I6 engine vibration

Apr 15, 2004 3 Replies
S

Hi,



I recently replaced the failed harmonic balancer (vibration damper) on my '90 XJ 4.0L I6 5-speed. The vibration I was suffering lessened, but it is still very noticeable at around 2000 RPM (any gear, any speed). Anyone ever have any similar problems after replacing the HB on an I6?



I removed the serpentine and ran the engine to confirm that no other component on the belt line was the culprit. Sure enough: no belt, same vibe.



The new balancer looks good. It rotates with no discernible shimmy or wobble. One thing I did notice: the original balancer had a single balancing hole bored in it. The aftermarket replacement had two holes bored in it. Does this mean I got the wrong part?



My next step is to get a balancer from the dealer$hip and try that. Is there anything else I can try first before throwing more dollars into it? If it turns out that another balancer doesn't help, what next?



Thanks,



Steve


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D

Steve did pass the time by typing:

Have some of the same issues, mine looked like this for the 93 4.0 not that things didn't change.

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Vibration at a specific RPM reguardless of driving speed (or in N) could be the flywheel/clutch/or something internal.

Or maby even a busted motor mount?

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S

Thanks Doug.

Did your vibes completely clear after you replaced the HB?

Mounts look okay. Guess I'll try another HB as a last ditch before going in for the clutch.

Steve

DougW wrote:

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Steve did pass the time by typing:

Not entirely but the persistant belt squeek in humid weather did. The HB wasn't quite gone, just slightly wobbly and walked back a bit.

As it stands I'm slowly getting things cleared up. Right now it's a pissing match with a vac leak following replacing the old cracked exhaust manifold. Plus a few other noises under the hood and some vibrations on acceleration that could be U joints (even though they feel tight).

I'm not certain how a HB would be that off, but it's "fairly easy" to do if you have the right tools. :)

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