My XJ is a 95/4.0/5-speed, but it's got the motor from a 97, so I'm never quite sure which parts are from what!

My AC compressor bracket only has two of the four bolts holding it on, and I'm getting a suspicious belt squeak when it's cold even though the belt tension is reading 160, so wondering if only having 2/4 is allowing some flex. I looked on here and someone said they were M8-1.25 x 100 flange bolts, so I ordered some - too small. Someone else said theirs was M10-1.50 x 90mm, so I ordered some of those - too big.

SO, I got out the calipers - the holes appear to be .37 inches, while the shaft of the m8 bolts are .31 and the m10s are .385.

Maybe I've got some weird thing that needs M9 bolts??

Would be most grateful for any help!

 

see if one of the other two bolts will fit, if so, take that bolt to the store and match it.

beware, some stuff on our jeeps in SAE, other is that funky metric stuff!

 

Yeah, I've been avoiding taking one out because with only two left on there I'd have to completely loosen the belt! Looks like we might about be there though :/

 

With belt removed, besure to check the idler pulley, spin by hand, listen for noise, spin and feel for rough spots, grab the circumferance and try to wiggle it, there should be near zero free play. if it fails any of these tests, might as well replace it now. Had one fail on me, it actually was spitting sparks as the ball bearing ground itself.
many are it seems made with low quality bearings, just dont seem to last long. Many are made of chineseium. I now carry a spare.

 

the engine block is not metric.

.37 is real close to .375 which is 3/8"

 

You are talking about the bolts that bolt the bracket to the block...not the compressor to the bracket....correct? They are 3/8 coarse thread. I don't remember the exact length . Get 2 each and washers in 1. 1 1/4 and 1 1/2 the 1 1/4 rings a bell

 

I'll definitely check that idler pulley today - thanks.

Sorry, I might be calling this the wrong thing! They are the four long bolts that go down through the top of the compressor bracket into the block - they're probably 4 inches long or so. One of them is broken off, and I'm weighing just running 3 vs. having to helicoil that one out of there.....

Cruiser, you're going to laugh at me - I was trying to figure out what the size might be, and did the math on 5/16, 7/16, even 9 and 11/32nds, and TOTALLY skipped 3/8 - might well be!!!

 

Often when the bolt breaks, you will find that the internal threads, after removal of broke bolt, are just fine, no Helicoil needed.

Give it a go at broken bolt removal. Id be leary of running it with a bolt missing.


Good luck

 

Well I was COMPLETELY wrong - that's what I get for typing a post just off my memory from a few days ago! The bolts I'm talking about go down through the compressor - looks like into a bracket that then goes onto the block. Here's two of them:



I also checked the idler pulley and it seems to have zero play, so guess that's one thing to rule out...

 

Bolt circled in red is metric. Markings on bolt indicate that. 9.8 grade metric.

See link for bolt markings, SAE verses Metric...

https://precor.mcoutput.com/114581/Content/SourceTopics/General%20Information.htm

 

The parts catalog agrees with the M8x1.25 by 100mm long you posted.

 

Thanks for all the great help - ended up with bigger fires to put out!! Including a HP44 swap that had plenty of problems. Finally got back around to this when I replaced my belt today and thought why not, this is as good a time as any to look at this problem!

The two bolts that were "still in" (one was just resting in the hole and the other was actually threaded in) were indeed M8 x 1.25. These bolts would thread into the two rear holes but strip out towards the bottom and spin. When I put these bolts into the front holes, they fall straight to the bottom - no thread engagement whatsoever.

So seems like the bracket is stripped out - maybe when the PO did the motor swap he put these in with an impact or something ridiculous like that. Maybe the best bet is to just replace the bracket that these thread into? I assume it's called the AC compressor bracket - think this is the right one? https://deadjeep.com/products/copy-o...l-transmission That claims to be OEM part number(s)53010261, 53010023, and 53006550 - I've only seen part #53011002 mentioned here before.

Again mine is a 95 (AX15) with a motor from a 97. Thanks again a ton for all your help!

 

If the lower casting is stripped, can you get a longer bolt that goes all the way through and just put a locknut on it. A lot easier than replacing the casting and it would be just as strong

 

Well that is an absolutely fantastic idea!!! Just saved me a bunch of money and aggravation. So I just discovered that I can't go straight through the hole to the front right - there's something about an inch from the bottom. I figure it might be a broken off bolt or maybe even the bottom of the casting? I've been really super lucky and never had to deal with broken bolts - any advice on the best way to deal with that?
Thanks again a whole lot!

 

The casting is alluminum...if its not a thru threaded hole you could drill through it easy and make it a thru hole. Shine a flashlight down that hole in the dark, see if light passes...if so...drill. I have a bracket somewhere in the attic...I will dig it out and see what it looks like. May take me a day or so to get up there. Stick your phone underneath if possible and take a picture. If a broken bolt, doubtful, grade 9.8 metric is pretty strong...stronger than the alluminum threads but if so you will probably have to remove bracket to remove it but 1step at a time