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My new Manny 1 ton [message #240702] Fri, 21 February 2014 08:42 Go to next message
kerry pinkerton is currently offline  kerry pinkerton   United States
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
Senior Member
Back last year when I got serious about my coach, I ordered a Manny 1 Ton. Ken suggest we install it at his place using his rack and alignment tools but he was on his walkabout and then had Caddy problems and....

So with GMCMI coming up I drove down Monday and we installed it. If Ken is as tired as I was he didn't show it and I'm whupped!

How Bob Dunahugh did this whole job in a day by himself is beyond me! We had two full days of very steady activity.

It's a straight forward installation and Karen Bradley's instructions are very clear but for some reason we had a couple things that caused us to strain a bit.

The Ken had two torsion bar unloaders and I had brought mine also. Because of the difference in geometry of the lower arm, we had to raise the porkshop A LOT. A LOT!!!!

I don't know how long he and I were under the coach pulling on the ceremonial cheater bar on the unloader but my shoulders and upper arms are still sore. We ended up using almost ALL the length of the original adjuster screws. I'd recommend having longer bolts on hand and will suggest to Manny that he include them.

Doing the alignment was a real education and learning and understanding the process was worth the trip in itself. The only thing still to do is center the steering wheel. I (Kerry A. Pinkerton) did not have the steering wheel centered when we did the final alignment and as a result the wheel is oriented at 7 o'clock instead of 6 o'clock. Embarassed Embarassed I had to leave yesterday to beat last nights storms (tornado warnings and power outages) so we didn't have time to fix it. I can do that easily enough however.

Still drives much better and will be even better once the steering box is centered. NO rut wander. Brakes seem a bit better but will improve as they break in.

I'm very impressed with the kit. VERY well fabricated and complete. I thought I might want to do some additional welding or reinforcement but after looking the control arms over, it's clear that whoever did the welding knew what they were doing. All I did was paint them.

We did have one 'issue' during the removal of the original parts. We could not get one of the spindle nuts off. Ken had the correct big socket and a Craftsman extension bar and the ceremonial cheater bar and we were both hanging on it. The extension bar was bending about 2" and I suggested to Ken that we just leave it all together. A bit heavier but we got it off and out of the way. I've got a friend with a 1" impact wrench that will remove it.

Good product. Good friends. Good time. It is so much more fun to work on these things with someone else.


Kerry Pinkerton - North Alabama Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
Re: My new Manny 1 ton [message #240707 is a reply to message #240702] Fri, 21 February 2014 09:07 Go to previous messageGo to next message
mikethebike is currently offline  mikethebike   United States
Messages: 331
Registered: January 2014
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Senior Member
HEAT helps remove stubbornness!

Photos? $$$$$

Re: My new Manny 1 ton [message #240709 is a reply to message #240702] Fri, 21 February 2014 09:13 Go to previous messageGo to next message
SeanKidd is currently offline  SeanKidd   United States
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
Senior Member
Congrats on your Accomplishment, what was your/Ken's procedure for setting the porkchops...position of the LCA, position of the TB tool to begin the torsion process? We're you able to achieve proper ride height? How many threads are left? I am one of the lucky enough to get a pair of Peter Huber TBs to go with my Hubler 1-Ton. And would like to know the "right way" of setting them up...

Thanks,
Sean (currently 2" Low in the front, waiting for the snow to melt) Kidd


Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers

[Updated on: Fri, 21 February 2014 09:14]

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Re: [GMCnet] My new Manny 1 ton [message #240728 is a reply to message #240709] Fri, 21 February 2014 11:42 Go to previous messageGo to next message
Kingsley Coach is currently offline  Kingsley Coach   United States
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Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
Senior Member
Mike
Could you put a signature line in like the other 2 guys?
Just doing the mental geography...

