[DeTomaso] Steering wheel shimmy
jderyke at aol.com
jderyke at aol.com
Wed Apr 19 16:10:23 EDT 2017
The small amount of caster possible (-2.5 degrees negative) in a Pantera with an all-stock front end can induce shimmy or road wander. If this is what's causing the nervousness, its a function of tire inflation pressure, width & rubber compliance, road surface and maybe a little wear in ball joints and the rack bushing. With around -4 degrees negative, nervousness disappears on most cars with big tires. Some may call this a 'mask', not a fix, but it often cures the problem. You can easily check the whole assembly for 'true' by jacking up one wheel and slowly spinning it with a dial indicator barely touching the sidewall, or the edge of the tread if its not serrated. Good luck, Tom- J Deryke
-----Original Message-----
From: Tom Baranek Garage <tbaranek at earthlink.net>
To: detomaso <detomaso at server.detomasolist.com>
Sent: Wed, Apr 19, 2017 11:54 am
Subject: [DeTomaso] Steering wheel shimmy
On my 1973 Pantera, I replaced the steering rack washer (with the brass one) YEARS ago.
The tires/wheels do not feel out of balance and the shimmy in the steering is more pronounced (when it is there) when I turn the wheel/change lanes. Sometimes going straight at highway speeds (and above) the steering wheel is often rock solid/smooth.
I have Pantera East 17" Campy replicas and am sure they are true, etc...but I will have them checked. Since the vibration goes away completely (sometimes), I'm thinking it is in the bushings or something like that???
Any known/obvious things I should check?
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-------------- next part --------------
The small amount of caster possible (-2.5 degrees negative) in a
Pantera with an all-stock front end can induce shimmy or road wander.
If this is what's causing the nervousness, its a function of tire
inflation pressure, width & rubber compliance, road surface and maybe a
little wear in ball joints and the rack bushing. With around -4 degrees
negative, nervousness disappears on most cars with big tires. Some may
call this a 'mask', not a fix, but it often cures the problem. You can
easily check the whole assembly for 'true' by jacking up one wheel and
slowly spinning it with a dial indicator barely touching the sidewall,
or the edge of the tread if its not serrated. Good luck, Tom- J Deryke
-----Original Message-----
From: Tom Baranek Garage <tbaranek at earthlink.net>
To: detomaso <detomaso at server.detomasolist.com>
Sent: Wed, Apr 19, 2017 11:54 am
Subject: [DeTomaso] Steering wheel shimmy
On my 1973 Pantera, I replaced the steering rack washer (with the brass
one) YEARS ago.
The tires/wheels do not feel out of balance and the shimmy in the
steering is more pronounced (when it is there) when I turn the
wheel/change lanes. Sometimes going straight at highway speeds (and
above) the steering wheel is often rock solid/smooth.
I have Pantera East 17" Campy replicas and am sure they are true,
etc...but I will have them checked. Since the vibration goes away
completely (sometimes), I'm thinking it is in the bushings or something
like that???
Any known/obvious things I should check?
_______________________________________________
Detomaso Email List is not managed by POCA
Posted emails must not exceed 1.5 Megabytes
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or approve the archiving of list messages.
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