Forum › Forums › Tractor Troubleshooting › operating temps
- This topic has 11 replies, 3 voices, and was last updated 8 years, 5 months ago by Bob Rooks.
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June 5, 2016 at 3:21 pm #46139
I have a 2005 dong feng le204a . It has always ran well and given me no trouble but it has always had a problem getting it to operate hot enough. I have it now to run at 70 c. I guess about 157 f. pulling a 5 ft finish mower. it has as best as I know 180 f . thermostat. When I look inside the radiator neck I see circulation at 120f. it has a thermostat bypass I guess to help air work around the thermostat , I have threaded it and bushed it down to restrict the flow and it helped some. should I leave it alone ? or add a valve in the bypass tube so air can be worked out then shut it off?
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June 5, 2016 at 4:53 pm #46140
Actually that’s not the purpose of the by-pass circuit. The main reason for it is to allow coolant flow while the thermostat is closed to prevent pump cavitation. I would double check your thermostat to make sure it isn’t sticking open, and also to see what it’s actual rating is. You should have no air in the cooling system at all because air can’t transfer heat like coolant can. Ideally you want a one quart coolant recovery bottle connected to the radiator overflow tube. This will assure that air is not sucked back into the system.
70° C = 158°. You should be running at least 85° C = 185 ° F. Running the engine “cold” like that prevents moisture from being evaporated from the oil, but also allows more soot to form in the combustion chamber and contaminate the oil. Those two items are just a tip of the iceberg as to why engines should run very warm.
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June 5, 2016 at 5:57 pm #46141
ok the recovery bottle might be a challenge but I shall see if I can come up with something and I will just replace the thermostat with a 180 , what do you think about drilling a small hole in the thermostat and not using the bypass?
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June 5, 2016 at 6:46 pm #46142
Thermostats usually come with a small hole in them. Some even have a tiny rattler type check valve. I would not block off the by-pass at all. Coolant recovery systems usually run about $10. at most auto parts houses. Even a Mason jar will work with a hose to within 1/2″ of the bottom, and half full when cold. Do you have this type of thermostat?
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June 5, 2016 at 7:24 pm #46144
I can not remember it has been a few years since I was in there , but I am glad to see that about the rubber ring I had forgot about that thread that could be the problem in its self. how many pound of spring do you think on the rad. cap?
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June 5, 2016 at 10:17 pm #46145
I believe the radiator caps should be 7 psi, or .48 bar. Double check that.
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June 6, 2016 at 10:40 am #46147
well I just pulled it apart and it has a 72c thermostat now it make sense it ran at 70 c the rad cap was marked 0.6 . I will put in a 180 f thermostat and a recovery bottle and see what happens.
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June 6, 2016 at 3:10 pm #46148
.6 bar = 9 psi. You’re good with that.
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June 6, 2016 at 7:39 pm #46151
well ran it with a mower for a hour stayed at 180 f . hopefully it will run warmer in the winter now. but I did not like how I had to place the coolant tank to get it high as possible if it does not do much reclaiming ( with the extra 20 degrees f.) might move it to a different tractor that it will fit better.
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June 9, 2016 at 7:39 am #46154
Aha, now I know why my dozer was losing coolant this week. The radiator cap rusted out so I scrounged another one from my junk pile but it has a weaker spring. I started root-raking a paddock and after 20 minutes noticed the temperature creeping up over 90C. I shut down and popped the hood and saw coolant running out the overflow. It lost over 2 litres. Better get the right cap.
Dozer YCT306S shuttle shift - root rake, tree-pusher, backhoe
Excavator Hyundai 17 tonQLD, Australia
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June 10, 2016 at 7:10 am #46155
just do not get one that has to strong of a spring , the Chinese radiators are really thin
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June 10, 2016 at 2:03 pm #46158
The coolant recovery reservoirs can be mounted almost anywhere that’s convenient. They don’t even have to be near the engine as long as the tube remains full. The tube should always be located below the coolant level in the reservoir. If it goes in from the top it should go to within 1/2″ from the bottom. The reservoir must be vented to the atmosphere. The radiator cap allows coolant to be drawn back into the radiator during cool down.
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