Mike in NS


On Fri, Feb 21, 2014 at 11:13 AM, Sean Kidd <Seankidd@ptd.net> wrote:

>
>
> Congrats on your Accomplishment, what was your/Ken's procedure for setting
> the porkchops...position of the LCA, position of the TB tool to begin the
> torsion process? We're you able to achieve proper ride height? How many
> there's dal left? I am one of the lucky enough to get a pair of Peter
> Huber TBs to go with my Hubler 1-Ton. And would like to know the "right
> way" of setting them up...
>
> Thanks,
> Sean (currently 2" Low in the front, waiting for the snow to melt) Kidd
> --
> Sean and Stephanie
> 73 Ex-CanyonLands 26' #317 "Oliver"
> Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms,
> Fluorescent Mineral Capital of the World, New Jersey
> http://www.gmcmhphotos.com/photos/u23595-seankidd.html
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>



--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS

* This is my second trip through the 60's; the first time the drugs were
better !
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Re: My new Manny 1 ton [message #240733 is a reply to message #240702] Fri, 21 February 2014 12:00 Go to previous messageGo to next message
kerry pinkerton is currently offline  kerry pinkerton   United States
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
Senior Member
Ken didn't have a heat source. We used ATF/Acetone penetrating oil liberally...on everything. Good stuff btw.

About the first thing we did was unload the torsion bars and REMOVED the adjuster bolt and plate. That way we could do whatever we wanted and not worry about having to back the adjuster bolt out of the way.

Once we got everything assembled and the coach on the ground, we had a HUGE negative camber (tires leaned in about 1.5" at the top.

We raised the coach a good bit with the unloader tool and got the camber looking better. Did a gross alignment to set toe in a bit, and went for a drive to settle the suspension. Then we put on Ken's alignment jigs and laser and set the toe so it was parallel to the frame. His process is documented in the photo site.

Here is one link:

http://www.gmcmhphotos.com/photos/g5963-1-ton-installation.html

And his is the link to his alignment tools:

http://www.gmcmhphotos.com/photos/g5634-wheel-alignment-jigs.html

We went through this process several times and each time got a bit closer. Finally the laser was parallel to the frame on both sides, the toe was 0 and camber was 89.2 degrees (close enough to no camber which is the target. We had adjusted for MAX camber AND MAX caster.


Kerry Pinkerton - North Alabama Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
Re: [GMCnet] My new Manny 1 ton [message #240768 is a reply to message #240707] Fri, 21 February 2014 15:02 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
Senior Member
Go to the Photo Site and search for 1 Ton.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426



-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of mike foster
Sent: Saturday, February 22, 2014 2:07 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] My new Manny 1 ton



HEAT helps remove stubbornness!

Photos? $$$$$


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
Re: [GMCnet] My new Manny 1 ton [message #240769 is a reply to message #240702] Fri, 21 February 2014 15:16 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
Senior Member
Kerry,

I bought a couple of these last year on sale and used a 25% off coupon:

http://www.harborfreight.com/3-4-quarter-inch-heavy-duty-impact-wrench-66984.html

A thousand foot pounds will remove it or shear it! ;-)

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: Kerry Pinkerton

We did have one 'issue' during the removal of the original parts. We could not get one of the spindle nuts off. Ken had the
correct big socket and a Craftsman extension bar and the ceremonial cheater bar and we were both hanging on it. The extension bar
was bending about 2" and I suggested to Ken that we just leave it all together. A bit heavier but we got it off and out of the way.
I've got a friend with a 1" impact wrench that will remove it.

--
Kerry

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
Re: My new Manny 1 ton [message #240848 is a reply to message #240702] Sat, 22 February 2014 11:13 Go to previous messageGo to next message
Jim Rountree is currently offline  Jim Rountree   United States
Messages: 47
Registered: July 2010
Location: San Antonio, TX
Karma: 0
Member
Kerry
What was your caster setting. was this max?


Jim Rountree San Antonio,TX 76 PB, 76 Royale RB
Re: [GMCnet] My new Manny 1 ton [message #240849 is a reply to message #240702] Sat, 22 February 2014 11:29 Go to previous messageGo to next message
ljdavick is currently offline  ljdavick   United States
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
Senior Member

On Feb 21, 2014, at 6:42 AM, Kerry Pinkerton <Pinkertonk@MCHSI.com> wrote:

> Good product. Good friends. Good time. It is so much more fun to work on these things with someone else.

Kerry - excellent post and nobody has said a truer statement than that.

What Dan says.

Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA

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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
Re: My new Manny 1 ton [message #240853 is a reply to message #240702] Sat, 22 February 2014 12:05 Go to previous messageGo to next message
Richard RV   United States
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Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
Senior Member
[quote title=Kerry Pinkerton wrote on Fri, 21 February 2014 07:42.
The Ken had two torsion bar unloaders and I had brought mine also. Because of the difference in geometry of the lower arm, we had to raise the porkshop A LOT. A LOT!!!!

I don't know how long he and I were under the coach pulling on the ceremonial cheater bar on the unloader but my shoulders and upper arms are still sore. We ended up using almost ALL the length of the original adjuster screws. I'd recommend having longer bolts on hand and will suggest to Manny that he include them.
[/quote]

Hey Kerry. Thanks for confirming I'm not nuts...at least not entirely. A while back I had asked about people's experience with they one ton torsion bars additional windup. There was really no mention of how much more the TBs have to be wound up to compensate for the longer lever arm on the one ton. That I do not understand.

I took up the approximately 7/8" of thread on the original bolt and it wasn't enough. I now have the longer bolts in place, and that puts me at the correct ride height, but the ride is definitely more compliant.

My coach rode and handled great before and I don't like the ride and handling of the more compliant front end as much. I also have some of Peter Huber's stiffer TBs on order and hope to have them installed in a couple or three weeks.

What type(s) of unloader tools did you use? I picked up a C-clamp type on eBay and it's a lot easier and quicker to use.

Richard
Currently in Tecopa Hot Springs, CA


'77 Birchaven TZE...777; '76 Palm Beach under construction; ‘76 Edgemont waiting its turn
Re: [GMCnet] My new Manny 1 ton [message #240857 is a reply to message #240853] Sat, 22 February 2014 12:29 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma: -62
Senior Member
Just an observation based on installing and adjusting and aligning a large
number of Hubler Version II 1 ton conversions. It is apparent to me that
most GMCers do not measure their front ride height very often, if at all.
When we did ride height measurements at GMCWS at Casa de Fruta, we used at
least 4 person crews to measure all coaches as they entered the
registration area. After a day and a half, we suspended the operation. We
had more than enough data to thoroughly document that most GMCs were low in
front, some by as much as 3 inches. And nearly as many were too high in the
rear, some at the maximum upper limits. The different length of the
position of the lower control arms, is NOT what accounts for the torsion
bars being out of adjustment. The age of the coach and all of it's 40 year
old rubber parts, plus the inaccuracies of measuring ride height with
notched sticks, knotted string, scientific wild assed guesses, and probably
some incantations that I am not aware of is what accounts for most of it.
Sprinkled into the mix is a lack of knowledge about how the relationship
between front and rear ride height affects steering and front end geometry
also plays a part. Then, when a 1 Ton front end is installed, with all the
suspension parts new at the same time, what is left is, what was wrong
before the installation was commenced. The front end was too low before the
install started, and it is still too low after you are done. No big suprise
to me. I have seen a lot of it. Fairly easy to correct if the 40 year old
torsion bars have not given up the ghost. But a lot of them are beginning
to finally show their age, kinda like me, sags and wrinkles. Helps to think
of the 1 Ton install as a face lift on a person. Once that is done, it
draws attention to other parts that might use some cosmetic or major
surgery to correct what time has done.(Very Big Grin) Your experience will
vary.
Jim Hupy
Salem, OR
78 GMC Royale 403


On Sat, Feb 22, 2014 at 10:05 AM, Richard <GMC77Birchaven@yahoo.com> wrote:

