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EFV-8 Club Forum / General Ford Discussion / Skips pressure vaves

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Discussion Topic: Skips pressure vaves

FFracer

02-03-2013 @ 11:42 AM

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hey all,
I bought a couple of these valves and they worked great I do however have a question after I got home car sat about 1/2 hour opened hood and both radiator hoses were collapsed. Don't these valves release the accumulated vacuum that occurs on cool down?? I thought maybe I put it on backwards but I cannot blow or suck air through the valve.

Thanks,
Chris
33 Cabriolet

02-04-2013 @ 7:40 AM

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I have one of Skips radiator overflow pressure valves on a 35 fordor sedan. It stopped a coolant loss/overheating problem with this car. This valve will allow a normally non pressurized system to maintain ~ 3#'s pressure IF the coolant system has no other leaks and the radiator cap seal is working. Make sure the valve is connected correctly to the overflow tube. Follow Skips instruction sheet regarding the red dot location. Make sure your radiator hoses are in good condition.

JM

FFracer

02-04-2013 @ 5:00 PM

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Everything is good, and yes the valve made all the difference. Car no longer pukes water, I ran over 75 miles at blood boiling speed(60-65)last weekend with no cooling issues at all 180*-185*.
My concern was the vacuum build up on cool down. It's the normal cycle you get with a modern pressurized system were the cap acts as a pressure valve during running, allowing water that accumulated in the overflow to be sucked back into the radiator as the engine cools and pressure drops, a 2 way valve if you will.
Now having thought about how this valve works there is no way for it to hold pressure in one direction and free flow in the other.
I just wondered if anyone else had or noticed this using the pressure valve... Might be I just got the cap really well sealed

Thanks,
Chris

TomO

02-05-2013 @ 10:33 AM

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Chris, I had the same problem with a new cap. I went to a pressure cap on my 40 to solve the problem. The 36 radiator neck is different to the 40 and probably will not seal with a pressure cap.

If my memory is correct, GM said to drill a small hole in the cap to allow air back into the system.

Tom

supereal

02-05-2013 @ 1:43 PM

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I'm not familiar with Skip's valve, but assume it is sort of a spring loaded check valve. I don't know if it will allow recovery of the lost coolant, but a catch bottle on the overflow will tell you. Otherwise, any coolant that passes the valve is just lost.

This message was edited by supereal on 2-5-13 @ 1:44 PM

02-08-2013 @ 4:06 AM

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I could be mistaken but I have never heard/read where GM/George Mitch*ll recommended drilling a hole in the radiator cap. He has mentioned drilling small holes in some thermostats to allow some coolant flow while the stat is in the closed position. He also mentions adding/replacing the seal on the early (non pressurized) radiator caps with a red rubber plumbing type gasket material. He recommends doing this to give ~ 3# pressure when using Skip overflow pressure release valve. I have no problems with expansion/collapsing of the radiator hoses on my '35 with a basically stock 221 21 stud engine using this release valve.

JM

TomO

02-08-2013 @ 7:06 AM

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JM, Thanks for correcting my memory.

Tom

35ford

02-08-2013 @ 11:10 AM

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I can tell you I had mine valve foul up because of rust pieces after probably after 3500 to 4000 miles. Blew a leak in the temp gage that I had added to one of the top hoses. Was in way homre from Oregon in my 32!

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