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Clearance 80mm Calipers When Installing Steel Wheels [message #112414]

Wed, 19 January 2011 13:44

Jim Wagner

Messages: 339
Registered: February 2004
Location: Brook Park, Oh

Karma: 0

Senior Member

Rob,
I was doing more thinking on my 80mm calipers. After I cleaned off the tit and the burr that was rubbing the rim I did take a little more off for added clearance. My thinking is that if I have clearance with new pads as the pads wear the clearance will increase. I ran this way for at least three years brfore I installed the spacers.
Jim Wagner

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112421 is a reply to message #112414]

Wed, 19 January 2011 15:50

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Jim, when you run the 80MM calipers with new rotors and thick pads like the
yellow ceramic ones with steel wheels, that is the combination that usually
runs into interference (clearance) problems. After the pads are worn and the
rotors have been turned, there is more clearance between the inside of the
wheel and the caliper. If they don't rub, no spacer is needed. That is
another reason why I sometimes try to go off net with this info, because
nearly every case is different.
Jim Hupy
Salem, Or
78 GMC Royale 403

On Wed, Jan 19, 2011 at 11:44 AM, Jim Wagner <slwjmw@sbcglobal.net> wrote:

>
>
> Rob,
> I was doing more thinking on my 80mm calipers. After I cleaned off the tit
> and the burr that was rubbing the rim I did take a little more off for added
> clearance. My thinking is that if I have clearance with new pads as the pads
> wear the clearance will increase. I ran this way for at least three years
> brfore I installed the spacers.
> Jim Wagner
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
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>
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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112424 is a reply to message #112421]

Wed, 19 January 2011 16:42

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

James Hupy wrote on Wed, 19 January 2011 15:50

...
That is another reason why I sometimes try to go off net with this info, because nearly every case is different.
...

#define Offnet Bad //Minimum information shared
#define Onnet good //Maximum sharing of information

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112426 is a reply to message #112424]

Wed, 19 January 2011 16:49

kelvin

Messages: 608
Registered: February 2004
Location: Eugene, OR

Karma: 0

Senior Member

On 1/19/2011 2:42 PM, Keith V wrote:
>
> James Hupy wrote on Wed, 19 January 2011 15:50
>> ...
>> That is another reason why I sometimes try to go off net with this info, because nearly every case is different.
>> ...
>
> #define Offnet Bad //Minimum information shared
> #define Onnet good //Maximum sharing of information

I completely agree... unless Onnet = "Me, too",

Or other such useless information.

Just sayin'...
Kelvin

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112438 is a reply to message #112426]

Wed, 19 January 2011 22:33

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Everyone, I have had some of my posts kicked out for being too lengthy. If
anyone wants information more than the brief? format I use, I would be happy
to talk off net with anyone who asks. It is not an imposition on me and I
take the role of GMCWS Tech VP seriously. I just don't want my lengthy posts
to be a problem for all. If a summary format is info enough, you decide. If
you want more indepth info, then we can go off net for personal attention. I
feel a real sense of obligation to help out fellow GMCers any way I can.
That is why I am on the black list, and help others by working on their
coaches. I really don't know the meaning of the word retirement
anyhow.<Grin>
Jim Hupy
Salem, Or
78 GMC Royale 403

On Wed, Jan 19, 2011 at 2:49 PM, Kelvin Dietz <kelvin@datsuns.com> wrote:

> On 1/19/2011 2:42 PM, Keith V wrote:
> >
> > James Hupy wrote on Wed, 19 January 2011 15:50
> >> ...
> >> That is another reason why I sometimes try to go off net with this info,
> because nearly every case is different.
> >> ...
> >
> > #define Offnet Bad //Minimum information shared
> > #define Onnet good //Maximum sharing of information
>
> I completely agree... unless Onnet = "Me, too",
>
> Or other such useless information.
>
> Just sayin'...
> Kelvin
>
>
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>
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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112440 is a reply to message #112438]

Wed, 19 January 2011 23:03

hal kading

Messages: 642
Registered: February 2004
Location: Las Cruces NM

Karma: 4

Senior Member

Jim,

Your posts are full of good information. I for one do not mind the long posts. Keep them coming.

Hal Kading 78 Buskirk Stretch Las Cruces NM

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112448 is a reply to message #112440]

Thu, 20 January 2011 05:50

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

Me too. Being too verbose myself, I sure can't object.

Ken H.

On Thu, Jan 20, 2011 at 12:03 AM, Hal Kading wrote:

>
>
> Jim,
>
> Your posts are full of good information. I for one do not mind the long
> posts. Keep them coming.
>
> Hal Kading 78 Buskirk Stretch Las Cruces NM
> _______________________________________________
>
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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: Clearance 80mm Calipers When Installing Steel Wheels [message #112457 is a reply to message #112414]

Thu, 20 January 2011 08:00

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

I kind of think I need to jump in here.

I often write long explanations as I discovered long ago that when thinking people (most all the readers here) understand the entire situation, things go better when they come across the inevitable snag.

When at rallies (my rare face to face with other GMC owners) I was thanked by several for the complete explanations. That ended any reservations I had about burning server storage.

