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Unread 06-17-2012, 01:20 PM   #1
jpin321
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2013 JK Wrangler 
 
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At what point is ticking a problem?

My 4.0 in my jeep has always ticked. I've also read through many of the threads on the issue. Being a previous owner of a cj5 and all the noise the engine made I haven't paid too much attention to it, since it runs just fine.

But recently it seems to be getting louder to the point I notice it consantly even driving down the road. I have attached a video of the noise, funny the ticking seems even louder in the video than it does in person.

Link to video http://dl.dropbox.com/u/54912085/VID...617_150144.mp4

My question is... is it time I need to start digging into this? I know my cj made about the same amount of valve train noise after i rebuilt it. My dad has ran the inline 6s all his life and says it sounds good to him but at this point I'm not so sure. Thougts? Thanks in advance.

Please don't flame me I'm getting tired of every post I make getting flammed.

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Unread 06-17-2012, 01:28 PM   #2
BioTex
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Personally. I feel that valve train ticking is about the only ticking noises that are acceptable for the longevity of the 4.0L. Lifter tick does cause premature wear, but it is more forgiving.

Your ticking could be the timing chain. I just replaced mine with 45K on the clock, and the engine ticking was cut in half. I now believe the rest is due to the valve train.
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Unread 06-17-2012, 01:36 PM   #3
jpin321
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Quote:
Originally Posted by BioTex View Post
Personally. I feel that valve train ticking is about the only ticking noises that are acceptable for the longevity of the 4.0L. Lifter tick does cause premature wear, but it is more forgiving.

Your ticking could be the timing chain. I just replaced mine with 45K on the clock, and the engine ticking was cut in half. I now believe the rest is due to the valve train.
That is kind-of the way I have always thought about the issue. It seem to have gotten much louder over the years. Guess thats the difference in 30k miles and 80+k miles. Reading all of the threads about ticking has made we worry more than I should. Guess I need to turn up the radio and drive on

I don't think my timing chain is making noise, although I can't be sure without a stethoscope. It sounds like it is louder toward the rear of the engine. But that could just be the way the sound is bouncing around in the engine compartment.
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Unread 06-17-2012, 01:46 PM   #4
BioTex
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Quote:
Originally Posted by jpin321 View Post

I don't think my timing chain is making noise, although I can't be sure without a stethoscope. It sounds like it is louder toward the rear of the engine. But that could just be the way the sound is bouncing around in the engine compartment.
So was mine. I think the bellhousing acts as an amphitheater.
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
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Unread 06-17-2012, 01:48 PM   #5
jpin321
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Lol, maybe I'll stop by my mechanics place next weekend let him stethoscope it to be sure.
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Unread 06-17-2012, 02:03 PM   #6
KeyserGogo
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I bought my 98 4.0 used with 72k on the clock. It came with a maintenance log so I knew it was well taken care of. It was ticking, clapping, and knocking upon start up, and quiets down once warmed up. Sounded like the abused 4.2 I had in my 88. I've tried changing brands of oil, seafoam, etc. with no change in the sound. 4 years later, I'm up to 141k miles and it sounds just like the day I bought it. I did the valve cover and oil pan gaskt a few months ago, and everything I could see looked fine. Still gets 15-17mpg and passes emissions... so I just assume it's a noisy engine. It's my 6th 4.0 powered vehicle, and they all ticked, so I'm with you, I just consider it normal. I guess you can check the timing chain like one poster suggested, but I just live with it.
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