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11-23-2013, 03:42 PM
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#1 |
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Senior Member
 
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Air Shut-Off Damper ?
Does anyone have a good picture of the air shut-off damper that goes in the cowl on A/C trucks ? I'm looking for how the spring loaded pin goes into the firewall. There's a hole about 1/2" and the spring loaded pin is about 1/8. I have the plastic piece that goes on the engine bay side, but there must be something that goes on the other side, a bushing or something ?
Gary
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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11-23-2013, 03:53 PM
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#2 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Re: Air Shut-Off Damper ?
I found this picture, and it looks like there is a bushing inside the cowl where the pin goes.
Where can I get one of these ? Gary
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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11-23-2013, 05:55 PM
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#3 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Re: Air Shut-Off Damper ?
This pic has the part I'm looking for circled
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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11-24-2013, 09:26 AM
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#4 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Re: Air Shut-Off Damper ?
Anyone ? Anyone have a picture so I could make one ?
Gary
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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11-24-2013, 10:26 AM
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#5 |
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1972 K20
Join Date: Apr 2008
Location: Greenfield MN
Posts: 360
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Re: Air Shut-Off Damper ?
I think LMC sells that part. If not try one of the many 67-72 vendors or if you're OK with a used used one try the parts board. Even another option is to make one. Pretty simple flanged bushing made from plastic. I had a hard time finding the plastic one on the firewall so I bouight a used one. Good luck!
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11-24-2013, 10:36 AM
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#6 |
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1972 K20
Join Date: Apr 2008
Location: Greenfield MN
Posts: 360
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Re: Air Shut-Off Damper ?
I just checked LMC and they do not sell the plastic parts for the AC flapper valve.
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11-24-2013, 11:06 AM
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#7 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Air Shut-Off Damper ?
The parts book calls number 4 a BEARING #3895487 and number 3 a CAP #3895486
That's all I got at the moment.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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11-24-2013, 12:15 PM
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#8 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Re: Air Shut-Off Damper ?
So far I haven't been able to find one either used or after market. So I guess I'll have to make one ! I'll measure the hole and the spring pin diameters and make one from Teflon or nylon, something like that.
Gary
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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11-25-2013, 12:06 PM
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#9 |
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Registered User
Join Date: Oct 2009
Location: Phoenix, AZ
Posts: 475
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Re: Air Shut-Off Damper ?
I ended up making one from a nylon bolt from Ace Hardware. Quick and cheap.
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1971 C10 Longbed, 350/TH350 |
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11-27-2013, 12:13 PM
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#10 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Re: Air Shut-Off Damper ?
Well I tried using a plastic fitting but it broke, so I used a brass fitting and machined the hole over sized and left a shoulder on the inside and inserted a piece of nylon tube as the bearing.
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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11-27-2013, 12:21 PM
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#11 |
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Senior Member
Join Date: May 2003
Location: Sandown, NH
Posts: 2,820
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Re: Air Shut-Off Damper ?
One more with the damper installed.
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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Yesterday, 11:35 AM
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#12 |
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Senior Member
Join Date: Sep 2011
Location: Owosso, Michigan
Posts: 2,857
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Re: Air Shut-Off Damper ?
Before I too machine one does anyone know of a source for a correct oem nylon bushing?
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1967 C10 SWB Owner - Rustbelt Restorations |
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Yesterday, 01:21 PM
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#13 |
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Senior Member
Join Date: Feb 2022
Location: Ca
Posts: 537
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Re: Air Shut-Off Damper ?
I can not fine any. I need the front one on the firewall. My back one is OK shape, but front is burnt up bad.
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Today, 11:35 AM
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#14 |
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Senior Member
 Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,721
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Re: Air Shut-Off Damper ?
Sorry to our knowledge neither nylon bushing is reproduced. Anyone with a 3D printer. Brass fitting idea was ingenious in my opinion kudos for thinking outside of the box.
Paul Jr @ GMCPauls |
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Today, 12:58 PM
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#15 |
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Senior Member
Join Date: Feb 2022
Location: Ca
Posts: 537
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Re: Air Shut-Off Damper ?
Paul
I will have a big order for you pretty soon. Guess I'll have to make one of stock. I don't have access to 3d printer. Thanks for input. |
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Today, 03:04 PM
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#16 |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 537
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Re: Air Shut-Off Damper ?
Might check the Hillman drawers at one of the big hw stores or McMaster Carr for a nylon "hat", seems like a common type of uncommon item
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1970 C10 Custom longbed 350/350 |
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