Then there is the other point that if it is on the server, a newer member might be able to find it. I know I have read some old discussions and learned some important things.

Matt (was this too long?)

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112479 is a reply to message #112438]

Thu, 20 January 2011 09:55

powerjon

Messages: 2446
Registered: January 2004

Karma: 5

Senior Member

Jim,
Might I suggest that you do your replies at a article in the GMCWS tech section. You could leave it open ended or do it as a blog on the GMCWS website. Good tech information is alway good and shame to waste.

JR Wright

On Jan 19, 2011, at 9:33 PM, James Hupy wrote:

> Everyone, I have had some of my posts kicked out for being too lengthy. If
> anyone wants information more than the brief? format I use, I would be happy
> to talk off net with anyone who asks. It is not an imposition on me and I
> take the role of GMCWS Tech VP seriously. I just don't want my lengthy posts
> to be a problem for all. If a summary format is info enough, you decide. If
> you want more indepth info, then we can go off net for personal attention. I
> feel a real sense of obligation to help out fellow GMCers any way I can.
> That is why I am on the black list, and help others by working on their
> coaches. I really don't know the meaning of the word retirement
> anyhow.<Grin>
> Jim Hupy
> Salem, Or
> 78 GMC Royale 403
>

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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112549 is a reply to message #112457]

Thu, 20 January 2011 21:11

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

G'day,

I reckon it boils down to who you want to understand what you're saying.

Obviously "talking" to someone with a high degree of mechanical or
electrical experience requires a lot fewer words.

Since there is a varying experience level of people that read the words of
wisdom posted here I think being a bit verbose is better than being too
brief.

I really appreciate being led by the hand when it comes to electrical
problems as I am REALLY electrically challenged!

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

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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

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Re: [GMCnet] Clearance 80mm Calipers When Installing Steel Wheels [message #112561 is a reply to message #112448]

Fri, 21 January 2011 03:49

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Procedure to verify sufficient clearance when installing 80mm calipers on
the front wheels of a GMC Motorhome equipped with 16" steel wheels or
vice-versa.

Note: It will be much easier to perform this check without a tire mounted on
the wheel!

1) Steel wheels MUST HAVE a domed center section as shown it the photo
below:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=33286

2) Grind boss off 80mm caliper as shown in photos below:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=19165

3) Push the caliper piston inwards until it is slightly below the cast iron
housing.

4) Install caliper on knuckle with new brake pads installed and pull it in
the outboard direction as far as it will go.

5) Center the caliper in one of the slots in the wheel and install the wheel
on the lower studs.

6) Start one lug nut on the lower studs being careful not to rotate the
wheel to keep the caliper centered in the wheel slot.

7) Push the top of the wheel inwards while keeping the caliper centered in
the wheel slot and watch the caliper for movement indicating it has come in
contact with the wheel.

8) Install a second lug nut 180 degrees opposite the one installed and
finger tighten them slowly until the wheel is hard up against the hub.

9) Pull the caliper outwards through the wheel window verifying it does not
contact the wheel.

10) Slowly rotate the wheel back and forth while looking through the slot
outboard of the caliper to determine the amount of clearance between the
wheel and the caliper. There should be an ABSOLUTE MINIMUM clearance of one
quarter inch (0.250) between the caliper and wheel with the wheel tightened
and hard up against the hub and the caliper as far out as it can go.

11) Rotate the wheel to the next slot and listen for evidence of the caliper
scraping the wheel.

12) Repeat step 10)

13) Rotate the wheel to the next two slots repeating step 10) and 11).

14) If the caliper contacts the wheel determine what part of the caliper is
contacting the wheel and if grinding sufficient material off the caliper to
establish the minimum clearance will not compromise its' strength or
function.

15) If grinding material off the caliper is not acceptable you can:

a) Fit spacers such as these:

http://www.appliedgmc.com/prod.itml/icOid/656

b) Fabricate spacers such as these:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=34643

Comment: It is likely that steel wheels removed from a truck will have seen
rough service and it would be advisable to make sure the wrecking yard will
allow you to bring them back if they're no good. When you get them home
check them as per the Maintenance Manual X-7525 Section 10 Wheels & Tires
page 10-8 thru 10-10. Also inspect the welds for cracking.

Composed by: Rob Mueller & Jim Hupy

Comments welcomed.

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

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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

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Re: Clearance 80mm Calipers When Installing Steel Wheels [message #112567 is a reply to message #112414]

Fri, 21 January 2011 07:45

RF_Burns

Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

When it comes to explaining how to do something, I believe its better to know the Why as well as the How.

I've had staff that insist on writing detailed notes as to what buttons to push to do a certain operation on the computer. They don't want to understand the program so they can understand how to do things... wayyy toooo technical. Soon they are back at my door hopelessly lost in the program.

I ask them "In recording directions to drive someplace, do you make detailed notes on how far to turn the steering wheel, and how much to press on the gas peddle and for how long before you hit the brakes?"

Doing that may get you there once, but one tiny error and you end up on someone's front lawn!

I look forward to the day when I have the time to make the detailed documentations many of the GMC'ers are noted for!

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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