When the diesel generator is first started, due to the low oil temperature, the oil circulates through a small cycle, that is, the oil does not pass through the oil cooler and directly enters the oil filter before entering the lubrication related parts of the main oil passage. When the temperature of the diesel engine rises, the thermostat starts to work (open), and the oil begins to circulate in large quantities. After being cooled by the oil cooler, it enters the oil filter and lubricates the relevant parts. This circulation method shortens the preheating time for starting the diesel engine.
1. Working principle of oil temperature control valve
When the oil temperature is below 90 ℃, the temperature control valve opens the oil bypass passage, and the oil enters the oil filter and main oil passage directly without passing through the oil cooler. When the oil temperature exceeds 90 ℃, the temperature control room closes the oil bypass oil passage. At this time, the oil passes through the oil cooler for heat dissipation and enters the oil filter and main oil passage.
2. Maintenance of oil temperature control valve
For diesel generators equipped with oil temperature control valves, the working status of the temperature control valve should be regularly checked. During the use of a diesel engine, if it is found that the oil temperature rises rapidly and the temperature is too high during idle operation (above 110 ℃), it is generally caused by a malfunction of the temperature control valve.
The main characteristic of the oil temperature control room of diesel generators not working is that the cooler temperature is not high and the oil filter is hot. At this point, it is necessary to check the oil temperature control room.
The simplest and easiest detection method is to remove the temperature control valve and clean the appearance of the valve from oil and other dirt; Place the temperature control valve under the water surface inside the beaker. The temperature control valve can be suspended inside the beaker with iron wire, leaving it 20-30mm away from the bottom of the beaker.
Slowly heat the water in the beaker to the opening temperature of the temperature control valve, maintain the opening temperature for 5 minutes, and check if the temperature control valve is in the open state.
Continue heating until the temperature control valve is fully open, hold for 5 minutes, and measure the valve stroke. Check if the coolant is fully closed when the temperature drops below the shutdown temperature. When checking the above items, if any of them do not meet the specified requirements, the temperature control valve should be replaced.
Diesel generators equipped with oil temperature control valves often experience excessive oil temperature due to the failure of the temperature control valve (not closing). When such faults occur, as an emergency response, the temperature control valve can be removed and the through-hole can be blocked (note: if you are not familiar with the lubrication system's oil circuit, use with caution), so as to ensure that the oil temperature is in a normal state.
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