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62bigwindow
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Group: Forum Members
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The stock sender is in place. I put a mechanical gauge in because the factory gauge doesn't work. I have a replacement now so maybe it will be more honest about the temp.
Durham Missouri
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CK
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Last Active: 9 Years Ago
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It could be the new gauge or was it in before you changed the radiator?
Maybe you need to alter the pump pulley size to slow it down?
I read it should run between 180-210*
I have the gauge at the rear head port and a radiator cap with a gauge and they both read the same.
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2721955meteor
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charliemccraney (9/3/2016)
The water pump is the worst place for a temperature sender. The coolant is just coming out of the radiator so at best, you will get a reading that is a few degrees higher than the cooled coolant coming out of the radiator. The coolant still has to pass by 8 cylinders and over 8 combustion chambers. From that perspective, it is no surprise that you are getting a lower than expected reading. The best place to check the temperature is right behind the thermostat, on the intake. If the device you use to measure is known to be accurate and it is only 170 there and and does not get hotter, then your thermostat is defective or perhaps is was mispackaged, or maybe it is a 160 and poor eyes made it look like 180. The thermostat is opening.The engine simply will not stay cool if the thermostat does not open. You should see the temperature increase as you measure along the flow of the coolant. The pump will be coolest, the middle of the block will be warmer, the stock sender location will be warmer, the thermostat will be hottest. Do you see that? corection,withe the by pass working in the right situation(cold weather)the engine will not over heat stat closed
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CK
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oldcarmark
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My experience with the Robertshaw Thermostat was similar to Yours. I tried 2 of them thinking the first was defective. Neither One would get the Engine warmed up in reasonable Time. Went back to a standard 160 Stat and it worked as its supposed to. Never figured out why the Robertshaw Stat didn't work properly. maybe both were defective? I also installed a mechanical Coolant Temp. Gauge. Drilled and tapped the Intake Manifold just behind Stat Housing to the left on the flat area of Manifold. I also have the original Temp Gauge operating.
 
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charliemccraney
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2721955meteor (9/11/2016)
corection,withe the by pass working in the right situation(cold weather)the engine will not over heat stat closed If the thermostat stays closed, the engine will not stay cool, no matter the weather. The bypass only recirculates coolant through the engine, bypassing the radiator. This means that the coolant can only absorb heat. If it cannot transfer that heat to the air via the radiator, it will overheat. The engine block and heads will not be able to transfer that heat effectively enough to stay cool without the radiator. I haven't had any problem with American made Robert Shaw style thermostats. I did have a Mr Gasket (Chinese) fail prematurely. I never thought either took longer to warm up.
Lawrenceville, GA
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oldcarmark
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The 2 I tried were Mr. Gasket. Did not realize there was a difference. Maybe thats why they failed.
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62bigwindow
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The thermo works. I tested in in a pan of water before I put it in service. It is possible that it's a 160° instead of a 180°. It was a NOS unit that did not have the original box. I'm sure my gauge is reading correctly. It is within 10° of the readings I get with the infared gun. I just had the car out tonight and the temp never rose above 160. I think I'll try to find a 180 and swap them out and see what happens.
Durham Missouri
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GREENBIRD56
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My trusty old '56 Ford manual (right or wrong) shows the OEM thermostat spec - "standard" = 157-162. So a new NOS could be just that. The engine tuning - standard equipment - had a number of features that facilitate warm up. One is the "no vacuum advance" at idle and retarded initial timing settings. When using other tuning schemes - the engines may run quite a bit cooler at idle than the OEM - but warmed up and running, it should get to the t-stat rating as a minimum. NAPA used to have a conventional 170 degree, 2 inch thermostat with the larger size (1-1/2"?) opening but I've lost track of the part number. Is it still available?
Steve Metzger Tucson, Arizona
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2721955meteor
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for what its worth, charley in correct, i don't by the pressurcap storey,pressure in the system stops water from boiling,boiling water causes cavitation hot spots in the engine,so some pressure is important. cavitation will give false readings on gauge.(that is why bypass hose is critical so pump keeps flow in engine when stat is closed. my ranchero runs 160 at ford temp location and170 at therm housing.little to no flow to rad till 170 at stat when it opens. yes i need a new stat to keep temp close to 180.
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