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Re: Update on overheat problem
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Just so you will have a reference flow test the rad are ask the rad man to show you (shadtree way) how the repaired one flows when you pick it up... When faced with your type of issue I flow test them on the tractor car are what ever it saves LOTS of time and aggravation...
Simple flow test Hold your hand over the outlet fill the rad with water,,, remove your hand from the outlet it should dump the water in about 3 sec. ( I've never quantified any drain time rates, I just go with my gut feeling,,, anything over 4/5 sec throws up a flag to me). If it drains slowly it has partly blocked tubes. Anytime I have a heating issue that flairs up while driving are work'n I go straight for a flow test....
Every rad you can get your hands on flow test it to build knowledge of how a good one should flow.. Even if I replace a leaker I take the old one out back and flow test it...
What I found on the net
Radiators can be tested on a radiator test stand, these are expensive machines so not many shops have them or working ones at least. A find most shops that repair radiators just plug the bottom end ( cross flow turn it on its side) and fill the radiator with water and then unplug the bottom and watch the flow of water coming out. You really need to know the flow rate of a new radiator for your application as a base line. A big Detroit Diesel would be about 110 GPM (Gallons Per Minute) vs a pickup at about 55 GPM.
Using those figgers "a pickup at about 55 GPM." It looks to me that around a gal a second would be excellent flow...
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