I have a case maxi 50 mini digger with the mitsubishi K4N engine and it runs very hot and will eventualy boil over, i have done the head gasket and had the head skimmed and crack tested, i have changed the thermostat and water pump, i flushed the radiator. any ideas on why it still boils the water?
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Pam are you sure it's boiling? If the Antifreeze is boiling I'd think you'd see steam coming out of your reservoir as the water expands into the reservoir, but you didn't say you see anything like that.
Of course engines get hot, that's why we have the cooling systems but it doesn't sound like it's "boiling" to me with no signs of visible steam unless your antifreeze level is really low?
If it's really boiling, and you antifreeze level is good, then your reservoir should be getting filled up with expanded hot water that goes into it to catch it when it expands.
If the water isn't going into the reservoir, then maybe your antifreeze level in the radiator is too low and you need to add antifreeze?
Best to fill the radiator with the engine cooled down. If you ever have to open the radiator when it's hot, NEVER open it with your bare hand as you could get scolded with boiling water. Instead use a big thick towel to remove the radiator cap off a hot engine. Again, if you can, just wait until the engine cools then open the radiator cap.
With the engine cool, you can fill the radiator with a 50/50 antifreeze mix. The 50/50 mix come premixed 50 percent water, and 50 percent antifreeze. So you can throw that stuff straight into the radiator.
Non mixed antifreeze needs to be mixed 50/50. Some people use 50 percent distilled water when they mix it because distilled water doesn't have the minerals in it that may get stuck in your radiator. That's being a bit picky about it though. Tap water works fine in a pinch. The other 50 percent is antifreeze. You can mix it right in the radiator too, put in a measured amount of the antifreeze, followed by the same measured amount of water. The water pump will mix it all together when you run the engine.
Put the cap back on and run the engine and if/when the water "boils" it should go into your reservoir. If it does boil in go in the reservoir then yes...your engine is getting hot and the antifreeze is boiling.
When the antifreeze boils, it's probably because your thermostat is stuck closed. That means the thermostat isn't letting water circulate through the radiator to get cooled. Thermostats are cheap...no more than $30 I'd say for most cars. Changing them is pretty easy too as they are usually right at the top of the engine. A mechanic may charge $100 to change it....but it's an easy job on most vehicles requiring just a couple sockets/socket wrench.
Pressure valve? does it only do it to only one side? Left or right. The reason you move both tracks with the bucket running is because you relieve pressure. One side is free wheeling, As they call it. I work on cars, But also have done to many hydraulic components. You have a pressure control valve that is bad.
car over heating because thermostat faulty its stuck closed not opening allowing coolant flow from engine to radiator.hot climate need 50/50 antifreeze and water.straight water will boil away at 212 degrees. engine can get hot as 225 degrees you need add coolant to raise engine coolant boiling point temperature.
YEP LOW COOLANT WILL CAUSE ENGINE OVER HEAT.BE SURE TO HAVE CORRECT MIXTURE 50/50 COOLANT AND WATER.TOO MUCH WATER IN COOLANT SYSTEM WILL CAUSE IT TO EVAPORATE AWAY.NEED ANTIFREEZE TO RAISE BOILING POINT.
Check the thermostat...drop it into a pan of boiling water and check that it pops open. Take the pan off the heat and check that the 'stat pops closed (about 80 centigrade). Next check out radiator...remove top and bottom hoses and back flush with a garden hose through the bottom hose connection to remove any obstruction, rusty gunk build up. Flush out hoses to engine (bottom one especially) if full of crud. Flush system out until water runs clean. Drain complete system and refill with 50% water : 50%antifreeze mix. Check for compatible antifreeze for your engine not all anti freezes are the same. Antifreeze contains anti corrosion inhibitors which will prevent further crud build up. As the engine warms up ensure that all air is expelled by squeezing hoses etc. Ensure top hose becomes hot and if you have an electric fan that it come s on fully. If it fails to engage then chack out temperature sensor (not the same as 'sender' to the dash display), check out fan relays and fuses. Hot wire the fan with trailing wires from the battery to ensure that the motor is OK as a final check.
flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on