>
>
> [quote title=Kerry Pinkerton wrote on Fri, 21 February 2014 07:42.
> The Ken had two torsion bar unloaders and I had brought mine also.
> Because of the difference in geometry of the lower arm, we had to raise
> the porkshop A LOT. A LOT!!!!
>
> I don't know how long he and I were under the coach pulling on the
> ceremonial cheater bar on the unloader but my shoulders and upper arms are
> still sore. We ended up using almost ALL the length of the original
> adjuster screws. I'd recommend having longer bolts on hand and will
> suggest to Manny that he include them.
> [/quote]
>
> Hey Kerry. Thanks for confirming I'm not nuts...at least not entirely. A
> while back I had asked about people's experience with they one ton torsion
> bars additional windup. There was really no mention of how much more the
> TBs have to be wound up to compensate for the longer lever arm on the one
> ton. That I do not understand.
>
> I took up the approximately 7/8" of thread on the original bolt and it
> wasn't enough. I now have the longer bolts in place, and that puts me at
> the correct ride height, but the ride is definitely more compliant.
>
> My coach rode and handled great before and I don't like the ride and
> handling of the more compliant front end as much. I also have some of Peter
> Huber's stiffer TBs on order and hope to have them installed in a couple or
> three weeks.
>
> What type(s) of unloader tools did you use? I picked up a C-clamp type on
> eBay and it's a lot easier and quicker to use.
>
> Richard
> Currently in Tecopa Hot Springs, CA
> --
> '77 Birchaven TZE...777
> _______________________________________________
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> Unsubscribe or Change List Options:
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>
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Re: [GMCnet] My new Manny 1 ton [message #240862 is a reply to message #240857] Sat, 22 February 2014 13:19 Go to previous messageGo to next message
Richard RV   United States
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
Senior Member
Hey Jim. I can't speak to other peoples' coaches but I know my ride height was correct and that the front end was stiffer before the conversion. Now the front end feels closer to the plush ride of the rear end and it's just short of what I consider wallowing on twisty roads. I had a crisp ride before, but not now, and that doesn't point to tired torsion bars.

Richard


'77 Birchaven TZE...777; '76 Palm Beach under construction; ‘76 Edgemont waiting its turn
Re: [GMCnet] My new Manny 1 ton [message #240863 is a reply to message #240862] Sat, 22 February 2014 13:27 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
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Senior Member
Richard, then the next question that I have is, "Did you replace your
shock absorbers? Then: "What is the condition of your sway bar bushings
and links?", and finally, What tire and inflation pressures are you using?
Trying to be helpful, not critical at all intended.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Feb 22, 2014 11:19 AM, "Richard" <GMC77Birchaven@yahoo.com> wrote:

>
>
> Hey Jim. I can't speak to other peoples' coaches but I know my ride
> height was correct and that the front end was stiffer before the
> conversion. Now the front end feels closer to the plush ride of the rear
> end and it's just short of what I consider wallowing on twisty roads. I
> had a crisp ride before, but not now, and that doesn't point to tired
> torsion bars.
>
> Richard
> --
> '77 Birchaven TZE...777
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Re: [GMCnet] My new Manny 1 ton [message #240900 is a reply to message #240848] Sat, 22 February 2014 19:27 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
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Registered: March 2004
Location: Americus, GA
Karma: 9
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Jim,

As usual, I didn't bother to measure the caster. What I do is set the
offset rear bushings all the way in-board, to give maximum caster. Then
adjusting the camber, using only the front eccentrics. Then we take it for
a ride (after setting toe, of course). If it doesn't pull to either side,
we call that as good as we can get and leave it alone. It hasn't happened
yet, but if it pulled to one side or the other, I'd "tweak" the caster on
one side (remembering "it pulls to caster" to try to alleviate that, but
probably still wouldn't bother to measure caster.

Since we're mostly all agreed that we want as much caster as we can get,
that's what I set. With that ground rule, measuring caster would just be
to seek "bragging rights", for which I don't have much use. Besides, it's
a PITA and only an approximation anyway (have you ever gone through the
pages of 3 dimensional geometry required to come up with the very
approximate "fudge factors" we use?). Here's a pretty good example of that
solution:

http://www.disco3.co.uk/gallery/albums/userpics/24543/steering-geometry-and-caster-measurement%5B1%5D.pdf

http://goo.gl/Yzi5j1

I suspect my sloppy process wouldn't satisfy you. :-)

Ken H.


On Sat, Feb 22, 2014 at 12:13 PM, Jim Rountree wrote:

>
> Kerry
> What was your caster setting. was this max?
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] My new Manny 1 ton [message #240903 is a reply to message #240853] Sat, 22 February 2014 19:31 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Richard,

I, too, seemed to notice that the front rides slightly softer with the
1-Ton. But I don't find it a cornering problem, probably because of the
big old stiff Caspro sway bar up front.

