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EFV-8 Club Forum / General Ford Discussion / Radiator overflow tank

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Posted By Discussion Topic: Radiator overflow tank -- page: 1 2     supereal 11-13-2009 @ 11:54 AM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 Be sure that whatever you use for an overflow tank is vented to the atmosphere, and the end of the feed connected to the overflow tube is at the bottom of the tank so it is always immersed in coolant. Install a pressure cap if you don't have one, and fill the system thru the overflow tank instead of the radiator cap once the radiator is full. This will allow the system to purge the air and replace it with coolant. In a properly configured overflow tank system your hoses should not collapse. In the case of a check valve in the overflow tube, there is no way for either air or coolant to replace the coolant lost from heat expansion, and thus the hoses collapse. wmsteed 11-13-2009 @ 8:32 AM reply profile send p.m. Senior Posts: 613 Joined: Oct 2009 DUH ?... drilling a hole in the cap and/or removing a portion of the cap gasket would defeat the whole principle of an overflow tube/tank or Skip's pressure valve. For the life of me I can't see why people have reluctance to use a simple improvement like an overflow tank that has been standard equipment since the late 1960's on most water cooled engines. I can understand the reluctance to follow in the footsteps of the "Rat-Rodders" using pop bottles, beer cans, etc.... if you don't like the looks of the billet style overflow tanks, simply spray the thing with flat black paint. It could just be that overflow tanks fall into the realm of PCV's, the later of which I usually install on all of my old cars... Bill 36 5 win delx cpe MOXIE 11-12-2009 @ 5:45 PM reply profile send p.m. New Member Posts: 102 Joined: Oct 2009 Drill a hole in the radiaotr cap or cut the seal. What magic is going to keep the fluid from spraying out the hole when the system heats up with pressure. TomO 11-12-2009 @ 4:52 PM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 When the engine reaches operating temperature, both the coolant and the air in the system expand. The air is forced out the overflow. When your engine cools, air cannot get back into the system through the radiator cap or Skip's pressure valve, so the vacuum in the system causes the hoses to collapse. You can help relieve the problem by drilling a hole in the radiator cap, cutting part of the inner seal of the cap to allow air to enter the system or install a 4lb pressure cap. Tom 39Fordfan 11-12-2009 @ 12:34 PM reply profile send p.m. New Member Posts: 192 Joined: Oct 2009 I agree with your assessment Moxie, but my understanding is that this sucking the hoses in is NOT supposed to happen with Skip's valve. I'd like to know why not, and why mine does suck the hoses in anyways. t35 11-11-2009 @ 6:38 PM reply profile send p.m. Member Posts: 34 Joined: Oct 2009 i installed that overflow tank on my 35, and installed skips valve at outlet of overflow tank. it keeps the pressure in the system and increases the capacity. i used it all this past summer and it worked great. tom MOXIE 11-11-2009 @ 3:54 PM reply profile send p.m. New Member Posts: 102 Joined: Oct 2009 They collapse because when the engine cools down it creats a vacuum and since air can not get into the engine, the hoses suck in. That's why I'm not a fan of skip's valve. I rather have an overflow tank. I've tried it already by sticking the end of the overflow hose in a jar. When the engine heated up, fluid filled the jar and sure enough when engine cooled, the fluid sucked back into the engine.. Now yes I know it's better to have the water in the engine than a jar but I'm not losing that much water to make a difference and there is something about having pressure in the radiator and engine that I do not like. Now if I can just get my cap to be leak tight. 39Fordfan 11-11-2009 @ 7:47 AM reply profile send p.m. New Member Posts: 192 Joined: Oct 2009 Understood. After the engine cools down I can take the radiator cap off and the top hoses will expand almost back to normal from being collapsed. So why is it that the upper radiator hoses collapse when using Skip's valve and a good sealing radiator cap? Thanks. TomO 11-11-2009 @ 7:26 AM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 His valve is a pressure relief valve and has no provisions to let air back into the system. Tom MOXIE 11-10-2009 @ 1:54 PM reply profile send p.m. New Member Posts: 102 Joined: Oct 2009 Why would they collapse. Does skip's valve not let air back into the system when the system cools down. Isn't his valve like a check valve.

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