[ROVERNET - UK] more on shaft vibration

Paul Smith vmi2148 at bigpond.net.au
Sun Jun 20 08:35:10 BST 2004

The yokes Must be aligned!
Universal joints are NOT constant velocity joints, and produce vibration at
twice the input shatf rotational frequency if the inputs and outputs are
misaligned, and that include the yokes being Out.  The output uni cancels
the rotational vibration of the front uni, so normally there isn't a
problem.  Misalign the yokes and the double frequency vibration is passed to
the diff...


----- Original Message ----- 
From: "Gatrell David" <drnaramata at yahoo.com>
To: <rovernet at lyris.ccdata.com>
Sent: Sunday, June 20, 2004 4:33 AM
Subject: [ROVERNET - UK] more on shaft vibration

> Thank you for your answers to my enquiry.   The
> bearings do not have any play that I can feel.   Chalk
> marks on the shafts at an indicated 30 mph go all
> around the shafts and that is the speed where the
> steering wheel shakes most.   At engine idle speed the
> front of the front shaft has a high spot.   The rear
> shaft has high spots at each end and they are about 90
> degrees apart.   The centre bearing looks O.K. and
> firm.
> Can anyone tell me if I did a bad thing when I changed
> the automatic transmission fluid.   The rear
> transmission mount had to come off to get the pan off.
>  When I tried to reinstall the mount the transmission
> was nearly half an inch too high and I could not see
> why.   To get it down I put shims under the two front
> engine mounts.   That got the transmission mount in
> place but the rocker cover touched the heater box.
> So now there is just under 1/8" of shims under the
> front mounts and just over 1/8" of shims above the
> transmission mount.   I wonder if that is enough of a
> change to cause the vibration?   Also.   Is it normal
> for the yokes on the front drive shaft to be at 90
> degrees to each other?   The manual I have shows them
> in line.
> Again - all suggestions will be welcome.   Thank you.
> David
> 1965 P-5 Mk IIc
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