Home » Public Forums » GMCnet » Rebuild or replace
| Rebuild or replace [message #317017] |
Wed, 03 May 2017 11:47  |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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The rescue coach had the air system disabled so first thing is to get the compressor on line. Motor seems to run fine on the bench but next to no pressure production. I know the Viair's are nice and do produce lots more cfm but I'm trying to keep the budget under control. Is rebuilding the existing Dana a good idea? Probably a $90-100 vs the $250 ish replacements. Any thoughts that might sway my thinking?
Thanks all, Hal
Oh yes, 1975 GMC upfitted, Power level system.
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
[Updated on: Wed, 03 May 2017 11:49] Report message to a moderator |
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| Re: Rebuild or replace [message #317023 is a reply to message #317017] |
Wed, 03 May 2017 12:57  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Hal StClair wrote on Wed, 03 May 2017 12:47The rescue coach had the air system disabled so first thing is to get the compressor on line. Motor seems to run fine on the bench but next to no pressure production. I know the Viair's are nice and do produce lots more cfm but I'm trying to keep the budget under control. Is rebuilding the existing Dana a good idea? Probably a $90-100 vs the $250 ish replacements. Any thoughts that might sway my thinking?
Thanks all, Hal
Oh yes, 1975 GMC upfitted, Power level system.
Hal,
As good as a Viair might be (no direct experience here), the rebuild of a Dana is just not an issue. It so straight forward that even if there were no included instructions, it would still be easy. I have done two (not the same one twice) and the are both still running well. I am pretty sure that they get killed be system leaks.
Matt Headed for the FMCA Cinci campground and then Bean Station
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: Rebuild or replace [message #317026 is a reply to message #317023] |
Wed, 03 May 2017 13:09 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Senior Member |
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I haven't pulled it apart but it does look to be a trivial matter to do so. The motor runs fine but only pumps up to about 60 psi with a gauge mounted directly to the head. I'm trying to keep the investment down on this build but need to be concerned as to the longevity of the repairs. It will probably have a life time warranty if you know what I mean but there are a LOT of things to work on....
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] Rebuild or replace [message #317030 is a reply to message #317026] |
Wed, 03 May 2017 13:35 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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The coaches have all the systems of an automobile, plus a few that cars
don't, and, in addition, they have all the systems that your home has, plus
a few. That adds up to a bunch of work. Anything that is worth doing, is
worth doing the best and finest job on, that we are capable of
accomplishing. Anything less than that, will mean that we will probably be
doing the job over, or that it will underperform our expectations. Not a
place I like to find myself, especially when it rears it's ugly head many
miles from home where I am unprepared to deal with it. That is the way I
try to approach working on my coach. You guys all have your priorities I am
sure. But remember, Murphy is always lurking out there, just waiting until
you leave the toolbox at home. He now has a female companion, you can hear
her mocking voice on the speaker of your navigation system. Don't know her
first name, but her last name is GARMIN. (Grin)
Jim Hupy (presently loading and preparing the coach for the Covered Bridge
rally this weekend.)
Salem, Or
78 ROYALE 403
On May 3, 2017 11:10 AM, "Hal StClair" wrote:
> I haven't pulled it apart but it does look to be a trivial matter to do
> so. The motor runs fine but only pumps up to about 60 psi with a gauge
> mounted
> directly to the head. I'm trying to keep the investment down on this build
> but need to be concerned as to the longevity of the repairs. It will
> probably have a life time warranty if you know what I mean but there are a
> LOT of things to work on....
> Hal
>
>
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1974 Eagle Bus 45',w/slideout
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Rebuild or replace [message #317032 is a reply to message #317030] |
Wed, 03 May 2017 14:02 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Hal,
I changed to a Viair 480C, happy as to how fast it fills from empty,
not happy with the loud (77db outside, 65db st driver seat) noise when running.
This is what happens when the cfs is increased by increasing rpm = NOISE.
Going to try to better reisolate the compressor unit, if not satisfied I'll rebuild the Dana.
Rebuild the Dana.
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: Rebuild or replace [message #317035 is a reply to message #317017] |
Wed, 03 May 2017 14:30 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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The overall air quantity requirements of the suspension system is very small. The real requirement is having a compressor that will develop the required pressure which is usually around 120 PSI. The OEM Dana is more than capable of providing what is needed.
