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Old 08-14-2010, 03:47 PM   #1
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Timing Chain ? Slapping noise in 2.5 motor

Hello;

I am new to the world of Jeeps and to this forum.I see a great amount of Jeep wisdom going around and thought someone might be able to give me some assistance .
I bought this Jeep yesterday. It is a 1999 Wrangler SE with the 2.5 motor.
When I test drove the Jeep I did not hear this noise and not until I got it home and after the engine had warmed up I heard a slapping type noise coming from under the hood. At first I thought it was a fan rub or something like that,but the noise comes from inside the motor somewhere. One of my friends who is a Jeep fanatic listened to the sound and thought it was maybe a bearing in the water pump.I took it to a mechanic who listened to the engine with a stethoscope and he thinks it has something to do with the timing chain. After poking around a bit I found a thread in another forum about someone who had the same problems.
I ask the mechanic who is guessing it is a timing chain issue, what it would cost to repair it. He said about $1000.00 dollars. Upon hearing this I about cried.My wife is pissed off at me now and my male ego has been bruised. When I bought the vehicle I purchased it "As Is" and from a small used car lot, so the problem will probably fall 100 percent on my shoulders.
Any help other than the obvious " You should have been more careful buying this vehicle" would be greatly appreciated. I know I cannot afford a $1000.00 repair bill as I was just laid off.
Sorry to sound like such a numb skull on my first post, but I am not sure were else to turn. Maybe this repair is something I could do myself ...i dunno.Other than the engine problems I do love this Jeep and hope it is something that can be dealt with.

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Old 08-14-2010, 03:55 PM   #2
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Unfortunately, if it is inside the engine, you have to pay someone to strip it down or maybe even pull it to find the problem. This could be a lot of different issues. Can you describe where you hear it more accurately and exactly what it sounds like?

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Old 08-14-2010, 04:15 PM   #3
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Thanks....It is a noise almost like a dull slapping sound. It starts after the thing has warmed up some.It isn't a ticking sound and does not even sound like metal on metal.Maybe like a piece of plastic bouncing around in a round cylinder.
My first thought was something around the radiator cowling but it is father in towards the engine. Trying to locate the exact origin of the sound for me was impossible as well as a couple of my friends who also tried to pin it down. The mechanic used a stethoscope and placed it all over the engine. He was not for sure were it was coming from other than the engine and his "Guess" was around the timing chain area.After poking around for about 5 minutes with scope he just recommended i take it back to were I bought it...lol. The place I bought it from aint picking up the phone.
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Old 08-14-2010, 04:23 PM   #4
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Hmm, well call them on Monday but otherwise if it sound like a piece of plastic bouncing around in a cylinder its probably the bearings in your water pump. I have heard of this problem being described this way before. If you can, go to a Jeep Mechanic or specialist. Do not let some average mechanic diagnose your problems. I stopped going to the "Stealership" a long time ago.
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Old 08-14-2010, 04:32 PM   #5
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I hope you are right my friend. One of my buddies thought it might be the bearings also. Which I am hoping is a lot cheaper and maybe something I could do myself.Thanks again for your help.
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Old 09-21-2010, 11:33 AM   #6
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did you ever find out the answer? I think i have the same thing going on. Mine sounds somewhat like a chain rattleling. it only seems to do it at low rpms. I have 150,000 miles and most mechanics say it doesn't sound like a timing chain
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Old 09-21-2010, 11:53 AM   #7
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If you haven't found an answer, look in the fan shroud and see if you see any evidence of the blades striking it. It'll be easy to spot.

If you are concerned about it being the water pump, go ahead and replace it. They are under $100 (I got one for my 2.5L for $32.00) and swapped it in myself (along with doing a coolant flush and new thermostat). With an 11 yo jeep, it isn't a bad idea anyway. If it continues, you may want to consider finding a Hayne's manual (about $20.00) for your Jeep or better yet, a Factory Service Manual.

Most of the mechanical repairs are pretty easy on the early TJ's, especially the 2.5L.
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Old 09-21-2010, 12:04 PM   #8
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thanks. im gonna put a new water pump on this weekend. even if thats not the problem its not like it will hurt anything lol.
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Old 09-21-2010, 12:17 PM   #9
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Originally Posted by asphaltaddict
thanks. im gonna put a new water pump on this weekend. even if thats not the problem its not like it will hurt anything lol.
Good for you...
Don't let her Ruin your hopes.
Just keep tinkering with it. Maybe this would be a good time to do the work yourself with friends.
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Old 09-22-2010, 04:51 PM   #10
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I took it in and they repaired it. They told me it was the tensioner on the timing chain. They told me the reason it would start making the noise only after it was warmed up was because of thermal expansion , just enough to make the chain rub on the timing chain cover. Sound is now gone.
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Old 09-24-2010, 07:57 AM   #11
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Thats good to hear, and did they do it free of charge or a small fee? happy Jeeping and I hope the ol lady is off your back. Just maybe let her drive once if shes still mad

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