[ROVERNET - UK] Differential Harmonic Damper

Tom Trafton v8rover at earthlink.net
Tue Jul 11 00:40:06 BST 2006

Given that all of our P6 models are accumulating some age on them and given
that I have never heard anyone mention that they were having problems with
the damper, I am beginning to think that this component isn't all that
critical.  Vern, you just described the worst case scenario and didn't
notice anything other than the thumping/clunking that one would expect from
a heavy iron ring banging around against the housing.  BTW, what did you do
to replace the rubber mounts?  They must have all falling off on the road
somewhere, forcing you to replace them.

----- Original Message ----- 
From: "Vern Klukas" <vern at inkspotco.com>
To: <rovernet at lyris.ccdata.com>
Sent: Monday, July 10, 2006 4:24 PM
Subject: Re: [ROVERNET - UK] Differential Harmonic Damper

> 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.
> Yours
> Vern
> >The Rover P6 models utilize a harmonic damper on the differential
> >housing, a heavy iron band clamped around the housing and supported by 3
> >rubber pads.  The service manual contains dire warnings about not
> >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
> >with it removed?  How does one go about 'tuning' the thing without
> >equipment'?  Any hints, thoughts, suggestions, etc. would be welcome.
> >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?
> >
> >Tom
> >
> >
> >
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> -- 
> Vern Klukas                             I'm a little . . .
> Inkspot Type & Design
> vern at inkspotco.com
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