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Ford 9N, 2N & 8N Discussion Forum
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radiator boil over

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allisue

12-10-2007 08:23:29




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I have a 48 8n side mount. Radiator is boiling over on me. I noticed that my fan blade is barely turning. I have put on new water pump, new belt (I have put it on tight and loose), the radiator is practically new, good cap, all new hoses (nothing blocking them), radiator is clean. Don"t know where else to turn. Thanks for any input. Mark




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RP-40-9n

12-10-2007 10:10:43




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 Re: radiator boil over in reply to allisue, 12-10-2007 08:23:29  
check for water in the oil, and oil in the water, could be head gasket. if that checks out good, then add a half bottle of dish washing soap to the radiator. could be gunk buildup in the water jacket of the motor. dont use soap powder, it would add to the problem if theres a blockage. RP



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old

12-10-2007 09:51:02




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 Re: radiator boil over in reply to allisue, 12-10-2007 08:23:29  
Well first off 1948 and side mount doesn't and never has been made. It wasn't till late 1950 that the side mount came out. But any how if the fan doesn't turn as well as it should the engine will over heat. First off with the belt off can you spin the fan. Not just turn it but give it a yank and it spins?? If it doesn't then you have a problem there. Next the belt has to be 3/4 of and inch wide not the normal 1/2 inch belts you use on a car or truck. Also is it 12 volts or 6 volts. If 12 volts the alternator pulley unless changed will be for the 1/2 inch belt and the rest of the tractor made for 3/4 inch and that will cause you problems like that also

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allisue

12-10-2007 10:01:46




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 Re: radiator boil over in reply to old, 12-10-2007 09:51:02  
Thanks for the info. I put on a new water pump and it doesn't spin as freely as the old one. I realize now that my old water pump wasn't bad. However, I don't think I can spin the fan freely. It will turn but with my help. It is a 6 volt system. I will check to see the size of the belt when I get home. All I know is that the guy who sold it to me said it was a 48 side mount. It is obvious it is a side mount but what you are telling me is that it has to be a different year model. Thanks, Mark

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Tom from Buckeye Lake

12-10-2007 15:16:25




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 Re: radiator boil over in reply to allisue, 12-10-2007 10:01:46  
Our 9N has a sidemount distributor and it is a 1942 model. And I know why. I changed the engine with a 1952 model.

Sure is sounding like a head gasket!!!!! !! No big deal, that is if all that is wrong is the gasket.



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old

12-10-2007 10:16:20




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 Re: radiator boil over in reply to allisue, 12-10-2007 10:01:46  
New water pump will not spin as free as the old one so your probably ok there. Sounds like you either have the wrong size belt or a bad belt. Also you only fill the radiator till you can't see the core say 1/2 inch over no more. And yes you have a 1950-1952 since they are the only ones with side mount



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allisue

12-10-2007 09:33:11




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 Re: radiator boil over in reply to allisue, 12-10-2007 08:23:29  
The radiator is not overfilled. The belt is not to narrow. All of the replies I have checked. Thanks, any other thoughts? Mark



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Art in Cortez, Co.

12-10-2007 09:09:09




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 Re: radiator boil over in reply to allisue, 12-10-2007 08:23:29  
Is your radiator full to the top? If so, expansion may be pushing out coolant. I have an 8N and the coolant level should only be up to about the top of the radiator coils.

Art



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Bob

12-10-2007 08:30:11




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 Re: radiator boil over in reply to allisue, 12-10-2007 08:23:29  
Is the fan belt you are using too narrow, so it "bottoms out" in the waterpump pulley and/or the crankshaft pulley, and slips?



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ED-IL

12-10-2007 08:29:49




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 Re: radiator boil over in reply to allisue, 12-10-2007 08:23:29  
do you have a thermostat in the hose? If the fan is barely turning is the belt slipping? also, if the fluid is too high it will puke out the extra (fluid should barely cover the coils)



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allisue

12-10-2007 09:49:49




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 Re: radiator boil over in reply to ED-IL, 12-10-2007 08:29:49  
No thermostat, I know that it would be better to have one but not having one shouldn't cause boil over. The belt appears to be riding the track just fine. I had to really pull down on the generator and tighten the belt to get it to grab and spin while starting it. I am new to the mechanic world but I have beebe reading all of the post and I have tried almost everything. Thanks, Mark



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Jack - Illinois

12-10-2007 11:22:41




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 Re: radiator boil over in reply to allisue, 12-10-2007 09:49:49  
Grab and pull down while starting???? Your generator should be tight enough that you can not grab and pull down on it and get any movement. Your belt should be tight enogh at all times that you can only depress it maybe 1/4" to 3/8" with you finger pushing on it between pulleys. A 1 x 4 board makes a good pry to hold the generator out while locking the adjustment slide.



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