thermostats |
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sean
Moderator Group Sponsor Member Joined: 20 July 2005 Location: North Idaho Status: Offline Points: 7388 |
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Posted: 07 June 2007 at 11:17pm |
These are not "genuine Willys" parts, but are vintage period service parts, representative of the type used in CJ2A.
These are old school bellows type thermostats. The bellows is filled with some kind of liquid or gas (still unknown for sure) that expands w/temperature, opening the thermostat valve. From left to right:
Modern thermostats are a wax-pellet type. A wax pellet is contained w/in a copper slug, operating against a fixed rod, much like a hydraulic cylinder. The thermostat valve is fixed to the slug. When the wax expands w/temperature, the slug pulls the valve open. At cold temps, the valve is forced closed by the external spring. There are technical differences between the two types that may be worth considering. YMMV. 1) Valve opening size. Both types use a circular valve, which when open creates a cylindrical passage.
Which one allows more coolant to flow through the radiator? Specially at the relatively low operating pressure (4 PSI) of the L-head, compared to the higher pressures (10-15 PSI) in cars that modern thermostats are designed for. In lieu of the bellows type, it might be worth trying to find a modern type w/large valve, which has about the same passage area as a bellows: 2) Exposure to coolant. The L-head thermostat housing was designed for a bellows thermostat.
3) Failure mode. While both types are quite reliable, if they do fail ......
Sean Edited by sean - 28 Dec. 2010 at 2:56pm |
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Brachus12
Member Joined: 04 Jan. 2007 Location: Upstate, SC Status: Offline Points: 738 |
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Here's another Harrison that I picked up off eBay.
Harrison #3122283 - 160deg, 1950 vintage, fits "Willys 1937-1950 ALL". |
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47 CJ2A #101361 "Bugger"
42 GPW 75248 SPEN Trailer 62 M170 13758 http://s4.photobucket.com/albums/y119/brachus/Willys |
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willys54wagon
Member Joined: 24 July 2008 Location: Ames, IA Status: Offline Points: 1444 |
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Gents,
I have the 3 bolt thermostat housing which is designed for the bellows thermostat. Bubba used a tin can to hold the thermostat up to the top of the housing. Seemed to have worked but wondered what others are using for the spaceer. What would be the names for items 8, 9, 10? 9 obviously being the housing , 8 thermostat and 10? Notes above refer to a disadvantage of the thermostat being up in the housing and that the new ones fail closed. Is it possible a spring was used to keep the new style thermostat in place and provide a release if it failed closed? A final note that NAPA does not carry a gasket for this but sells gasket material to cut your own. Not a big deal, just interesting.
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Two jeeps on the road, one is close and the rest are dreams.
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willys54wagon
Member Joined: 24 July 2008 Location: Ames, IA Status: Offline Points: 1444 |
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Is this the part I am looking for to fit in the housing to hold the thermostat up? http://www.autopartswarehouse.com/details/QQJeepQQWillysQQOmixQQThermostat_HousingQQ19461956QQO321710701.htmlIf so looks like it would work to place the thermostate closer to block or up in the housing. Is one better than the other?
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Two jeeps on the road, one is close and the rest are dreams.
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willys54wagon
Member Joined: 24 July 2008 Location: Ames, IA Status: Offline Points: 1444 |
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Ok, now I see it at Walcks for $5.20 a much cheaper price. http://walcks4wd.com/catalogsearch/result/?q=thermostat
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Two jeeps on the road, one is close and the rest are dreams.
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