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Unread 08-11-2013, 08:18 PM   #1
SJHeup
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Knocking Underneath 2000 TJ (Automatic)

I've got 190K miles on my Jeep. No significant engine problems in the 10+ years I've had it.
But there is a knocking noise coming from underneath. It's not too loud when idle, but gets louder and accelerates as I accelerate. It still runs smooth and feel nothing out of the ordinary. I'm not very knowledgeable when it comes to "under the hood" stuff. The guy at NTB without looking at it said it sounds like a rod knock in the engine. So basically, he said it needs a new engine. My girlfriend's father who is a mechanic is looking at it next week and says it could be a rod, but it doesn't sound consistent with a rod knock and it has him somewhat stumped. Keeping my fingers crossed it's not the engine. Read a couple of things that said it could be something in the transmission. Just trying to research what it could possibly be when for when we get in there. Thanks for any help.

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Unread 08-11-2013, 09:34 PM   #2
KLboxer
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Could be your crank bearings are worn out. Anything in the lower end should be easily heard through the oil pan if you give a listen. Use the screwdriver trick* to isolate the location of the noise and that may narrow things down.

* The screwdriver trick is where you take a larger size screwdriver, hold the handle against your ear, and use the tip to probe around the engine compartment for the noise. It amplifies surprisingly well and can really help locate a problem noise. Just be careful and don't get your head, fingers, or the screwdriver mixed up in any of the moving parts.
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Unread 08-11-2013, 10:35 PM   #3
SJHeup
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Thanks! Doing the screwdriver trick is actually what got us thinking that it wasn't a bad rod. I just found a video of a Jeep running on bad crank bearings. Sounded pretty similar. No video of it accelerating though. Thanks!

Last edited by SJHeup; 08-12-2013 at 07:23 AM..
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Unread 08-12-2013, 07:08 AM   #4
uberxj92
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Try draining your oil now and run s magnet thru the oil. See if you get a lot of metal. That would indicate bearings.
You could have piston slap too.
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Unread 08-12-2013, 07:33 AM   #5
SJHeup
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Ok. So 2 great replies (thank you KLboxer and uberxj92). So when first researching engine replacement, i was looking at a cost of roughly $3000-$5000. Does anyone know would it cost to replace those bearings? I know I'm going to spend a good amount on a 13 year old with almost 200K miles, but like i said before, just doing the research.
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Unread 08-12-2013, 07:52 AM   #6
uberxj92
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Titan engines in ocala Florida. Great strokers. My family shop Is a machine shop. We get $2000 for full rebuild. It depends on where you live the prices. But you can get the stroker motors for same price as most rebuilds and crates.
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Unread 08-12-2013, 04:48 PM   #7
KLboxer
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Pulling the oil is a good suggestion. You can go one step further and take the oil filter apart as well and see if there is any metal in there.

After re-reading your mileage, you may want to check into the condition of the timing chain/timing chain tensioner. Seems like that could be a likely cause given the high miles.
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Unread 08-12-2013, 04:51 PM   #8
KLboxer
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Quote:
Originally Posted by KLboxer
Pulling the oil is a good suggestion. You can go one step further and take the oil filter apart as well and see if there is any metal in there.

After re-reading your mileage, you may want to check into the condition of the timing chain/timing chain tensioner. Seems like that could be a likely cause given the high miles.
The bearing replacement would be cheap parts wise if you can get away with it. Labor is the killer when replacing major engine components.
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Unread 08-12-2013, 05:23 PM   #9
hoaxci5
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Flexplate? Mine was just replaced because of this...

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Unread 08-12-2013, 05:42 PM   #10
SJHeup
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Quote:
Originally Posted by hoaxci5 View Post
Flexplate? Mine was just replaced because of this...

http://www.youtube.com/watch?v=FUCrZ...JPP5PEpkt1Zkyg
Sounds very similar. Did the knock get faster as you accelerated?
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Unread 08-12-2013, 06:44 PM   #11
hoaxci5
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It did but it wasn't any where near as noticeable at speed.
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Unread 08-14-2013, 10:50 AM   #12
uberxj92
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Auto could be torque converter bolt loose.
Or the Prius you hit still has people in it lol
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Unread 08-15-2013, 08:07 AM   #13
SJHeup
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Quote:
Originally Posted by uberxj92 View Post
Auto could be torque converter bolt loose.
Or the Prius you hit still has people in it lol
Thanks! And it was a Mini.
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Unread 08-15-2013, 08:12 PM   #14
SJHeup
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Hey guys and/or girls. I took a couple videos so you can hear what it sounds like.
Here it is from under the hood:

https://www.youtube.com/watch?v=oRbA...e_gdata_player

Here it is from underneath (mind the spider web)

https://www.youtube.com/watch?v=JK3T...e_gdata_player
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Unread 08-18-2013, 10:52 PM   #15
Mercwerx
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I'm going through the same thing, after taking off the pan there it was a broken piston skirt. It's a bit of work but not too bad
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