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Old 05-07-2015, 10:14 AM
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Help!!!!

Ok, here is the deal. I have a 97 TJ Sport, 4.0L/Auto with about 104K on it. I have done a little work on it, but nothing to the engine, transmission and transfer case except to service it. The oil, transmission fluid and transfer case fluid are all clean and clear.

Last summer I went wheeling an hour and a half from home. Everything was going great and then at the top of a hill, it started, clanking (for lack of a better word) real loud. From a little ways away, a few guys said it sounded like lifters. I kind of thought so too, but after a little investigating it sounded like it came from behind the engine not in the engine. I decided to drive it home, so I put it into 2 wheel drive and headed home. After a little while, it stopped. Never to be heard of again.

Well yesterday, it was a little warm here in Indiana (about 83 or so) and a buddy of mine and I decided to take a 40 minute trip to go see a house I might buy. She drove fine and had all the power and was driving at 70MPH or so and then when we got to the town and slowed down to a stop and took off again, there was that clanking or clicking again.

My temp gauge was fine, but I noticed that when at idle no sound, but the oil gauge would drop really low. Then I would take off and the clank or click would start. I would let off the gas and then hit it and get the RPMs up and no clank or click. It would not happen every time I would take off and after a while no sound at all.

I checked the oil level and transmission fluid levels. All are fine and fluids, like I said are clear and clean. I do not understand why the oil pressure gauge would drop so low at idle, even when the engine was as warm as it was.

I do not believe it is the rods knocking, but yesterday I was not so sure. I think it might be the transfer case, but I was not in 4 wheel drive. It might be the transmission, but it seemed to shift fine. I am at a loss, and wanted to get some of your thoughts before I start tearing into stuff.

Thanks in advance for your help!!!!

DAWG

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Old 05-07-2015, 10:41 AM   #2
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Just for reference, normal oil pressure at idle is roughly 13psi and around 40-50psi when cruising. I would check for possibly the exhaust hitting something along it's path. Maybe when the rpms smooth out that it stops the exhaust from rattling.

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Old 05-07-2015, 12:18 PM
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Just for reference, normal oil pressure at idle is roughly 13psi and around 40-50psi when cruising. I would check for possibly the exhaust hitting something along it's path. Maybe when the rpms smooth out that it stops the exhaust from rattling.
Thanks for the reference on the oil pressure. I really don't think it is the engine at all. I also don't think it is exhaust as the sound is just to strong, but I will check.

I really think it is the transmission or transfer case. It can't be the chain for the transfer case though as it was in 2WD yesterday. I am wondering what in the transmission could make that sound, but it sure seems to come from it.
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Old 05-07-2015, 12:26 PM   #4
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U joints good?
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Old 05-07-2015, 12:29 PM   #5
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Can you take a video of it happening and post it? Maybe hearing it will help someone recognize it easier.

Have you checked the ujoints?
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Old 05-07-2015, 01:20 PM
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U joints good?
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Originally Posted by njs552 View Post
Can you take a video of it happening and post it? Maybe hearing it will help someone recognize it easier.

Have you checked the ujoints?
I have replaced drivers side axle u-joint and will be replacing the passenger side soon. and after that the drive shaft u-joints, but I have to tell you, I do not think those are it. I might be wrong as they do need replaced very soon.

As far as recording it, I will try to do that. I do not own a cell phone, but the better half does. I will have to get it to make the sound again though, as it is not constant and I think I will have to run it hard to make it happen again I think. I will try here sometime tonight.

Anyone know of anything in the transmission or transfer case that can make these kind of sounds?
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Old 05-07-2015, 02:28 PM   #7
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Dawg,

The chain does rotate in 2WD because the front drive shaft turns it.

If it was a 'growl' coming from the T-case, I'd say check the T-case input shaft bearing.

The only 'clanking' underneath I've experienced was when the exhaust hanger rusted off the pipe and the tailpipe was wandering around on the bumps striking things randomly. In that case, the 'clank' only happened on hard jounces on the trail or, strangely, on city street turns. The rest of the time, I wouldn't have known that there was anything wrong, even on the trail.

Sorry I couldn't help you more.

Happy Trails,
Bob
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Old 05-07-2015, 03:14 PM
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Dawg,

The chain does rotate in 2WD because the front drive shaft turns it.

If it was a 'growl' coming from the T-case, I'd say check the T-case input shaft bearing.

The only 'clanking' underneath I've experienced was when the exhaust hanger rusted off the pipe and the tailpipe was wandering around on the bumps striking things randomly. In that case, the 'clank' only happened on hard jounces on the trail or, strangely, on city street turns. The rest of the time, I wouldn't have known that there was anything wrong, even on the trail.

Sorry I couldn't help you more.

Happy Trails,
Bob
Thanks Bob. Are you a Vietnam vet? If so, thanks for your service too!!!
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Old 05-07-2015, 04:46 PM   #9
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Thanks Bob. Are you a Vietnam vet? If so, thanks for your service too!!!
Well, thank you! Yup, just drove around in my 717' inboard blowing things up. Well, me and 1200 of my best friends...the Navy is a team sport you know.

