John Deere 6120 Problem is overheating moving. My John Deere 6120 worked for 1500 hours, after which it began to overheat, fuel consumption increased 2 times, wear on parts increased greatly. I don’t know what to do, I’ve tried everything. I think there is a problem with the cooling system, but I haven’t figured out what and how yet.
If the engine overheats due to insufficient heat dissipation, its power decreases, and fuel consumption, on the contrary, increases. In addition, this can lead to piston seizure, burning of valve heads, grease depletion, melting of bearing liners, destruction of the surface of the crankshaft journals. When the engine overcools due to heat loss, its power decreases, friction losses increase due to oil thickening, part of the working mixture condenses, expelling the lubricant from the cylinder walls. As a result, the corrosive performance of the cylinder walls increases due to the formation of sulfur and sulfur compounds in them. Refrigeration system faultsare.
- malfunction of the thermostat;
- contamination of the radiator;
- Lime deposits on the cooling jacket,
- slackening of the fan belt, etc.
What to do not to boil …
The density of the engine cooling system, as well as the technical condition of the radiator cap valves, is determined with a device consisting of a pump for pumping air into the radiator, a pressure gauge for determining the pressure in the cooling system and adapters to connect the device to the filler neck and radiator cap. To check the cooling system, the device is installed on the neck of the radiator instead of the removed cap.
If the water pump is driven by rubber belts, it is essential to control its tension using special devices (KI-13918 or KI-8920, etc.). Before the measurement, the sectors are adjusted, the slide of the charge indicator is returned to its original position
Checking the tightness of the water jacket is carried out at a coolant temperature of 80-85°C. To do this, remove the nozzle (spark plug) from the engine, set the piston of the controlled cylinder to top dead center (TDC) per compression stroke, turn on the transmission and the compressed air supply (at a pressure of 0.45-0.5 MPa) to the combustion chamber
Also, do not forget to check the cooling capacity of the radiator. If the difference in temperature of the coolant in the upper and lower tanks is less than 10 ° C, the radiator must be replaced or cleaned.
During seasonal maintenance, the cooling systems are flushed with water. To do this, the coolant is drained immediately after stopping the engine. And when it cools down, 50-60 liters of clean water is passed through the system with the radiator and cylinder block taps open and topped up with coolant.