About 15 years ago John Clement ran Dana rebuild seminars at the GMCMI rallys. He would test your motor and compressor and see if it would come up to pressure in a given amount of time. If it did not, you would sit down at the provided table and rebuild it on the spot. He had all of the parts available. It took less than 1 hour to rebuild and test your compressor again. I rebuilt mine at one of these seminars about 15 tears ago, reinstalled it, and forgot about even since. It is back there, runs automatically when needed, and I do not need to worry about it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Rebuild or replace [message #317057 is a reply to message #317035] |
Thu, 04 May 2017 00:09 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Senior Member |
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Maybe the life time warranty is a little exagerated. If it could last 15 years I'm sure my daughter would give me a pass (if I'm still around then)  .
I do TRY to do things the best I can the first time around but I really don't have the finances for this give away project. I'm really hoping her family is going to enjoy the GMC but there is no guarantee they will or that it won't sit unused for years. I want it to be safe and dependable of course but at a price point I can afford. I know it will be a tough balancing act to accomplish. If I can save $150 on a compressor and have one that still functions well, I'm all in.
Thank all of you for your input. You've swayed me to rebuilding the one I have.
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: Rebuild or replace [message #317058 is a reply to message #317057] |
Thu, 04 May 2017 01:20 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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When you reassemble it remember to set the cog belt to time the two pistons 180 degrees from each other. When one piston is at the top the other is all the way at the bottom.
I'm not sure what Jim supplies in that kit. I only did mine once many years ago
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Rebuild or replace [message #317069 is a reply to message #317057] |
Thu, 04 May 2017 10:00 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Hal,
About 20 years ago I had a Dana that had kind of eaten up the cylinder
walls. I made a tool to replace the cylinder sleeves. When I showed
it to John Clement, He wanted one. So I fixed him up with one. So, If you
have the complete compressor, it's possible to make it like new.
The biggest problem with the Dana compressor is the round felt filter in the
back. They disintegrate over time and get sucked into the
compressor with obvious bad results. John now has filters made with a
synthetic material that he says has cured the problem. I would
make sure the kit you get has the new filter or else get some from John. I
wish some one else would take up saving these old compressors.
John is getting quite old and no one else seems to be taking over his
business. The same problem we have with so many things.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Hal StClair"
Sent: Thursday, May 04, 2017 1:09 AM
To:
Subject: Re: [GMCnet] Rebuild or replace
> Maybe the life time warranty is a little exagerated. If it could last 15
> years I'm sure my daughter would give me a pass (if I'm still around then)
> :p
> .
> I do TRY to do things the best I can the first time around but I really
> don't have the finances for this give away project. I'm really hoping her
> family is going to enjoy the GMC but there is no guarantee they will or
> that it won't sit unused for years. I want it to be safe and dependable
> of
> course but at a price point I can afford. I know it will be a tough
> balancing act to accomplish. If I can save $150 on a compressor and have
> one that
> still functions well, I'm all in.
> Thank all of you for your input. You've swayed me to rebuilding the one I
> have.
> Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1975 Eleganza II, 101230
>
> 1974 Eagle Bus 45',w/slideout
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Rebuild or replace [message #317097 is a reply to message #317078] |
Thu, 04 May 2017 18:45 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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I got mine at Applied Technology which used to be known as Bearings Inc.
It's just a 1" ID oilite bronze sleeve IIRC.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "A."
Sent: Thursday, May 04, 2017 12:12 PM
To:
Subject: Re: [GMCnet] Rebuild or replace
> Kosier wrote on Thu, 04 May 2017 10:00
>> Hal,
>> About 20 years ago I had a Dana that had kind of eaten up the cylinder
>> walls. I made a tool to replace the cylinder sleeves. When I showed it
>> to
>> John Clement, He wanted one. So I fixed him up with one. So, If you
>> have the complete compressor, it's possible to make it like new.
>> The biggest problem with the Dana compressor is the round felt filter in
>> the back. They disintegrate over time and get sucked into the compressor
>> with obvious bad results. John now has filters made with a synthetic
>> material that he says has cured the problem. I would make sure the kit
>> you
>> get has the new filter or else get some from John. I wish some one else
>> would take up saving these old compressors.
>> John is getting quite old and no one else seems to be taking over his
>> business. The same problem we have with so many things.
>>
>> Gary Kosier
>> 77PB w/500Cad
>> Newark, Ohio
> Where do you get replacement sleeves?
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Every day I become more convinced that I am the only person left on the
> planet that recognizes nonsense for what it is."
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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