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WD
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Cooling System - Help?

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Rock_Picker

06-20-2003 20:37:29




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I'm trying to determine why my WD blows engine coolant out the overflow tube of the radiator. A radiator shop verified the radiator does not leak and flows adequately. A new 7 psi radiator cap has been installed. I tried running the engine with the cap off and looking for bubbles in the upper tank of the radiator, but the water pump flows so much there is a steady stream (large one) of coolant going into the tank at all times. There is no thermostat in the hose between the water pump and radiator. I suspect a head gasket or cracked head may be allowing the radiator pressure to increase to the point where the cap just relieves the pressure. There is no sign of anti-freeze in the crankcase oil. Is there a simple way to measure the pressure in the cooling system with the engine running? I would appreciate hearing from others who have had this problem and how they solved it.

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Rock_Picker

06-22-2003 19:26:59




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 Re: WD - Cooling System - Help? in reply to Rock_Picker, 06-20-2003 20:37:29  
Thanks for the recommendations fellas - they sound logical. I'll follow up............RP



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wdTom

06-22-2003 14:54:55




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 Re: WD - Cooling System - Help? in reply to Rock_Picker, 06-20-2003 20:37:29  
AC says in the WD manual that the temp. should be min. of 170 for gas and 190 for low octane fuel or tractor fuel. Mine with a new radiator core, and a rebuilt engine runs right up to 180 with a thermostat. Try letting it puke out what it wants to and see if the level stays constant after it gets to where it wants to be.



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Ron

06-22-2003 06:45:57




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 Re: WD - Cooling System - Help? in reply to Rock_Picker, 06-20-2003 20:37:29  
Always use a thermostat in an in-line engine--!!! The Front cylinder ALWAYS wears toward the cold in-comming water.!!! Wear is dramaticly Reduced when proper operating temp is maintained... I only keep the coolant level high enough to touch with the tip of my finger, over the plate under the radiator cap...otherwise, it just over-flows when at operating temps.!! Ron.



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DAve K

06-21-2003 12:37:48




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 Re: WD - Cooling System - Help? in reply to Rock_Picker, 06-20-2003 20:37:29  
I agree with Duey. If I fill mine anywhere near the top it will overflow as it expands. Just cover the tubes about 1/2 inch. You do need the thermostst, it restricts that heavy surge from the pump into the radiator plus lets your engine run at the right temp. Napa has them for a few bucks. Be careful not to twist off any of the three bolts that hold the thermostat housing to the head! I broke one and had to drill it out and retap it. Also gunk up the gasket with permatex #2 or such so it does not leak. Sometimes the housing is pitted enough you need a little more than just a gasket on there. Just a light coating on both sides worked for me.

Dave

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Duey (IA)

06-20-2003 20:53:35




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 Re: WD - Cooling System - Help? in reply to Rock_Picker, 06-20-2003 20:37:29  
RP,
First, you may have the radiator overfilled. It only needs to be full enough to see fluid. The fluid will expand and over flow when hot if you have it too full. The thermostat should be located in the thermostat housing fastened to the head (what the top hose fastens to) With the top hose off you should be able to look in the housing and see the thermostat.



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