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Can you diagnose this engine noise?

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Old 05-18-2023 | 04:53 PM
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From: Port Orchard , WA
Year: 1988
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Default Can you diagnose this engine noise?
I’m hearing it only underneath, seems loudest towards the rear of the block. Anybody have any ideas?
Doesnt change much with increase in rpms
Last edited by Tan88; 05-18-2023 at 05:13 PM.
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Old 05-18-2023 | 05:11 PM
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Link to the video

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Old 05-19-2023 | 08:53 AM
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It doesn't increase with engine speed at all?


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Old 05-19-2023 | 01:52 PM
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Originally Posted by cruiser54
It doesn't increase with engine speed at all?
No it actually quiets down and goes away. Sorry should have mentioned that
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Old 05-19-2023 | 04:35 PM
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Next time you hear it, shut the engine off, wait 10 seconds and restart. Noise gone?
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Old 05-19-2023 | 06:59 PM
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Originally Posted by cruiser54
Next time you hear it, shut the engine off, wait 10 seconds and restart. Noise gone?
No it is still making the noise. What were you thinking that could be? Thanks for your time. Have enjoyed your website
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Old 05-19-2023 | 07:08 PM
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Manual trans?
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Old 05-19-2023 | 10:04 PM
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Originally Posted by cruiser54
Manual trans?
Yes. I’ve recently replaced pilot bearing, flywheel and clutch if that matters.
I just went to start it and the starter was loose. Looks like the bolts are too short and stripped out the threads. The bell housing one looks salvageable but the starter one is no bueno. Don’t know if this has any relation.
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Old 05-19-2023 | 10:26 PM
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The 2 bolts for the starter.

One is metric. One is SAE.

Perhaps they got installed opposite?
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Old 05-19-2023 | 10:58 PM
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Originally Posted by cruiser54
The 2 bolts for the starter.

One is metric. One is SAE.

Perhaps they got installed opposite?
I hope I’m not that dumb. 😩. Here are the bolts that came out. The finer thread 14 mm bolt was on top and the coarser thread on bottom.

Ones a 14mm ones a 17mm.
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Old 05-19-2023 | 11:05 PM
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I don't remember any starter bolts being 17mm head.
Taxing my memory here, but I think the SAE bolt, 9/16" head.
Metric bolt, 15mm head?
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Old 05-19-2023 | 11:09 PM
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Found this on the interwebs

https://www.jeepforum.com/threads/wh...-4-0l.4391725/
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Old 05-20-2023 | 12:16 AM
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Originally Posted by cruiser54
Thanks! I’ll get it figured out in a couple days. I don’t know if that’s the source of the noise. That would be nice though
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Old 06-02-2023 | 07:08 PM
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Default Starter is fixed. Noise still there
Starter is in with longer bolts. Noise still there though. I took another video of the noise. This time I revved it up to show how it goes away after.

https://youtube.com/shorts/LX-MEAfT63A?feature=share
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Old 07-07-2023 | 08:44 PM
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Bump. Thinking it’s a lifter. Can anybody confirm? Thanks
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