still have a vibration after new clutch

[oldiron]

I just got back on this problem this week. Problem is a vibration at any rpm over 2000. Heres the back story, Had a new diaphram clutch installed, old flywheel was resurfaced by a reputable machine shop. Clutch disc, pressure plate, tob, and pilot bearing came in a kit (LUK) from the same machine shop (Feltons clutch in Chatt). The vibration is a constant "humming" type felt more in the "seat of the pants" it starts mildly enough at around 2k and becomes more pronounced to 3k rpm. This is NOT a driveline problem, happens in neutral while stationary, clutch in or out, trans in gear with clutch in, etc. All accessories removed, still there. Ignition gone over, everything seems good. All mounts are good, no exhaust touching the frame/body.
Is there any way or procedure to definitively eliminate or confirm the clutch/pp/flywheel as the source of the problem? This is really annoying, not "stop me from driving it" annoying, but it's a problem i'd like to resolve.
Thanks for your time
Greg

 

[m_m70]

I had this same issue...Turned out to be from the fan of all things. Try removing belts and see what it feels like.

 

[doran4x]

Check your rear end. And driveshaft. Get up to speed and put the clutch in. If you still have it you can eliminate the engine / trans.


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[oldiron]

I had this same issue...Turned out to be from the fan of all things. Try removing belts and see what it feels like.

Tried that already. No change.

 

[oldiron]

Check your rear end. And driveshaft. Get up to speed and put the clutch in. If you still have it you can eliminate the engine / trans.


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Tried that too. Happens while stationary.

 

[blubuckaroo]

I'm still wondering about the flywheel or pressure plate.

When the flywheel was being resurfaced, maybe the balance weight got knocked off?
Is there a difference in balance weight between 302/351W and 5.0 pressure plates?
Maybe you got the wrong pressure plate?

 

[oldiron]

Guys, for reasons that at this point completely elude me....the vibration is all but gone. On a sustained 2750-3000 rpm drive across the mtn it has cleared itself up. I have NO explanation for why or how. I love a puzzle but this is frustrating. Ill try to figure this "gift" out and if its worth mentioning, can report the answers. Thanks to all who replied.
Greg

 

[73azbronco]

eng tran mounts shifted, broken?

 

[langester]

Do you have an older original harmonic balancer? Maybe it is starting to move on the worn out rubber causing a vibration until it slips into another position.
Just a thought, good luck with it!

 

[oldiron]

I havent looked there. Ill go check when it stops raining.
Thanks for the idea.
Greg