| stearing relay arm bushing [message #133829] |
Fri, 08 July 2011 17:07  |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
|
Senior Member |
|
|
The Revcon folks call it a bell crank, I think the part is more or less the same, right?
One end has a rubber bushing. The bushings seems to have a short life.
Some folks on the Revcon forum have replaced the bushing with bearings but I'm not sure all the right questions have been asked and answered.
Why did they use a flexible bushing in the first place?
Would changing to a bearing create trauma to the rest of the linkage?
The steering gear is the same as GMC, most of the other components are Toro.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
|
|
|
|
| Re: stearing relay arm bushing [message #133836 is a reply to message #133829] |
Fri, 08 July 2011 17:35  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
|
Senior Member |
|
|
| hertfordnc wrote on Fri, 08 July 2011 18:07 |
The Revcon folks call it a bell crank, I think the part is more or less the same, right?
One end has a rubber bushing. The bushings seems to have a short life.
Some folks on the Revcon forum have replaced the bushing with bearings but I'm not sure all the right questions have been asked and answered.
Why did they use a flexible bushing in the first place?
Would changing to a bearing create trauma to the rest of the linkage?
The steering gear is the same as GMC, most of the other components are Toro.
|
Dave: the GMC has a hole on one end for a ball joint on the drag link and a ball joint on the other end for connecting to the relay tie rod. No rubber bushings.
http://www.bdub.net/manuals/parts/GMCMH-Parts.pdf
section 16.002
C. Boyd
76 Crestmont
East Tennessee
|
|
|
|
| Re: stearing relay arm bushing [message #133838 is a reply to message #133836] |
Fri, 08 July 2011 17:44 |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
|
Senior Member |
|
|
| C Boyd wrote on Fri, 08 July 2011 17:35 |
Dave: the GMC has a hole on one end for a ball joint on the drag link and a ball joint on the other end for connecting to the relay tie rod. No rubber bushings.
http://www.bdub.net/manuals/parts/GMCMH-Parts.pdf
section 16.002
|
Thanks- i only had the pictures on Jimk's site to go by.
But that helps answer the question, it may be perfectly OK to replace it with a bearing.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
|
|
|
|
| Re: [GMCnet] stearing relay arm bushing [message #133839 is a reply to message #133829] |
Fri, 08 July 2011 17:55 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Dave,
With all due respect how would a bunch of guys that own GMC's be able to
tell you if the bell crank on a Revcon is the same as a relay lever on a
GMC?
You parted out a GMC and have a Revcon and would know better than any of us;
unless of course someone owns or has owned both.
Here's a link to a photo of the parts in the GMC steering system (no
steering box).
http://www.gmcmhphotos.com/photos/showphoto.php?photo=24138
The relay lever is the "boomerang" shaped (liked working that in there) item
on the far left. The standard OEM relay lever has a bronze bushed pivot
point that rides on a steel "top hat" and a rubber encased tapered shaft at
the end. However, this particular relay lever has been reworked by Dave
Lenzi and has a bushed taper at the end. Note the grease zerk.
http://www.bdub.net/lenzi/index.html#RelayLever
The rubber bushing at the end does wear and cause slack in the steering
hence Dave's mod. See the link above for a description of his mod.
According to Dave the reason for the flexible joints at the intermediate rod
end of the relay lever and both ends of the idler arm is to allow
misalignment of the parts when assembled and flexing in the frame.
Here's a link to a description of Dave's reworked idler arm:
http://www.bdub.net/lenzi/index.html#IdlerArm
When you install both these parts the only flexible joint left is the
urethane bushing on the idler arm pivot bolt. You must shim the idler arm to
assure the intermediate rod is parallel to the front cross member. That
insures that the bronze bushed tapered shafts of the relay lever and idler
arm enter the intermediate shaft at 90°. If the intermediate rod is not
parallel to the front cross member the steering linkage could bind.
Dave told me that he did make an idler arm with a bushing at the end that
pivots on the frame, however, he decided against selling them because it
required precision alignment of all the parts to prevent binding and even
then if the frame flexed too much it could bind.
Why did GM design the relay lever and idler arm the way they did, your guess
is as good as mine.
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 dave silva
Sent: Saturday, 9 July 2011 8:07 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] stearing relay arm bushing
The Revcon folks call it a bell crank, I think the part is more or less the
same, right?
One end has a rubber bushing. The bushings seems to have a short life.
Some folks on the Revcon forum have replaced the bushing with bearings but
I'm not sure all the right questions have been asked and answered.
Why did they use a flexible bushing in the first place?
Would changing to a bearing create trauma to the rest of the linkage?
The steering gear is the same as GMC, most of the other components are Toro.
--
Dave & Ellen Silva
Check out the website:
http://www.oldrv.net
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] stearing relay arm bushing [message #133844 is a reply to message #133839] |
Fri, 08 July 2011 18:59 |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
|
Senior Member |
|
|
| Robert Mueller wrote on Fri, 08 July 2011 17:55 |
Dave,
With all due respect how would a bunch of guys that own GMC's be able to
tell you if the bell crank on a Revcon is the same as a relay lever on a
GMC?
|
There are some smart guys among the Revcon folks but there just are not enough of them. The collective wisdom of this group is like a virtual engineer.
Even though the parts are not the same, we are still steering a five ton vehicle by a simalar means. So i figure someone could explain why one might use rubber bushing versus a bearing.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
