warm while I did some work to my YJ. And every 3rd day or so I'm at the carwash washing the underbelly of my Jeep to get the dreaded road salt off.

You suck.

Sincerely,
Axl Jack

What the hell?

You don't have to go & sugar-coat it! Tell me how ya really feel!

I know, I run with no doors & the bikini top pretty much year 'round!

I had been running with no top on my YJ from around February until I got the mesh VDP bikini top in June. It's been on there since then.

Here's when I got it.

http://www.jeepforum.com/forum/f176/...p-call-796196/

Max
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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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Unread 01-20-2010, 12:09 PM   #10
ZeroGravity
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Thanks for the write up Max! It seems like the little things can turn out to be the most difficult.

Even my Haynes manual was vague on the adjustment process for the Fuel Injected models, I probably would have rounded off the 13mm bolts thinking they were standard.
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Unread 01-20-2010, 05:16 PM   #11
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Quote:
Originally Posted by Axl Jack View Post
Max, I dislike you, and here's why: You mentioned today, December 27th... yadda yadda yadda. In the photo everyone has their bikini tops on or no top! While I'm up here in PA spending $25 in kerosene to keep my garage warm while I did some work to my YJ. And every 3rd day or so I'm at the carwash washing the underbelly of my Jeep to get the dreaded road salt off.

You suck.

Sincerely,
Axl Jack

Living is Florida really sucks. The damn sun never goes away.



Anyway Max I have a question. To adjust the belt on my HD I have a tension tool and I am suppose to put 10 lbs of pressure to the belt and adjust until I have, (If I remember right.) 1/2 to 3/4 inch of play on the belt.

Does the YJ have any specs as to what to adjust the belt to? I hate to adjust it too tight because I do not want to wreck bearing on alternators, pumps, and etc. Or stretch the belt due to ever tension. ???
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Unread 01-20-2010, 05:32 PM   #12
Mean Max
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Living is Florida really sucks. The damn sun never goes away.



Anyway Max I have a question. To adjust the belt on my HD I have a tension tool and I am suppose to put 10 lbs of pressure to the belt and adjust until I have, (If I remember right.) 1/2 to 3/4 inch of play on the belt.

Does the YJ have any specs as to what to adjust the belt to? I hate to adjust it too tight because I do not want to wreck bearing on alternators, pumps, and etc. Or stretch the belt due to ever tension. ???
Spec is 180-200 lbs. from what I have heard.

As soon as I get in the vicinity of my FSM I'll double check & make sure the correct spec is in this thread!

Here's a link to a belt deflection gauge, available through NAPA and other retailers.

HMC Int'l.; KRIKIT TENSION TESTERS

Max
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There is no situation that cannot be improved with a small but well-placed explosive.
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Unread 01-20-2010, 05:52 PM   #13
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Huh, How does this thing work? I50 lbs is allot of pressure to hold. I am sure that I am not understanding how this tool works.

Thanks Max.
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Unread 01-20-2010, 05:55 PM   #14
Mean Max
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Huh, How does this thing work? I50 lbs is allot of pressure to hold. I am sure that I am not understanding how this tool works.

Thanks Max.
The tool fits on either side of the belt. It measures the force that is required to deflect (bend) the belt. Once the tool is on the belt, you tighten the belt until the scale reads the desired deflection specification. No holding required.

Max
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Quote:
Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
Originally Posted by Benderff View Post
No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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Unread 07-29-2010, 09:25 PM   #15
91NDJeep
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Awesome post.

I spent hours trying to find the right bolts to adjust this damn thing. I knew it was the power steering bracketry that did it and got all of the bolts loose except the actual tensioner one underneath. Didnt even see it.

Thanks for clear pics and a great how-to.
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