[Saloon-lovers] Panhard Rubber Bushes

I recently stripped the panhard rod off the axle of my 66 MK2 to
redo the bushes. I ordered new ones from one of the usuals and
upon inspection they seem to be much smaller in outer diameter than
the originals which were 2’’ in diameter. I ordered a second set
and they were the same. The old larger diameter bushes matches the
washers that were fitted so I am thinking that these smaller
diameter washers squeeze to a larger size? Does this sound right?
Kevin
Long Beach–
Lambsfoot
Long Beach, United States
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In reply to a message from Lambsfoot sent Thu 2 Apr 2009:

Hi Kevin, I encountered the same problem. I do not know if they
will settle in. I managed to get an NOS set from am E-Bay Seller
some time ago.–GNB–
The original message included these comments:

I recently stripped the panhard rod off the axle of my 66 MK2 to
redo the bushes. I ordered new ones from one of the usuals and
upon inspection they seem to be much smaller in outer diameter than
the originals which were 2’’ in diameter. I ordered a second set


DAIMLER : V8 SALOONS SAFELY FAST AND BUILT TO LAST
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In reply to a message from Lambsfoot sent Thu 2 Apr 2009:

Kevin,
I’ll check my new bushes which are still on the bench, awaiting
installation.

Tom–
The original message included these comments:

I recently stripped the panhard rod off the axle of my 66 MK2 to
redo the bushes. I ordered new ones from one of the usuals and
upon inspection they seem to be much smaller in outer diameter than
the originals which were 2’’ in diameter. I ordered a second set
and they were the same. The old larger diameter bushes matches the
washers that were fitted so I am thinking that these smaller
diameter washers squeeze to a larger size? Does this sound right?
Kevin


1960 Mk 2, 1968 Rover 2000TC, 2001 XJ8, Los Angeles, CA
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In reply to a message from Lambsfoot sent Thu 2 Apr 2009:

Kevin,
I just measured the washers which are 1 7/8 in. dia and the rubber
bushes which are 1 3/8 dia. I think the bushes will flatten out
and grow in diameter when you tighted down the Panhard Rod nuts.
I’m not sure that the dia is all that critical so I am going with
the small rubber bits.
Tom

PS Why don’t you try yours first then tell me if they fail:-)–
The original message included these comments:

I recently stripped the panhard rod off the axle of my 66 MK2 to
redo the bushes. I ordered new ones from one of the usuals and
upon inspection they seem to be much smaller in outer diameter than
the originals which were 2’’ in diameter. I ordered a second set
and they were the same. The old larger diameter bushes matches the
washers that were fitted so I am thinking that these smaller
diameter washers squeeze to a larger size? Does this sound right?


1960 Mk 2, 1968 Rover 2000TC, 2001 XJ8, Los Angeles, CA
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In reply to a message from 302Rover sent Thu 2 Apr 2009:

your old ones were just nackered the rubber had deterioated (havnt
you noticed all the fourty year old rubber in your jag is flat and
hard) flatterned out you should have used the first lot you brougth
they were A1. its simple panel out those little discs get the new
rubber put it in. also staigthen the treaded piece or it will go
round funny. put a die over it to clean it up. tap out the nuts and
internal tread. be generous with the copper coat and bolt it up
do your radius arms at the same time. yeah it was 1 7/8 but 1/4
inch thick and the new ones are a half inch thick have you heard of
poissons ratio this is a classic case

Poisson’s ratio (�), named after Simeon Poisson, is the ratio of
the contraction or transverse strain (normal to the applied load),
to the extension or axial strain (in the direction of the applied
load).

When a sample cube of a material is stretched in one direction, it
tends to contract (or occasionally, expand) in the other two
directions perpendicular to the direction of stretch. Conversely,
when a sample of material is compressed in one direction, it tends
to expand (or rarely, contract) in the other two directions. This
phenomenon is called the Poisson effect. Poisson’s ratio (�) is a
measure of the Poisson effect.

from wikipedia–
ovrdrv
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In reply to a message from ovrdrv sent Fri 3 Apr 2009:

oh they matched the disc cause there all roooted to the other
diamter is suppose to be a little lip put will have flatterned out–
ovrdrv
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In reply to a message from ovrdrv sent Fri 3 Apr 2009:

Thanks for the science lesson. My math is not what it used to be
but with a Poissons ratio of 0.5 I can’t see how a external
diameter of 1.0’’ can expand to 1.75’’ when compressed by only 0.040’’
when the internal diameter does not change.
Kevin–
The original message included these comments:

do your radius arms at the same time. yeah it was 1 7/8 but 1/4
inch thick and the new ones are a half inch thick have you heard of
poissons ratio this is a classic case
Poisson’s ratio (�), named after Simeon Poisson, is the ratio of
the contraction or transverse strain (normal to the applied load),
to the extension or axial strain (in the direction of the applied
load).


Lambsfoot
Long Beach, United States
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In reply to a message from Lambsfoot sent Fri 3 Apr 2009:

you can help some of the people some of the time you cant help
every one all off the time–
ovrdrv
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In reply to a message from ovrdrv sent Fri 3 Apr 2009:

glad lyons and co didnt have your got no use for reading and
writing mentality,0.04 inch =1mm what are you on about? I know you
yanks havnt advanced to the metric system but Im starting to
beleive you never made it to the moon either, be lucky to get to
the bus stop.–
ovrdrv
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In reply to a message from ovrdrv sent Sat 4 Apr 2009:

The old ones had only compressed 1mm or 0.04’’ when compared to the
new ones. This is why I question your logic assuming that the new
ones will grow by 0.75’’ if I compress them 0.04’’ or 1mm. I think
the vendor sent me the wrong bushes.

I installed them this morning and set the axle to the center to
test your theory and the diameter did not grow as you theorized.

Kevin–
The original message included these comments:

glad lyons and co didnt have your got no use for reading and
writing mentality,0.04 inch =1mm what are you on about? I know you
yanks havnt advanced to the metric system but Im starting to
beleive you never made it to the moon either, be lucky to get to
the bus stop.


Lambsfoot
Long Beach, United States
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In reply to a message from Lambsfoot sent Sat 4 Apr 2009:

that is why you replaced the old ones because they were rooted
the rubber was no longer elastic and would not rebound,it had
become soft and mallable as had all the other rubber in your jag
every single peice the door seals all the grommets every single
peice of rubber in the car the door seals are flat and hard unless
they had been replaced. same with your panhard rubbers they are
flat and wide. the old panard rubbers no longer behaved as an
elastic material. 40 years will do that. If you measure your new
bushes and compare the volume of material with the old they will be
similar.Brand new ones will not compress much cause there new.
the old ones will cause there rooted. when there new they behave as
a linear elastic material. when there old and rooted they behave as
a plastic material and plastic deformation takes place it took
fourty years for this too happen,at which point the bushes have
failed.Over the years no doubt the treads have been tigthened to
take up the slack.
If that occured straigth after installation that would be a
disappointment.now your installed your bushes you can get on with
the next job. like everytime you go for a ride replace the panhard
bushes.
and if you compare the old bushes with the new and think they have
the same properties or behave in the same why I wil be amazed.like
hit then both with a hammer and gauge the rebound. try and fold the
new one in half.bet you can the old.–
ovrdrv
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