[ROVERNET - UK] Differential Harmonic Damper

Vern Klukas vern at inkspotco.com
Tue Jul 11 00:24:50 BST 2006

I drove from Victoria to kelowna, 300 miles or so, with the damper 
slid off the rubbers once. other than stopping about halfway to find 
out what the thumping noise was (the damper is quite heavy and thumps 
around quite a bit) I noticed nothing unusual. But then, then is 
likely to be a harmonic deal, and the vibration would show up 
suddenly at the correct shaft speed, so it is quite possible I never 
operated at the correct engine speed for long enough for the 
vibration to get excited.


>The Rover P6 models utilize a harmonic damper on the differential extension
>housing, a heavy iron band clamped around the housing and supported by 3
>rubber pads.  The service manual contains dire warnings about not disturbing
>the damper, "as special equipment is necessary for correct tuning of the
>component."  That may have been all well and fine back when the car was
>relatively new but now that my 2000TC is nearing 40 years old, the rubber
>pads have deterioriated to the point where they need replacement.
>The Parts book shows no part number for these things.  Have any of you
>fellow Roverites attempted to replace these rubber parts and if so, with
>what?  Is the vibration damper all that critical?  Has anyone tried running
>with it removed?  How does one go about 'tuning' the thing without 'special
>equipment'?  Any hints, thoughts, suggestions, etc. would be welcome.  BTW I
>did swap out the 2000TC diff for one from a 3500S, wanting to get a more
>favorable gear ratio and take adavantage of the beefier 3500S design (4
>spider, stronger case, etc.).  Are there any differences between the
>vibration dampers on the two diffs?
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Vern Klukas                             I'm a little . . .
Inkspot Type & Design
vern at inkspotco.com

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