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[GMCnet] It was the thermostat [message #272871]

Mon, 02 March 2015 14:12

glwgmc

Messages: 1014
Registered: June 2004

Karma:

Senior Member

A short time ago I posted about an over cooling issue I was having with the new engine in the Clasco and how the plastic fan and fan clutch combo kept the fan clutch locked up when it should not be. We just returned from Eugene where Sharon had surgery on the lids around her eyes (successfully!) and this morning had time to instal a new Robert Shaw 195 thermostat to replace the 180 which went in with the engine R&R. That one change seemed to make all the symptoms go away. The standard duty fan clutch engaged at start up like it should, then quickly released after a mile or so. The water temp went to 195 and stayed there like it was painted on. I drove over the 1000 foot climb going south from where our building is located up to the tunnel near the top of the mountain that separates the Oregon from the California water sheds. The water temp moved only a tiny bit and never saw 200. The fan clutch never engaged. Coming back down was the same story. Water temp sat right
at 195 and the fan clutch and plastic fan behaved as they should. No belt squeaking.

When I measured the 180 thermostat it appeared to open early (down in the high 160 to low 170 range) and was fully open by 185 and fully closed again about 165. This same standard duty fan clutch and plastic fan combination with that thermostat locked on and never did sound like it fully released. So, all I can surmise at this point is that the combo of the aluminum radiator, plastic fan and a early opening thermostat kept the air temp coming through the radiator so low that the fan clutch never did properly distribute the torque fluid and kept the fan engaged when it shouldn't. Hence, I recommend not using a 180 with this combination.

The standard duty fan clutch is supposed to run the fan at 20% to 30% when disengaged and 60 to 70% when engaged. From this short experiment it seems like the plastic fan flows enough air even at 20 to 30% of crank speed to keep the engine heat well modulated. I will report more when the temperatures get into the 90s and low 100s if there is any change. The standard duty fan clutch is supposed to be for fans with a 1 1/2" pitch where our original steel fan and the plastic fan are both 2 1/4" pitch which would suggest the heavy duty fan clutch (designed for 2 1/2" pitch fans, 25-35% off, 70-90% on) might be a closer match so I will keep an eye on things through the spring and into summer. Thanks for all your constructive comments and suggestions.

Jerry

Jerry & Sharon Work
Kerby, OR
http://jerrywork.com
78 Royale
77/94 Clasco

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Jerry & Sharon Work
78 Royale
Kerby, OR

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[Message index]

