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  #1  
Old February 23rd, 2017, 20:49
jk_surgeonfish jk_surgeonfish is offline
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What is this awful noise?

99XJ with AW4
Changed the exhaust header and after starting up I have this sound that is coming from the bottom of the oil pan.

Video: https://www.youtube.com/watch?v=Ij7e...ature=youtu.be

I have changed the exhaust header 4 times and am pretty proficient in doing so. Nothing out of the ordinary when I did it this time.

At first I thought... flex plate. Checked the bolts and they are tight. Don't see any cracks either. I ran it with the cover off and the noise does not increase. I would think it would be louder with the flex plate inspection cover removed.

Stuck lifter? I ran some Seafoam in oil for 10 miles and changed oil and filter. No change.

Does it in P, N or D.
Does it when cold or hot.

I can't imagine that I dropped something in the intake port not knowing so when changing the exhaust manifold. I would think the noise would be very loud up top if this were the case. This sounds like it is coming directly below the oil drain plug.

Standing over the engine it is not that noisy as you can hear from the video. Go underneath and it is loud.

When I changed the oil today it was clean with no debris.

Any suggestions as to what this may be? Hoping it is not a piston skirt.

Thanks!
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  #2  
Old February 23rd, 2017, 20:51
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

One more thing. The sound gets faster if I increase RPM.
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  #3  
Old February 23rd, 2017, 21:08
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Re: What is this awful noise?

I'm not going to tell you what it sounds like to me.

First I will tell you that it is very difficult to locate the origin of a sound in an environment of steel and concrete. Second, I will tell you to buy a decent mechanics stethoscope and start probing.
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Old February 24th, 2017, 07:00
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

Quote:
Originally Posted by Hypoid View Post
I'm not going to tell you what it sounds like to me.

First I will tell you that it is very difficult to locate the origin of a sound in an environment of steel and concrete. Second, I will tell you to buy a decent mechanics stethoscope and start probing.
Yes, you are correct hard to tell where the sound could be generated from. I plan on getting a stethoscope today. I have a feeling I will be pulling the oil pan to see some carnage.
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Old February 24th, 2017, 07:19
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Re: What is this awful noise?

to me it sounds like a lifter tick. not sure if an oil pump could make that noise but maybe.
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Old February 24th, 2017, 09:44
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Re: What is this awful noise?

Email heading your way Jonathan
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Old February 24th, 2017, 12:05
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

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Email heading your way Jonathan
Thanks Russ. Looking forward to it.
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Old February 24th, 2017, 12:10
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

Quote:
Originally Posted by Hypoid View Post
I'm not going to tell you what it sounds like to me.

First I will tell you that it is very difficult to locate the origin of a sound in an environment of steel and concrete. Second, I will tell you to buy a decent mechanics stethoscope and start probing.
Picked up a stethoscope. I should have had one in my toolbox years ago. I like it! I placed above each intake/exhaust on the block and they all sounded the same to me. Placed it on back of block by number 6 and the noise is more prevalent. Toward #1 on top of block can't really hear it well. On transmission can't hear it. Sounds like a diesel tractor when placed on bottom of oil pan.

I probed all over and was not able to pin point one specific location that jumps out and says here I am.

So what did this tell me? I don't think it is from the head by intake/exhaust.
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Old February 24th, 2017, 12:18
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Re: What is this awful noise?

Check along the lifter galley, use the distributor/cam sensor to block mounting point as your reference.

For me not being there, it sounds like a connecting rod. Rule out the lifters first.
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Old February 24th, 2017, 12:22
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Re: What is this awful noise?

If you can rule out the lifters: With the engine running, pull the plug wire on #6. If the knocking sound changes, drop the pan for a look.
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Old February 24th, 2017, 14:14
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

Quote:
Originally Posted by Hypoid View Post
If you can rule out the lifters: With the engine running, pull the plug wire on #6. If the knocking sound changes, drop the pan for a look.
I probed by the lifter galley. Nothing I can pinpoint. Pulled #6 plug wire. No change in sound.
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  #12  
Old February 24th, 2017, 16:21
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Re: What is this awful noise?

Quote:
Originally Posted by jk_surgeonfish View Post
I probed by the lifter galley. Nothing I can pinpoint. Pulled #6 plug wire. No change in sound.
Try it with #5?
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  #13  
Old February 24th, 2017, 16:26
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

Quote:
Originally Posted by Hypoid View Post
Try it with #5?
I pulled all of them and no difference. I took it down to a mechanic I know and they are perplexed. He is a good mechanic. Says that it does not sound like lifters or a piston. He says drive it and if it gets louder then we can look at it again.
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  #14  
Old February 24th, 2017, 18:23
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Re: What is this awful noise?

Years ago, I replaced a clutch for a coworker, on his 2WD XJ. When I was taking everything apart, I noticed the head pipe was loose at the manifold. It was LOUD! After I put everything together, including fixing the exhaust leak, I could hear the bottom end knocking. I told him about it, told him we could not hear the knocking before, because of the exhaust leak. After driving it for a few weeks, he insisted I had done something to his car...

How loud was the exhaust this time around?
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  #15  
Old February 24th, 2017, 18:43
jk_surgeonfish jk_surgeonfish is offline
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Re: What is this awful noise?

Quote:
Originally Posted by Hypoid View Post
Years ago, I replaced a clutch for a coworker, on his 2WD XJ. When I was taking everything apart, I noticed the head pipe was loose at the manifold. It was LOUD! After I put everything together, including fixing the exhaust leak, I could hear the bottom end knocking. I told him about it, told him we could not hear the knocking before, because of the exhaust leak. After driving it for a few weeks, he insisted I had done something to his car...

How loud was the exhaust this time around?
Not very loud. This noise would definitely be louder then it.
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