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New sound from the 4.0?

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Old 02-13-2015, 03:26 PM
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Default New sound from the 4.0?
Okay so on the way home today my '93 with the 4.0 started a new thing. A horrible tapping coming front the front of the engine, sounds like a 90's model powerstroke, cadence-wise. Changes speed along with the engine speed. Any help?
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Old 02-13-2015, 03:30 PM
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Check the flexplate bolts
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Old 02-13-2015, 11:08 PM
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Cracked manifold
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Old 02-14-2015, 06:59 AM
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Originally Posted by 93jeepin
Okay so on the way home today my '93 with the 4.0 started a new thing. A horrible tapping coming front the front of the engine, sounds like a 90's model powerstroke, cadence-wise. Changes speed along with the engine speed. Any help?
Check to see if your harmonic balancer has separated if it's coming from the FRONT of the engine.
Attached Thumbnails New sound from the 4.0?-harmonic-balancer-failure.jpg  
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Old 02-14-2015, 11:38 AM
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Originally Posted by cruiser54
Check to see if your harmonic balancer has separated if it's coming from the FRONT of the engine.
How common is this? Age related or luck of the draw?
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Old 02-14-2015, 11:38 AM
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Originally Posted by Larry's XJ
How common is this? Age related or luck of the draw?
Pretty common either way.
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Old 02-14-2015, 05:23 PM
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Yeah it's the harmonic balancer. It's no completely seperated but the outer ring is shaking on the inner ring, hitting the block in the process. That's where my noise is coming from.
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Old 02-14-2015, 09:09 PM
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Originally Posted by 93jeepin
Yeah it's the harmonic balancer. It's no completely seperated but the outer ring is shaking on the inner ring, hitting the block in the process. That's where my noise is coming from.
Not surprised, given your description in your first post. Replace it.
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Old 02-14-2015, 11:19 PM
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Got a new one on the way, thanks dude!
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Old 02-15-2015, 06:16 AM
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Originally Posted by 93jeepin
Got a new one on the way, thanks dude!
Got a puller/installer?
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Old 02-16-2015, 12:43 AM
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Getting them, yes
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