We used the "U-bolt" unloaders. I have two of them. Kerry was still
complaining the next day about sore shoulders. At 77, I don't do much of
that weight lifting. :-)

Ken H.


On Sat, Feb 22, 2014 at 1:05 PM, Richard wrote:

>
> ...
> My coach rode and handled great before and I don't like the ride and
> handling of the more compliant front end as much. I also have some of Peter
> Huber's stiffer TBs on order and hope to have them installed in a couple or
> three weeks.
>
> What type(s) of unloader tools did you use? I picked up a C-clamp type on
> eBay and it's a lot easier and quicker to use.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] My new Manny 1 ton [message #240908 is a reply to message #240900] Sat, 22 February 2014 19:50 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
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Registered: May 2010
Karma: -62
Senior Member
Ken, on the basic first time set up, I kinda do what you do. Turn the
eccentrics on the upper rear to get as much caster as possible. Set the
front eccentrics about half way through the adjustment range, snug it up so
it won't move. Put the coach down on the turning plates and look at the
camber. If it is even on both sides, and some where near "0", I check the
ride height quick and dirty and then drive the coach several miles, roll it
back in onto the turn plates as straight as possible, and set my high
dollar camber gage on each side and check it. If it is + or - a 1/2 degree
and drives all right, I pretty much leave it alone. Toe is more critical. I
like 0" to 1/16" toe in to start with on a GMC. Every other front wheel
drive vehicle that I have ever messed with likes some toe out, but a GMC
will wander and rut run with toe out. I use Jerry Work's laser setup for
toe. I have a fancy toe gage, but it is hard to hold up correctly and read,
and it has a tendency to move when I take the readings. I have double
checked Jerry's set up against actual tape measurement on toe and it is
dead bang on the money. In my personal experience GMC ride height is very
critical to have correct before any attempt is made to align a coach. The
accuracy of the floor plays a part here too. Just sayin' that a gravel
patch is not the ideal place to do ride height or alignment. More to it
than what I have stated here, but when it is all said and done, if it
drives well and does not scrub tires off, that is usually close enough. If
it is correct in February, it might not be by August, so pretty close is
mostly O.K.
Jim Hupy
Salem, OR
78 GMC Royale 403


On Sat, Feb 22, 2014 at 5:27 PM, Ken Henderson <hend4800@bellsouth.net>wrote:

> Jim,
>
> As usual, I didn't bother to measure the caster. What I do is set the
> offset rear bushings all the way in-board, to give maximum caster. Then
> adjusting the camber, using only the front eccentrics. Then we take it for
> a ride (after setting toe, of course). If it doesn't pull to either side,
> we call that as good as we can get and leave it alone. It hasn't happened
> yet, but if it pulled to one side or the other, I'd "tweak" the caster on
> one side (remembering "it pulls to caster" to try to alleviate that, but
> probably still wouldn't bother to measure caster.
>
> Since we're mostly all agreed that we want as much caster as we can get,
> that's what I set. With that ground rule, measuring caster would just be
> to seek "bragging rights", for which I don't have much use. Besides, it's
> a PITA and only an approximation anyway (have you ever gone through the
> pages of 3 dimensional geometry required to come up with the very
> approximate "fudge factors" we use?). Here's a pretty good example of that
> solution:
>
>
> http://www.disco3.co.uk/gallery/albums/userpics/24543/steering-geometry-and-caster-measurement%5B1%5D.pdf
>
> http://goo.gl/Yzi5j1
>
> I suspect my sloppy process wouldn't satisfy you. :-)
>
> Ken H.
>
>
> On Sat, Feb 22, 2014 at 12:13 PM, Jim Rountree wrote:
>
> >
> > Kerry
> > What was your caster setting. was this max?
> > --
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Re: [GMCnet] My new Manny 1 ton [message #240914 is a reply to message #240908] Sat, 22 February 2014 21:01 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Jim,

You've described almost exactly what I do, using my homemade jigs and a
Sears digital level with laser beam. After setting the wheels parallel to
the frame rails, I attache a 60" long aluminum square tube to the
horizontal portion of the jigs. The difference between the measurements
between the ends of the two tubes is twice the toe. On Kerry's we had,
IIRC, 1/32" actual toe-in.

