| Re: [GMCnet] Fan clutch follies [message #272477 is a reply to message #272438] |
Sun, 22 February 2015 20:26   |
powwerjon
Messages: 849
Registered: March 2013
Karma:
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Senior Member |
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Chris,
I went back and reread you first email and at the end you say that you have "summer cooling issues”. You also state that you have a Black Magic electric fan, what is the model number and size? Electric fans over the years have had limited success when used on the GMC coach. Your electric fan housing is most likely restricting the air flow thru your radiator and that becomes more noticeable when your weather gets warmer. Your signature line doesn’t say what part of the country you live.
I am going to offer my personal suggestions on what I would do having learned over the past 15 + years with the GMC coach, and trying many different setups, others may vary and you need to do what is best for you:
NOTHING move more air thru the GMC radiator more than the factory cooling set up. Yours is a 76 coach and came with the shroud, venturi ring and venturi seal that was bulky and harder to work with than the shrouds that were on the 77 and 78 coaches. I would lose the electric fan and install the new split shroud as that will make it easier for future work on the front of the engine and it lines up on the fan better. The 7 blade fan is good if that is what you want to use and until this past fall all I have used, but I am now using the John B. Nylon 10 blade fan. The biggest observation that I have noticed with the new nylon fan is the reduced fan noise as compared to the stock fan using the same fan clutch (2400miles). I presently use a 2747 clone sold by AutoZone under part#922747. Excuse the other part number as I fat fingered too many 2’s. It is a good medium duty fan clutch and with the new fan I can barely hear it engage. I have used the 2797 severe duty fan clutch on and off and it can be noisy when it engages but the 2747 should work just fine. When they discontinued the 455 and start using the 403 in the 1977 coaches starting at TZE167V101285 for the motorhome, TZE337V101287 for the 23’ TransMode and TZE367V101312 for the 26” TransMode. At the same time GMC added the baffles to control the air flow thru the radiator. See the following:
OEM baffles here:
http://www.gmcmhphotos.com/photos/miscellaneous-bryant-stuff/p31392-baffle.html
http://www.gmcmhphotos.com/photos/miscellaneous-bryant-stuff/p31393-baffle.html
--
Bill Bryant
In 2002 I added and front spoiler which I designed and built and still do.
http://www.gmcmhphotos.com/photos/g3358-front-air-dam-spoiler.html
and
http://www.appliedgmc.com/prod.itml/icOid/1019
and
JR Wrights Air Spoiler Dam
My 77 Eleganza II with a 180 thermostat and the air control package never got over a few degrees above 180 deg even when the temp was in the 90’s+ at 64 MPH and towing a 4dr Tracker. It ran that way till the day I sold it. Never got hot!
Again these are my observations and mods that I used over the years that worked well for me. You have to make a choice on which direction that you want to go in, I wish you luck!
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan
On Location in Tucson
> On Feb 22, 2015, at 5:05 AM, Chris Tyler wrote:
>
> [quote title=powwerjon wrote on Thu, 19 February 2015 22:25]Chris,
> If your missing the fan shroud your at a disadvantage to have correct cooling, especially in hot weather. Just adding the shroud will greatly enhance
> your cooling. I am going to make a personal suggestion for the fan clutch. I would suggest the AZ 9222747, it is a medium duty fan and I find it
> works well without excessive noise.
>
> J.R. Wright
>
> The PO removed the original shroud and placed a black magic electric fan, retaining the stock fan with a HD clutch that works. Although I have the
> original shroud I have a 2 piece FG one from Jim K. I would like to keep the electric fan but will need to modify the mount to retain it.
>
> THE AZ on your part number...is that Autozone?
> --
> 76 Glenbrook
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