kabota atv500 overheating
- Thread starter dmd170
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Code54
Elite Member
- Joined
- Aug 20, 2005
- Messages
- 4,312
- Location
- Putnam Co. West Virginia
- Tractor
- Kubota MX5100, Kubota BX25D,1957 Farmall Cub Lo-Boy Kubota KX91-3, BCS 853
I run two Kubota tractors and they are pretty decent at not getting clogged but even unclogged I am amazed at the amount of dirt I can rinse out of the radiator even when it looks clean. I personally found that if I spray the rad and let it soak for a few minutes before flushing it I can get the dirt out much easier.
As others have said check the thermostat as it can easily cause your issues.
Good luck!
As others have said check the thermostat as it can easily cause your issues.
Good luck!
SpudHauler
Gold Member
Four thoughts;
1 - how clean are the engine and transmission. Extra layers of mud and dirt on these aluminum engines act like a winter coat to hold heat. A good overall cleaning in the engine compartment might make a big difference.
2 - radiator fluid. Motocross bikes like a CFR450 Honda have small rads, due to weight of the rad and the coolant all add to weight which is important to racing, so cooling is always a problem given the mud and conditions they are used in. So one of the solutions is to use a special rad coolant that works better than the regular stuff for transferring heat. Engine Ice is good, Motul is good Maxima coolanol is good. Check at a local motorcycle shop for ideas.
3 - fan switch. The wire that goes to the engine block from the fan is just a ground that makes contact when the temperature reaches a setting. Tap a wire off this ground, add a switch and run the other side of the switch to ground and you can now control the fan. It will still work on it's own, but will come on any time you have the switch on.
4 - throttle stop. Add a throttle stop so they can't get full throttle. Just a few miles an hour slower might make the difference.
5 - thermostat. Try removing this from one of the machines. Will take longer for the engine to completely warm up but in the conditions you are working in that doesn't look like an issue. More flow might be the ticket to cooler engines.
Just some thoughts.
Good Luck.
1 - how clean are the engine and transmission. Extra layers of mud and dirt on these aluminum engines act like a winter coat to hold heat. A good overall cleaning in the engine compartment might make a big difference.
2 - radiator fluid. Motocross bikes like a CFR450 Honda have small rads, due to weight of the rad and the coolant all add to weight which is important to racing, so cooling is always a problem given the mud and conditions they are used in. So one of the solutions is to use a special rad coolant that works better than the regular stuff for transferring heat. Engine Ice is good, Motul is good Maxima coolanol is good. Check at a local motorcycle shop for ideas.
3 - fan switch. The wire that goes to the engine block from the fan is just a ground that makes contact when the temperature reaches a setting. Tap a wire off this ground, add a switch and run the other side of the switch to ground and you can now control the fan. It will still work on it's own, but will come on any time you have the switch on.
4 - throttle stop. Add a throttle stop so they can't get full throttle. Just a few miles an hour slower might make the difference.
5 - thermostat. Try removing this from one of the machines. Will take longer for the engine to completely warm up but in the conditions you are working in that doesn't look like an issue. More flow might be the ticket to cooler engines.
Just some thoughts.
Good Luck.
Gary Fowler
Super Star Member
- Joined
- Jun 23, 2008
- Messages
- 11,917
- Location
- Bismarck Arkansas
- Tractor
- 2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010
My RTV 900 will creep up into the edge of red if I run it WOT for a long time. I don't think the radiators have the capacity to cool properly when used in High range WOT for long distances. A mile or so it stays in the white but then it will start to creep up. I have not had it get really hot enough to have to shut down but it will linger at the edge of red, slow down a bit for a little distance and it goes back to white. Even at the red, it doesn't have the hot fluid smell of boiling antifreeze.
