| Rear alignment [message #215616] |
Thu, 25 July 2013 01:27  |
Kirk
Messages: 80
Registered: April 2008
Karma: 0
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I’ve been installing the Manny reaction arm disc brake kit on the back of the coach with 80 mm calipers on the front and a P30 master cylinder. Attached is the rear alignment I did. I held a laser level on the individual rear hub faces to a target and measured to the frame to check bogie alignment. I also used a straight edge across both hubs and the laser level to check the total bogie alignment. There is so much spring in the bogie arms you have to go way past the alignment point to bend the arms. My question is what’s your opinion? Am I close enough or should I keep bending? I saved a table of the measurements in GMC photos. Thanks, Kirk
http://www.gmcmhphotos.com/photos/alignment/p50077-my-rear-alignment.html
Kirk & Eloise Yeager -
Motorcyclists/RVers/Dog Lovers -
77 Royale 455/TBI/3:55 -
49ers - N. Nevada -
NdnKirk at Gmail dot com
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| Re: [GMCnet] Rear alignment [message #215617 is a reply to message #215616] |
Thu, 25 July 2013 02:05  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Kirk,
As well as you obviously understand the alignment and as carefully as
you've documented what you've done, I'm almost reluctant to say anything
except "Hoorah!". But, looking at your data, it appears to me that the "As
Left" toe measurements are the differences between your near- and
far-target distances from the frame. If that's true, your actual toe, as
commonly specified, is far less than shown. The manual's toe
specifications are based on measuring between the center lines of the tires
ON the tires themselves. That is, over a span of about 30", 15" forward of
the spindle and 15" aft of the spindle -- from side to side. If you
measure at a greater distance than that, you increase the accuracy of your
measurement, but the tolerance increases in direct relation to that
distance.
Example: For front toe, I like to use 60" beams on each front wheel. If I
were shooting for 1/8" toe out, I'd adjust to have the fronts of the beams
1/4" farther apart than the rears since the beams are twice as long as the
tires' diameters. If the beams were 120" long, I'd shoot for 1/2"
difference. You've posted the data to calculate what your actual toe
settings are, but I didn't bother to calculate them -- WAG is you're 4X
better than you state.
I suspect I've misread your data. Congratulations on the quality of your
work. Now, I hope you also installed the "True Tracks" so the center
settings will stay there. :-) (Manny tells me not many people are ordering
those -- a BIG mistake, IMHO.)
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Wed, Jul 24, 2013 at 11:27 PM, Kirk <ndnkirk@gmail.com> wrote:
>
>
> I’ve been installing the Manny reaction arm disc brake kit on the
> back of the coach with 80 mm calipers on the front and a P30 master
> cylinder. Attached is the rear alignment I did. I held a laser level on
> the individual rear hub faces to a target and measured to the frame to
> check bogie alignment. I also used a straight edge across both hubs and
> the laser level to check the total bogie alignment. There is so much
> spring in the bogie arms you have to go way past the alignment point to
> bend the arms. My question is what’s your opinion? Am I close
> enough or should I keep bending? I saved a table of the measurements in
> GMC photos. Thanks, Kirk
>
> http://www.gmcmhphotos.com/photos/alignment/p50077-my-rear-alignment.html
> --
> Kirk & Eloise Yeager -
> Motorcyclists/RVers/Dog Lovers -
> 77 Royale 455/TBI/3:55 -
> 49ers - N. Nevada -
> NdnKirk at Gmail dot com
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Rear alignment [message #215642 is a reply to message #215617] |
Thu, 25 July 2013 10:31 |
Kirk
Messages: 80
Registered: April 2008
Karma: 0
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Member |
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Thanks for the comment Ken, you confirmed my thinking on this. I'm close enough. Manny included his true tracks in the kit.
I had Chuck Alger true tracks on the front bogies that Chuck had removed from the rear bogies of his coach when he designed his version of the reaction arm brakes. They are now available.
Kirk & Eloise Yeager -
Motorcyclists/RVers/Dog Lovers -
77 Royale 455/TBI/3:55 -
49ers - N. Nevada -
NdnKirk at Gmail dot com
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| Re: Rear alignment [message #215700 is a reply to message #215688] |
Thu, 25 July 2013 20:54 |
Kirk
Messages: 80
Registered: April 2008
Karma: 0
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The camber was within 1/2* of 0* on all four prior to bending the bogies I'm not that concerned that it might have changed a little. I think the PO may have hit a curb on the passenger side. The drivers side as found wasn't off much; I guess it just settled in over time. Thanks, Kirk
Kirk & Eloise Yeager -
Motorcyclists/RVers/Dog Lovers -
77 Royale 455/TBI/3:55 -
49ers - N. Nevada -
NdnKirk at Gmail dot com
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| Re: [GMCnet] Rear alignment [message #215748 is a reply to message #215738] |
Fri, 26 July 2013 10:13 |
Kirk
Messages: 80
Registered: April 2008
Karma: 0
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Member |
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Sorry the "True Tracks" are already spoken for.
Kirk & Eloise Yeager -
Motorcyclists/RVers/Dog Lovers -
77 Royale 455/TBI/3:55 -
49ers - N. Nevada -
NdnKirk at Gmail dot com
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