| [GMCnet] Air compressor inlet [message #75685] |
Thu, 04 March 2010 20:34  |
Gary Casey
Messages: 448
Registered: September 2009
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Okay, I'll admit to being a total amateur when it comes to this coach, but there is a "situation" that totally puzzles me. I have a "V-twin" air compressor, apparently not the original as the bracket doesn't seem to be standard. Each cylinder is T-d into a plastic output line like I would expect. But there is a rubber hose that is also T'd and goes to each cylinder - the inlet or suction line - makes sense. It makes sense until I follow it into the coach under the dash where it goes to the transmission kick-down switch and plugs onto the lever which is pushed by the throttle lever. What?? That makes no sense at all. I suppose it might to into the coach to get clean air, but plugged into the kickdown switch?? No, I'm not delirious and mistaking it for the cruise control vacuum break - that's there and intact even though the original cruise control is long since gone. If the compressor intake does indeed go inside I would expect it to end in some
sort of filter or muffler. I think I now know why it took so long to pump up - it was starved for air.
Just to prove I'm not nuts, I do know which direction the engine turns....I think :-)
Gary Casey
'73 '23
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| Re: [GMCnet] Air compressor inlet [message #75688 is a reply to message #75685] |
Thu, 04 March 2010 20:50  |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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| Gary Casey wrote on Thu, 04 March 2010 18:34 |
Okay, I'll admit to being a total amateur when it comes to this coach, but there is a "situation" that totally puzzles me. I have a "V-twin" air compressor, apparently not the original as the bracket doesn't seem to be standard. Each cylinder is T-d into a plastic output line like I would expect. But there is a rubber hose that is also T'd and goes to each cylinder - the inlet or suction line - makes sense. It makes sense until I follow it into the coach under the dash where it goes to the transmission kick-down switch and plugs onto the lever which is pushed by the throttle lever. What?? That makes no sense at all. I suppose it might to into the coach to get clean air, but plugged into the kickdown switch?? No, I'm not delirious and mistaking it for the cruise control vacuum break - that's there and intact even though the original cruise control is long since gone. If the compressor intake does indeed go inside I would expect it to end in some
sort of filter or muffler. I think I now know why it took so long to pump up - it was starved for air.
Just to prove I'm not nuts, I do know which direction the engine turns....I think 
Gary Casey
'73 '23
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As I recall, mine went inside and had some kind of a screen over it, to keep the bugs out and to give somewhat clean air and no water from under the hood. My guess is that some PO found it and thought it had to connect to something, and looked around and....
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] Air compressor inlet [message #75707 is a reply to message #75685] |
Fri, 05 March 2010 03:57 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| Gary Casey wrote on Thu, 04 March 2010 18:34 |
... It makes sense until I follow it into the coach under the dash where it goes to the transmission kick-down switch and plugs onto the lever which is pushed by the throttle lever. What?? That makes no sense at all. I suppose it might to into the coach to get clean air, but plugged into the kickdown switch?? ...
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Your coach has 37 years for things to have been "changed."
With my '73, I think a PO (or more likely, one of the fantastic mechanics he used) thought the pump intake hose was a vacuum leak. How do you fix vacuum leaks? A properly sized bolt of course!
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Air compressor inlet [message #75708 is a reply to message #75685] |
Fri, 05 March 2010 05:50 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Gary,
I think someone forgot to look in the manual before he or she started
finding places to plug stuff into. Your thoughts are correct. The
line goes into the coach to pick up less contaminated air for the
compressor. I bet your cruise control doesn't work very well, if at
all.
On Thu, Mar 4, 2010 at 7:34 PM, Gary Casey <casey.gary@yahoo.com> wrote:
> Okay, I'll admit to being a total amateur when it comes to this coach, but there is a "situation" that totally puzzles me. I have a "V-twin" air compressor, apparently not the original as the bracket doesn't seem to be standard. Each cylinder is T-d into a plastic output line like I would expect. But there is a rubber hose that is also T'd and goes to each cylinder - the inlet or suction line - makes sense. It makes sense until I follow it into the coach under the dash where it goes to the transmission kick-down switch and plugs onto the lever which is pushed by the throttle lever. What?? That makes no sense at all. I suppose it might to into the coach to get clean air, but plugged into the kickdown switch?? No, I'm not delirious and mistaking it for the cruise control vacuum break - that's there and intact even though the original cruise control is long since gone. If the compressor intake does indeed go inside I would expect it to end in some
> sort of filter or muffler. I think I now know why it took so long to pump up - it was starved for air.
>
> Just to prove I'm not nuts, I do know which direction the engine turns....I think :-)
>
> Gary Casey
> '73 '23
>
>
>
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Air compressor inlet [message #75712 is a reply to message #75685] |
Fri, 05 March 2010 07:11 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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On Mar 4, 2010, at 9:34 PM, Gary Casey wrote:
> Okay, I'll admit to being a total amateur when it comes to this
> coach, but there is a "situation" that totally puzzles me. I have a
> "V-twin" air compressor, apparently not the original as the bracket
> doesn't seem to be standard. Each cylinder is T-d into a plastic
> output line like I would expect. But there is a rubber hose that is
> also T'd and goes to each cylinder - the inlet or suction line -
> makes sense. It makes sense until I follow it into the coach under
> the dash where it goes to the transmission kick-down switch and
> plugs onto the lever which is pushed by the throttle lever. What??
> That makes no sense at all. I suppose it might to into the coach to
> get clean air, but plugged into the kickdown switch?? No, I'm not
> delirious and mistaking it for the cruise control vacuum break -
> that's there and intact even though the original cruise control is
> long since gone. If the compressor intake does indeed go inside I
> would expect it to end in some
> sort of filter or muffler. I think I now know why it took so long
> to pump up - it was starved for air.
>
> Just to prove I'm not nuts, I do know which direction the engine
> turns....I think :-)
>
> Gary Casey
> '73 '23
>
Gary
The inlet to your compressor did go into the area below the dash just
so that it would not draw dust and dirt from the road. It was not
connected to anything by the factory. So I can only conclude that
some prior owner didn't know what it was for and plugged it into the
kickdown switch by error.
Just connect it and let it dangle under the dash connected to nothing.
Emery Stora
77 Kingsley
Santa Fe, NM
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