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Old 09-11-2012, 01:31 PM   #1
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newb here, need help

I know this topic has been covered before but after days of searching, I still haven't found an answer.
Why does my engine sound like a diesel? I changed my oil ( used castrol gtx 10w-30 with a bosch filter) and it now sounds like a diesel?
I can't determine if the sound comes from the top of the motor or the bottom. They only way to quiet the sound is by adding another 1/2 quart of oil!! That means I have 6 1/2 quarts in there! I really don't want to blow a seal with too much oil but It really sounds bad, and it doesn't go away at any rpm's. Any ideas??? I have an 03 wrangler with the 4.0 5 speed. it has 77000 miles. Thanks

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Old 09-11-2012, 01:35 PM   #2
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check your manifold for cracks.

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Old 09-11-2012, 01:37 PM   #3
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ok I will start there. Thanks
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Old 09-11-2012, 04:11 PM   #4
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It took me a little bit but No cracks in the manifold that I could find.
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Old 09-12-2012, 07:22 AM   #5
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I would say its the manifold, they come stock with cracks apparently. If not check the fan clutch and see if there's any play
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Old 09-12-2012, 07:55 AM   #6
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So it dont make the noise with another 1/2 quart added??
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Old 09-12-2012, 09:40 AM   #7
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Could be piston skirt slap. Makes the 4.0L sound like a diesel.

Here's a thread to get you started, lots more on a search:
Piston skirts - NAXJA Forums -::- North American XJ Association

As said in the last post in that thread, it is not uncommon, and usually benign.
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Old 09-12-2012, 01:22 PM   #8
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It still makes the sound with another 1/2 quart added but it is not as loud. I am taking it to unlimited off road in Fenton mi this Saturday. These guys specialize in jeeps , rebuilds and off road mods. They said they would help me figure out the sound.
I am hoping it is the manifold but I couldn't see anything. I am hoping it isn't pistons or bearing.
I will post again once I get this figured out.
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Old 09-15-2012, 05:19 PM   #9
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I took it out to offload unlimited and the result is ........ The lifters. They said if it gets worse they will need
to be redone but for now it is normal to hear them. They said the 4.0 is a very noisy engine and even fired up
a few jeeps they had there and they all sounded the same as mine ( except for the one with the hemi)!!!
Thanks for all who responded.
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Old 09-16-2012, 12:14 PM   #10
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lifter swap is a pain in the !#!$. You pretty much have to rebuild the top end. If you are doing the lifters...need to do the camshaft..if you doing the camshaft...replace the timing chain...a new thermostat is a good idea too. I did it in my 03 Rubicon a few years ago.. hit me up if you need any advice...I will tell you this...be ready to remove the grill if you dont lift the engine out :P
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Old 09-17-2012, 02:54 PM   #11
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Thanks Wench!!!! I am going to rebuild it eventually but not until I finish fixing other things, ex u-joints, throw-out bearing, and a few other minor things.

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