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Old 08-26-2014, 04:13 PM   #1
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2.5 Timing Chain

Got a text from my son, his 2000 2.5 engine stopped dead with a clunk and I suspect his chain may have snapped. (definite previous chain noise) Anyone have this happen and what was the outcome. Just waiting for the tow truck to get it home later so I can get a look see.

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Old 08-26-2014, 04:45 PM   #2
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You should be able to just replace the chain and tensioner and be good to go. I haven't swap mine but on a 4cyl, it would be quite easy to get to. You would have to rent a harmonic balancer puller and installer from AZ. I would go ahead and put on a new HB since you have it off. My guess is a worn or broken tensioner caused the slack and issue. Our TJs don't have interference engines so doubt if any engine damage.

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Old 08-26-2014, 04:53 PM   #3
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Quote:
Originally Posted by Wattapunk View Post
You should be able to just replace the chain and tensioner and be good to go. I haven't swap mine but on a 4cyl, it would be quite easy to get to. You would have to rent a harmonic balancer puller and installer from AZ. I would go ahead and put on a new HB since you have it off. My guess is a worn or broken tensioner caused the slack and issue.
I have changed one already so that's not a problem, any collateral damage to be concerned about. (I am hoping it's the chain right now)
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Old 08-27-2014, 04:41 AM   #4
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If it's just the chain then the engine would just die without damage since it's a non interference engine. May be a good idea to go ahead and install new sprockets while you are in there.
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Old 08-27-2014, 07:40 AM   #5
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Only exception is the 2.4 four banger used in the last TJ years
That one has a belt and although no piston to valve interference there is potential for intake to exhaust valve interference that can cause mechanical damage

But agree no interference issues with 2.5 or 4.0
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Old 08-27-2014, 04:01 PM   #6
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Originally Posted by Wattapunk View Post
If it's just the chain then the engine would just die without damage since it's a non interference engine. May be a good idea to go ahead and install new sprockets while you are in there.
Was going to buy the full kit regardless, still hoping that's the problem

Well it just got here so he can take out his new Craftsman tool set tonight and start digging in.
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Old 08-27-2014, 06:38 PM   #7
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Well timing chain appears to be it (goodguess on my part over the cell),
Looks like it took out the timing cover too.
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Old 08-28-2014, 02:07 PM   #8
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Well she's up and running, good to go.
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Old 08-28-2014, 03:56 PM   #9
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Good call on the diagnosis over the phone and great quick work to get it up and going! One lone positive on having that small 2.5cyl. So much easier to work on with that extra room. I will heed your knowledge once I need to change my timing chain.
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Old 08-28-2014, 06:07 PM   #10
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Good call on the diagnosis over the phone and great quick work to get it up and going! One lone positive on having that small 2.5cyl. So much easier to work on with that extra room. I will heed your knowledge once I need to change my timing chain.
When #2 son said it just stopped dead I immediately thought snapped chain, #1 son threw a rod on this same engine 4 years ago but it still ran. (like crap) Had the day off today and fortunately Advance had the parts including the cover available.
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Old 10-15-2014, 04:44 PM   #11
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I'm getting ready to do mine as well do to noise. Did you have to pull oil pan to take cover off?
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Old 10-15-2014, 05:27 PM   #12
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I'm getting ready to do mine as well do to noise. Did you have to pull oil pan to take cover off?

Not necessary, pull all the bolts around the perimeter of the cover and there are bolts (4 I think) that bolt up from the edge of the oil pan into the bottom of the timing cover.
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Old 10-15-2014, 08:39 PM   #13
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How did you get to the two bolts that hold the tensioner on? They at on the bottom side behind the tensioner bracket.
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Old 10-16-2014, 06:04 AM   #14
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Didn't need to remove the tensioner. Are you referring to the power steering pump bracket with the belt adjuster ?
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Old 10-16-2014, 06:42 AM   #15
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I am not. My T-chain tensioner busted, that is why I was having chain slap. There are two bolts that hold the t-chain tensioner on. They are located on the backside of the tensioner put in through the bottom.
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Old 10-16-2014, 09:46 AM   #16
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How many miles do the chains last in the 4.0 I have just at 300,000 miles
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Old 10-16-2014, 10:11 AM   #17
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My 2.5 has 147k. Tensioner broke. Just going to replace everything as a precaution.
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Old 10-16-2014, 05:50 PM   #18
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Originally Posted by Monkiejohnson View Post
My 2.5 has 147k. Tensioner broke. Just going to replace everything as a precaution.
Sorry I misunderstood. Yeah to get at those bolts the pan has to be dropped. I was able to reuse the bracket and just replace the rubber both times I did a replacement.
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Old 10-16-2014, 06:16 PM   #19
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That's what it looks like to me. So I can just take off the E clip and swap the actual spring tensioner assembly onto the old existing bracket? Therefore I don't have to drop pan?
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Old 10-16-2014, 07:05 PM   #20
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That's what it looks like to me. So I can just take off the E clip and swap the actual spring tensioner assembly onto the old existing bracket? Therefore I don't have to drop pan?
If the bracket is ok that's it, My sons bracket was distorted slightly so I just straightened it out a bit and swapped the tensioner.
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Old 10-16-2014, 08:49 PM   #21
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Sweet, that saves me a big headache.
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Old 10-23-2014, 10:49 AM   #22
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Parts finally came in and I got some time to get everything back together. Sounds so much better now! Wish I could have put that money towards my rear harness bar though. : (
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Old 10-23-2014, 04:59 PM   #23
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Parts finally came in and I got some time to get everything back together. Sounds so much better now! Wish I could have put that money towards my rear harness bar though. : (
Yeah but the sounds of silence has it's rewards also !
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Old 10-23-2014, 06:19 PM   #24
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That I does JimsJeep!

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