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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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Quote:
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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