One difference is that I normally never lift the coach. If I use the
polyethylene "turn plates" at all, we push the coach onto them. I do, of
course, drive the coach a few miles between checks.

Ken H.


On Sat, Feb 22, 2014 at 8:50 PM, James Hupy wrote:

> Ken, on the basic first time set up, I kinda do what you do. Turn the
> eccentrics on the upper rear to get as much caster as possible. Set the
> front eccentrics about half way through the adjustment range, snug it up so
> it won't move. Put the coach down on the turning plates and look at the
> camber. If it is even on both sides, and some where near "0", I check the
> ride height quick and dirty and then drive the coach several miles, roll it
> back in onto the turn plates as straight as possible, and set my high
> dollar camber gage on each side and check it. If it is + or - a 1/2 degree
> and drives all right, I pretty much leave it alone. Toe is more critical. I
> like 0" to 1/16" toe in to start with on a GMC. Every other front wheel
> drive vehicle that I have ever messed with likes some toe out, but a GMC
> will wander and rut run with toe out. I use Jerry Work's laser setup for
> toe. I have a fancy toe gage, but it is hard to hold up correctly and read,
> and it has a tendency to move when I take the readings. I have double
> checked Jerry's set up against actual tape measurement on toe and it is
> dead bang on the money. In my personal experience GMC ride height is very
> critical to have correct before any attempt is made to align a coach. The
> accuracy of the floor plays a part here too. Just sayin' that a gravel
> patch is not the ideal place to do ride height or alignment. More to it
> than what I have stated here, but when it is all said and done, if it
> drives well and does not scrub tires off, that is usually close enough. If
> it is correct in February, it might not be by August, so pretty close is
> mostly O.K.
> Jim Hupy
> Salem, OR
> 78 GMC Royale 403
>
>
> On Sat, Feb 22, 2014 at 5:27 PM, Ken Henderson <hend4800@bellsouth.net
> >wrote:
>
> > Jim,
> >
> > As usual, I didn't bother to measure the caster. What I do is set the
> > offset rear bushings all the way in-board, to give maximum caster. Then
> > adjusting the camber, using only the front eccentrics. Then we take it
> for
> > a ride (after setting toe, of course). If it doesn't pull to either
> side,
> > we call that as good as we can get and leave it alone. It hasn't
> happened
> > yet, but if it pulled to one side or the other, I'd "tweak" the caster on
> > one side (remembering "it pulls to caster" to try to alleviate that, but
> > probably still wouldn't bother to measure caster.
> >
> > Since we're mostly all agreed that we want as much caster as we can get,
> > that's what I set. With that ground rule, measuring caster would just be
> > to seek "bragging rights", for which I don't have much use. Besides,
> it's
> > a PITA and only an approximation anyway (have you ever gone through the
> > pages of 3 dimensional geometry required to come up with the very
> > approximate "fudge factors" we use?). Here's a pretty good example of
> that
> > solution:
> >
> >
> >
> http://www.disco3.co.uk/gallery/albums/userpics/24543/steering-geometry-and-caster-measurement%5B1%5D.pdf
> >
> > http://goo.gl/Yzi5j1
> >
> > I suspect my sloppy process wouldn't satisfy you. :-)
> >
> > Ken H.
> >
> >
> > On Sat, Feb 22, 2014 at 12:13 PM, Jim Rountree wrote:
> >
> > >
> > > Kerry
> > > What was your caster setting. was this max?
> > > --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] My new Manny 1 ton [message #240921 is a reply to message #240900] Sat, 22 February 2014 21:49 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
Senior Member
Ken,

I have Dave Lenzi's offset upper control arms in Double Trouble and when I installed them he noted NOT to set the caster above 5°
because the outer CV joints were at or getting close to the max they could handle at 5° caster when you turn hard left or right.

It might be a good idea to check and see what you've got.

