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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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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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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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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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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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