		[GMCnet] It was the thermostat By: glwgmc on Mon, 02 March 2015 14:12
		Re: [GMCnet] It was the thermostat By: ljdavick on Mon, 02 March 2015 14:40
		Re: [GMCnet] It was the thermostat By: JohnL455 on Mon, 02 March 2015 19:28
		Re: [GMCnet] It was the thermostat By: George Beckman on Tue, 03 March 2015 23:13
		Re: [GMCnet] It was the thermostat By: John Biwersi on Mon, 02 March 2015 20:46
		Re: [GMCnet] It was the thermostat By: Ken Burton on Mon, 02 March 2015 22:05
		Re: [GMCnet] It was the thermostat By: JohnL455 on Tue, 03 March 2015 08:44
		Re: [GMCnet] It was the thermostat By: hal kading on Tue, 03 March 2015 12:23
		Re: [GMCnet] It was the thermostat By: USAussie on Tue, 03 March 2015 22:38
		Re: [GMCnet] It was the thermostat By: A Hamilto on Tue, 03 March 2015 23:04
		Re: [GMCnet] It was the thermostat By: emerystora on Tue, 03 March 2015 23:14
		Re: [GMCnet] It was the thermostat By: USAussie on Wed, 04 March 2015 08:41
		Re: [GMCnet] It was the thermostat By: George Beckman on Wed, 04 March 2015 10:30
		Re: [GMCnet] It was the thermostat By: George Beckman on Wed, 04 March 2015 11:00
		Re: [GMCnet] It was the thermostat By: emerystora on Wed, 04 March 2015 11:16
		Re: [GMCnet] It was the thermostat By: George Beckman on Wed, 04 March 2015 11:48
		Re: [GMCnet] It was the thermostat By: emerystora on Wed, 04 March 2015 12:14
		Re: [GMCnet] It was the thermostat By: Matt Colie on Wed, 04 March 2015 19:09
		Re: [GMCnet] It was the thermostat By: A Hamilto on Wed, 04 March 2015 22:06
		Re: [GMCnet] It was the thermostat By: Matt Colie on Thu, 05 March 2015 09:08
		Re: [GMCnet] It was the thermostat By: A Hamilto on Thu, 05 March 2015 11:26
		Re: [GMCnet] It was the thermostat By: Matt Colie on Thu, 05 March 2015 15:45
		Re: [GMCnet] It was the thermostat By: James Hupy on Thu, 05 March 2015 16:06
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 17:39
		Re: [GMCnet] It was the thermostat By: Matt Colie on Sat, 07 March 2015 19:24
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 19:31
		Re: [GMCnet] It was the thermostat By: James Hupy on Sat, 07 March 2015 19:55
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 20:24
		Re: [GMCnet] It was the thermostat By: Bob de Kruyff on Thu, 05 March 2015 14:13
		Re: [GMCnet] It was the thermostat By: A Hamilto on Thu, 12 March 2015 11:52
		Re: [GMCnet] It was the thermostat By: A Hamilto on Wed, 04 March 2015 11:32
		Re: [GMCnet] It was the thermostat By: A Hamilto on Wed, 04 March 2015 12:19
		Re: [GMCnet] It was the thermostat By: emerystora on Wed, 04 March 2015 12:54
		Re: [GMCnet] It was the thermostat By: A Hamilto on Wed, 04 March 2015 14:32
		Re: [GMCnet] It was the thermostat By: James Hupy on Wed, 04 March 2015 14:58
		[GMCnet] orifice By: Brian Waddell on Thu, 12 March 2015 16:52
		Re: [GMCnet] orifice By: Dennis S on Thu, 12 March 2015 17:47
		Re: [GMCnet] orifice By: USAussie on Thu, 12 March 2015 17:50
		Re: [GMCnet] orifice By: Brian Waddell on Thu, 12 March 2015 18:27
		Re: [GMCnet] orifice By: emerystora on Thu, 12 March 2015 18:30
		Re: [GMCnet] orifice By: Brian Waddell on Thu, 12 March 2015 18:52
		Re: [GMCnet] orifice By: USAussie on Thu, 12 March 2015 21:22
		Re: [GMCnet] orifice By: Bob de Kruyff on Thu, 12 March 2015 21:31
		Re: [GMCnet] orifice By: Dennis S on Thu, 12 March 2015 21:42
		Re: [GMCnet] orifice By: emerystora on Thu, 12 March 2015 21:54
		Re: [GMCnet] orifice By: Carl S. on Thu, 12 March 2015 22:04
		Re: [GMCnet] orifice By: Bob de Kruyff on Fri, 13 March 2015 09:37
		Re: [GMCnet] orifice By: George Beckman on Thu, 12 March 2015 23:59
		Re: [GMCnet] orifice By: midlf on Fri, 13 March 2015 03:55
		Re: [GMCnet] orifice By: USAussie on Fri, 13 March 2015 07:55
		[GMCnet] re re re orifice....steering By: Brian Waddell on Mon, 16 March 2015 20:44
		Re: [GMCnet] orifice By: Carl S. on Thu, 12 March 2015 21:19
		Re: [GMCnet] It was the thermostat By: Bullitthead on Tue, 03 March 2015 23:23
		Re: [GMCnet] It was the thermostat By: Bullitthead on Tue, 03 March 2015 23:34
		Re: [GMCnet] It was the thermostat By: Bob de Kruyff on Wed, 04 March 2015 18:52
		Re: [GMCnet] It was the thermostat By: Michael Leipold on Wed, 04 March 2015 11:47
		Re: [GMCnet] It was the thermostat By: George Beckman on Wed, 04 March 2015 12:01
		Re: [GMCnet] It was the thermostat By: emerystora on Wed, 04 March 2015 12:20
		Re: [GMCnet] It was the thermostat By: JohnL455 on Wed, 04 March 2015 19:59
		Re: [GMCnet] It was the thermostat By: Bullitthead on Wed, 04 March 2015 23:04
		Re: [GMCnet] It was the thermostat By: emerystora on Thu, 05 March 2015 11:28
		Re: [GMCnet] It was the thermostat By: Matt Colie on Thu, 05 March 2015 15:13
		Re: [GMCnet] It was the thermostat By: JohnL455 on Thu, 05 March 2015 08:28
		Re: [GMCnet] It was the thermostat By: jhbridges on Thu, 05 March 2015 09:03
		Re: [GMCnet] It was the thermostat By: jhbridges on Thu, 05 March 2015 16:29
		Re: [GMCnet] It was the thermostat By: Matt Colie on Fri, 06 March 2015 07:10
		Re: [GMCnet] It was the thermostat By: jhbridges on Fri, 06 March 2015 08:36
		Re: [GMCnet] It was the thermostat By: JohnL455 on Fri, 06 March 2015 08:38
		Re: [GMCnet] It was the thermostat By: Bullitthead on Fri, 06 March 2015 20:43
		Re: [GMCnet] It was the thermostat By: Bullitthead on Fri, 06 March 2015 21:01
		Re: [GMCnet] It was the thermostat By: USAussie on Fri, 06 March 2015 22:59
		Re: [GMCnet] It was the thermostat By: Bullitthead on Fri, 06 March 2015 23:39
		Re: [GMCnet] It was the thermostat By: Bullitthead on Fri, 06 March 2015 23:51
		Re: [GMCnet] It was the thermostat By: Bullitthead on Sat, 07 March 2015 08:23
		Re: [GMCnet] It was the thermostat By: USAussie on Sat, 07 March 2015 08:32
		Re: [GMCnet] It was the thermostat By: Bullitthead on Sat, 07 March 2015 09:40
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 17:15
		Re: [GMCnet] It was the thermostat By: Bullitthead on Sat, 07 March 2015 18:12
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 19:20
		Re: [GMCnet] It was the thermostat By: Bullitthead on Sat, 07 March 2015 19:53
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 20:30
		Re: [GMCnet] It was the thermostat By: Bullitthead on Sat, 07 March 2015 21:24
		Re: [GMCnet] It was the thermostat By: A Hamilto on Sat, 07 March 2015 22:44
		Re: [GMCnet] It was the thermostat By: USAussie on Sat, 07 March 2015 22:51
		Re: [GMCnet] It was the thermostat By: jhbridges on Fri, 06 March 2015 08:48
		Re: [GMCnet] It was the thermostat By: emerystora on Fri, 06 March 2015 10:51
		Re: [GMCnet] It was the thermostat By: JohnL455 on Fri, 06 March 2015 21:07
		Re: [GMCnet] It was the thermostat By: Bullitthead on Fri, 06 March 2015 21:20
		Re: [GMCnet] It was the thermostat By: jhbridges on Sat, 07 March 2015 09:09
		Re: [GMCnet] It was the thermostat By: JohnL455 on Sat, 07 March 2015 11:24

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