He also noted that 0° caster was what was desired because radial tires like to run flat against the road surface.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: Ken Henderson

Jim,

As usual, I didn't bother to measure the caster. What I do is set the
offset rear bushings all the way in-board, to give maximum caster. Then
adjusting the camber, using only the front eccentrics. Then we take it for
a ride (after setting toe, of course). If it doesn't pull to either side,
we call that as good as we can get and leave it alone. It hasn't happened
yet, but if it pulled to one side or the other, I'd "tweak" the caster on
one side (remembering "it pulls to caster" to try to alleviate that, but
probably still wouldn't bother to measure caster.

Since we're mostly all agreed that we want as much caster as we can get,
that's what I set. With that ground rule, measuring caster would just be
to seek "bragging rights", for which I don't have much use. Besides, it's
a PITA and only an approximation anyway (have you ever gone through the
pages of 3 dimensional geometry required to come up with the very
approximate "fudge factors" we use?). Here's a pretty good example of that
solution:

http://www.disco3.co.uk/gallery/albums/userpics/24543/steering-geometry-and-caster-measurement%5B1%5D.pdf

http://goo.gl/Yzi5j1

I suspect my sloppy process wouldn't satisfy you. :-)

Ken H.

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
Re: [GMCnet] My new Manny 1 ton [message #240923 is a reply to message #240921] Sat, 22 February 2014 22:41 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Hmmmm...I can't believe that with only offset bushings at the rear and no
modifications to the control arms that we'll ever get near 5* caster.
About 3.5* is all I found when I still bothered. Especially if it's
necessary to add positive camber, which reduces caster.

I'm not going to worry about it, especially since I don't know whether the
1-Ton CV's can tolerate more or less max angle. Don't spend much time
turning at full lock anyway.

Are you sure he didn't say 0* CAMBER is what we want for radials?

Ken H.


On Sat, Feb 22, 2014 at 10:49 PM, Robert Mueller wrote:

> Ken,
>
> I have Dave Lenzi's offset upper control arms in Double Trouble and when I
> installed them he noted NOT to set the caster above 5°
> because the outer CV joints were at or getting close to the max they could
> handle at 5° caster when you turn hard left or right.
>
> It might be a good idea to check and see what you've got.
>
> He also noted that 0° caster was what was desired because radial tires
> like to run flat against the road surface.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] My new Manny 1 ton [message #240930 is a reply to message #240923] Sat, 22 February 2014 23:26 Go to previous messageGo to previous message
sgltrac is currently offline  sgltrac   United States
Messages: 2797
Registered: April 2011
Karma: 1
Senior Member
The Pig is real close to a pair of fives castor , 0 camber and Leeds than an eighth of toe. Freight train stable one to two finger drive. Stock suspension poly/conventional a arm bushings ( conventional with offset in rear ear of uppers) poly in lowers new rubber everywhere else. Stock sway bar and no slop in bjs.

Todd Sullivan

Sully
77 royale
Seattle

> On Feb 22, 2014, at 8:41 PM, Ken Henderson <hend4800@bellsouth.net> wrote:
>
> Hmmmm...I can't believe that with only offset bushings at the rear and no
> modifications to the control arms that we'll ever get near 5* caster.
> About 3.5* is all I found when I still bothered. Especially if it's
> necessary to add positive camber, which reduces caster.
>
> I'm not going to worry about it, especially since I don't know whether the
> 1-Ton CV's can tolerate more or less max angle. Don't spend much time
> turning at full lock anyway.
>
> Are you sure he didn't say 0* CAMBER is what we want for radials?
>
> Ken H.
>
>
>> On Sat, Feb 22, 2014 at 10:49 PM, Robert Mueller wrote:
>>
>> Ken,
>>
>> I have Dave Lenzi's offset upper control arms in Double Trouble and when I
>> installed them he noted NOT to set the caster above 5°
>> because the outer CV joints were at or getting close to the max they could
>> handle at 5° caster when you turn hard left or right.
>>
>> It might be a good idea to check and see what you've got.
>>
>> He also noted that 0° caster was what was desired because radial tires
>> like to run flat against the road surface.
>>
>>
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Sully 77 Royale basket case. Future motorhome land speed record holder(bucket list) Seattle, Wa.
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