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Tractor Talk Discussion Forum

MF Heating Problem ?

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stan

03-13-2004 08:22:12




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My MF has a three cylinder perkins diesel. I replaced the thermostat. When it runs I feel the hoses from the water pump, and they are always cold. It never boils, but I am concearned because it doesn't seam to circulate water. The thermostat is instaled correcyly, and the water pump is new. Any thoughts?




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Bob

03-13-2004 20:11:56




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 Re: MF Heating Problem ? in reply to stan, 03-13-2004 08:22:12  
The water pump PULLS the coolest water from the bottom of the radiator, and forces it into engine block, and when the water at the top of the engine at the thermostat area reaches the set temperature of the thermostat, the thermostat opens and allows the HOT water to leave the engine through the upper radiator hose.

Therefore, the lower hose and the water pump will be cooler than that top of the engine, and the top of the radiator, especially during cool weather, and under conditions of idling, or light load.

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RAB

03-14-2004 00:12:26




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 Re: Re: MF Heating Problem ? in reply to Bob, 03-13-2004 20:11:56  
About right but not quite. The primary job of the pump is to circulate coolant around the engine at all times while the engine is running. Coolant is only allowed to be pumped from the engine to the radiator when the engine is at, or rather above, the thermostat rating. Cooler coolant from the radiator bottom will normally be mixed with hot circulating coolant before being circulated around the engine. A little different than the old thermosyphon systems where the cooled coolant returned to the bottom of the block.
Regards,RAB

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JOHN (LA)

03-13-2004 11:58:39




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 Re: MF Heating Problem ? in reply to stan, 03-13-2004 08:22:12  
First are you sure it is not heating up. Check engine temp with a gauge and radiator temp with a thermometer.
If the motor was over heating but radiator is cold I would start by checking for a blockage. Take the radiator cap off and see if water is circulating.
If it is NOT circulating even when warm you have a blockage of some type.
Water jackets in motor
Collapsed radiator hose on inside but looks fine on outside.
Radiator clogged.
Thermostat. remove a check on stove even though it is new.

Second is how hard are you running it and how hot or cold is it outside. This may be more the problem you have since you say radiator is cold and engine is normal. A diesel will heat up at idle or slow use with a thermostat installed and show it on the gauge but the radiator will never get warm. What happens is the engine heats up. The thermostat opens and lets in some COLD water then shuts right away. It does this to keep the engine at proper temp. Engine reheats and this repeats. Bottom line is the radiator never gets hot. A diesel is built with a extra large cooling system to handle all day grueling conditions and the radiator will cool the water much faster than a slow running engine can produce heat.

This is why you can burn up a new gas car trying to keep with a large truck in the desert.

Best bet is CHECK TEMP of engine with a good gauge installed in the water jacket of the block.

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rod

03-13-2004 10:17:22




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 Re: MF Heating Problem ? in reply to stan, 03-13-2004 08:22:12  
hey do you have a heat gauge installed my MF 203 has 3 cyl perkins and it does warm up on the gauge. you could try a piece of cardboard in front of the radiator see if it gets more warm diesels run cool anyway. Is the fan turning that is the belt is not slipping? regards
rod



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