Kubota engine cooling problems
- Thread starter BMXER10
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Because the bad gasket leaks combustion gases into the cooling system and the cooling system is not designed to take away that much heat. Cylinder gas heat is supposed to go out the exhaust.BMXER10 said:
Usually you will lose coolant, either out the exhaust or into the crankcase if this is what's wrong. Do you have to add coolant from time to time?
There is no 'backwards' orientation to the fan, assuming this is the correct fam for the tractor. It probably will only go on one way and even if you can put it on 'reversed' you will find the blades still pull or push air in the same direction.
I see a few things, first thing I would do is get the right cap and that looks like the wrong battery. That battery looks way to big and is blocking off the hole grill and not letting air flow. what I would do is find out the size of the battery that came with that tractor new and see if the one you have is bigger. I think you will find that its not as thick and will set back away from the rad. letting air pass.
RichNJKubota
Gold Member
I'd pull the radiator and look inside. Look for crud clogging up the little tubes. Or just take it to a radiator shop. Around here they charge $25 for flushing the radiator with pressurized air and water. That usually cleans out crud. For more money they'll "rod" it out. They take the "tanks off the radiator and clean out each tube individually.
Soundguy
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Wow.. what a horrible design.. I hope that engineer was executed after he made that... yikes! ( ok.. not executed.. but at least spanked and made to wear a pointy hat.. )..
I'll bet the battery LOOOOVES that proximity to the radiator.. coupled with the reduced ariflow... Only thing I've seen close to that is a thermosyphon Allis G.. but it's radiator has WAY much more airway than that one.. Id bet from size cues that my little allis-G 62 ci gas engine also has a larger radiator than that , probably larger, diesel engine...
Soundguy
I'll bet the battery LOOOOVES that proximity to the radiator.. coupled with the reduced ariflow... Only thing I've seen close to that is a thermosyphon Allis G.. but it's radiator has WAY much more airway than that one.. Id bet from size cues that my little allis-G 62 ci gas engine also has a larger radiator than that , probably larger, diesel engine...
Soundguy
BMXER10 said:
Volfandt
Veteran Member
I agree w/chatme, that battery is way too big and that doesn't look like the correct radiator cap either.
The battery on my BX23's D905 is smaller than whats in your pic and it has to spin a bigger engine. If possible try to slide that battery back towards the dash as far as it will go, center it in the compartment and clamp it down there, the idea is to open up more space for air to get to the radiator.
The radiator cap on my D905 engine is a 9lb cap. The test for it is to pump it up with a radiator/radiator cap tester to 13 lbs. It should bleed down to 9 lbs in 10 sec's or more. If it takes less than 10 sec's it needs to be replaced. This may be true for your engine's cooling system also.
Since it seems to be overheating without any appreciable load, it wouldn't hurt to flush the radiator a time or too and even pull it it to ensure that every nook and cranny is clean and unobstructed. Tractors that work good and last along time can accumilate alot of debris in those hard to get at places and once they get full the troubles then start.
Good luck
The battery on my BX23's D905 is smaller than whats in your pic and it has to spin a bigger engine. If possible try to slide that battery back towards the dash as far as it will go, center it in the compartment and clamp it down there, the idea is to open up more space for air to get to the radiator.
The radiator cap on my D905 engine is a 9lb cap. The test for it is to pump it up with a radiator/radiator cap tester to 13 lbs. It should bleed down to 9 lbs in 10 sec's or more. If it takes less than 10 sec's it needs to be replaced. This may be true for your engine's cooling system also.
Since it seems to be overheating without any appreciable load, it wouldn't hurt to flush the radiator a time or too and even pull it it to ensure that every nook and cranny is clean and unobstructed. Tractors that work good and last along time can accumilate alot of debris in those hard to get at places and once they get full the troubles then start.
Good luck
SkunkWerX
Platinum Member
I agree with everyone who said the battery looked big, and is blocking the airway. Scooch it back away from the intake area, if at all possible.
Also, since you have to remove the radiator to take it to the shop, I'd go ahead and do a quick flush myself, into a 5 gallon bucket and inspect.
Check that wtaer pump while you are at it, and don't forget to flush the engine too.
And, since you will be doing "exploratory" sugery anyway, the head gasket won't be any easier to get to, than when you remove the radiator, may want to change it "on suspicion". Any white smoke out the exhaust? That is a sure sign of headgasket trouble. Sometimes you can smell it.
My last thought, don't hate me for this....
I gotta wonder how much overheating this motor has seen? If it's been donig this for a while, the guy may have gotten rid of it once it finally got so bad he couldn't run it for very long. So, do a compression check too.
Also, since you have to remove the radiator to take it to the shop, I'd go ahead and do a quick flush myself, into a 5 gallon bucket and inspect.
Check that wtaer pump while you are at it, and don't forget to flush the engine too.
And, since you will be doing "exploratory" sugery anyway, the head gasket won't be any easier to get to, than when you remove the radiator, may want to change it "on suspicion". Any white smoke out the exhaust? That is a sure sign of headgasket trouble. Sometimes you can smell it.
My last thought, don't hate me for this....
I gotta wonder how much overheating this motor has seen? If it's been donig this for a while, the guy may have gotten rid of it once it finally got so bad he couldn't run it for very long. So, do a compression check too.
gemini5362
Veteran Member
Let me try to offer a couple of solutions that dont require a lot of money or disasembly. They are not fixes but they are something to help try to narrow down the problem.
1. Head gasket. Blowns head gaskets most of the time are indicated by a couple of things either one or both. Notice I did say most of the time. A classic blown headgasket symptom is water in the oil. Your oil will look grey when you check it. Another symptom is that when you take the radiator cap off your water in the radiator will have bubbles in it that is not always from a blown head gasket but sometimes it is an indication. IF you water is frothy that is pretty much of an indication that you might have a blown headgasket
2. Battery in the way. remove the battery attach a pair of jumper cables to it wrap something around the positive cable to make sure it does not touch metal and then start it up. set a piece of cardboard on the hood and set the battery there. Hold it in place with something such as a bungee cord and see if it gets hot
3. Time how long it takes it to get hot. drive the mower around without engaging the mowing deck and see if it still gets hot. If it doesnt then you can see if there is something in the mower deck that is a problem.
My kubota b6200 has the battery in front of the radiator and does not seem to have much room for air flow but it never gets hot.
1. Head gasket. Blowns head gaskets most of the time are indicated by a couple of things either one or both. Notice I did say most of the time. A classic blown headgasket symptom is water in the oil. Your oil will look grey when you check it. Another symptom is that when you take the radiator cap off your water in the radiator will have bubbles in it that is not always from a blown head gasket but sometimes it is an indication. IF you water is frothy that is pretty much of an indication that you might have a blown headgasket
2. Battery in the way. remove the battery attach a pair of jumper cables to it wrap something around the positive cable to make sure it does not touch metal and then start it up. set a piece of cardboard on the hood and set the battery there. Hold it in place with something such as a bungee cord and see if it gets hot
3. Time how long it takes it to get hot. drive the mower around without engaging the mowing deck and see if it still gets hot. If it doesnt then you can see if there is something in the mower deck that is a problem.
My kubota b6200 has the battery in front of the radiator and does not seem to have much room for air flow but it never gets hot.