Happy Trails,
Bob
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Old 05-07-2015, 04:49 PM   #10
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Old 05-07-2015, 05:05 PM   #11
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So I had a 95 YJ with a 2.5 4cyl, I know I know, different beast all together. However, they are similar in design to a 4.0 6cyl. I took a trip about 70 miles or so from my house in my YJ, all high-way, and when I got to where I needed to be, I noticed the oil pressure would drop real low and then go back up, then drop, so on and so forth. Well I parked and enjoyed a nice home cooked meal and maybe three or four hours later I went and started up the Jeep and noticed this strange ticking noise, I popped the hood, couldn't see anything, so I just took it easy on the way home. I took it to my buddy the next morning and he said it was my lifters, so we put some lucas oil additive in there and swapped the thinner 5w-30 oil for thicker 10w-30, and the tick was gone, in the years that I owned it, the tick never came back. Sometimes thicker oil works wonders, especially if you're driving your Jeep a lot. I know some will disagree with me, but I've always ran thicker oil in all of my cars, Jeeps to BMWs.

I'm thinking it could be your lifters. Either that or you exhaust manifold, those are said to be prone to cracking, however, I've never cracked one (knock on wood), so I wouldn't really know what that would sound like. Might check there too.
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Old 05-07-2015, 05:46 PM
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Well, thank you! Yup, just drove around in my 717' inboard blowing things up. Well, me and 1200 of my best friends...the Navy is a team sport you know.

Happy Trails,
Bob
Right on, Bob. Hahahaha.... and yes, the Navy is a team sport. I am pretty familiar with all you squids. My father sailed on an LSM in the South Pacific during WWII and my brother sailed on the USS Kearsarge over there with you during Vietnam. Thanks again and as Jerry said, welcome home.

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So I had a 95 YJ with a 2.5 4cyl, I know I know, different beast all together. However, they are similar in design to a 4.0 6cyl. I took a trip about 70 miles or so from my house in my YJ, all high-way, and when I got to where I needed to be, I noticed the oil pressure would drop real low and then go back up, then drop, so on and so forth. Well I parked and enjoyed a nice home cooked meal and maybe three or four hours later I went and started up the Jeep and noticed this strange ticking noise, I popped the hood, couldn't see anything, so I just took it easy on the way home. I took it to my buddy the next morning and he said it was my lifters, so we put some lucas oil additive in there and swapped the thinner 5w-30 oil for thicker 10w-30, and the tick was gone, in the years that I owned it, the tick never came back. Sometimes thicker oil works wonders, especially if you're driving your Jeep a lot. I know some will disagree with me, but I've always ran thicker oil in all of my cars, Jeeps to BMWs.

I'm thinking it could be your lifters. Either that or you exhaust manifold, those are said to be prone to cracking, however, I've never cracked one (knock on wood), so I wouldn't really know what that would sound like. Might check there too.
Hahahaha!!!! I will knock on some wood for you too. Thanks for the shout out and I will be checking everything tonight or tomorrow and see if I can get it to repeat the symptoms. I can check it all out further then. If it was the lifters or rods, I have to imagine there is some damage done to them. It was pretty dang loud. Last time I made lifters or rods knock loud it was in a slant six powered Dodge Dart. I blew that engine. Hahahahaha!!!!!
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Old 05-07-2015, 07:28 PM
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Well, I just took it for a drive, not hard like yesterday, but the temp gauge got to 210. I shifted in and out of 4WD high and low, but the clicking or clanking did not duplicate. Everything shifted well and drove out well. Hmmmmmmm..... I guess I will just have to push it hard tomorrow and see if I can get it to happen again.
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Old 05-07-2015, 07:39 PM   #14
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any chance it the material in the CAT breaking up. Usually sounds like marbles in a can.
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Old 05-07-2015, 07:53 PM
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any chance it the material in the CAT breaking up. Usually sounds like marbles in a can.
I don't know, but since it clicks with the tempo of speed I would not think so.

To be honest, my thought yesterday was oil pump or oil sending unit and oil not getting to lifters, but then I thought it would do it at idle, but did not seem to do it then. Again, after driving it for only 20 minutes a little bit ago, it did not replicate. This makes me wonder if it has to do with the oil in the transmission or transfer case getting hot or something. I don't know. I will know more tomorrow though when I run the heck out of it and try to get it to do it again.
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Old 05-11-2015, 09:50 AM
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U joints good?
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Originally Posted by njs552 View Post
Can you take a video of it happening and post it? Maybe hearing it will help someone recognize it easier.

Have you checked the ujoints?
Quote:
Originally Posted by thedawgshow View Post
I have replaced drivers side axle u-joint and will be replacing the passenger side soon. and after that the drive shaft u-joints, but I have to tell you, I do not think those are it. I might be wrong as they do need replaced very soon.

As far as recording it, I will try to do that. I do not own a cell phone, but the better half does. I will have to get it to make the sound again though, as it is not constant and I think I will have to run it hard to make it happen again I think. I will try here sometime tonight.

Anyone know of anything in the transmission or transfer case that can make these kind of sounds?
Well, looks like you guys were dead on and I was dead wrong. I drove it a few more times but nothing longer than 20 minutes and could not replicate the sound, I decided to crawl underneath and see what I could find. I remembered you mentioned the driveshaft, so I reached up and grabbed it and WOW!!! It has a lot of play on it. Looks like it is time for a new one sooner than later. The old one is so rusty and nasty, I think I should just spend the money and get it all brand new. It will match all the other new stuff I have purchased and installed on it.

Thank you to all of you who chimed in to try and help me. You are all so very AWESOME and why this forum ROCKS!!!! __________________

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