There are several reasons for the boiling of Dongfanghong 4-cylinder diesel engine, most of which are evaporative cooling, and some of them are cooled by circulating water pump to radiator. First, the evaporative cooling engine has a long working time and a large load, and the boiling of cooling water (commonly known as "boiling") is a normal phenomenon; If the working time is short, the load is small and the temperature rises rapidly, "boiling" is a fault. Fault analysis: such as poor sealing of cylinder gasket, air leakage of cylinder gasket, high-pressure air escaping from cylinder into water tank (commonly known as cylinder gasket); There is another situation, such as cracks in the cylinder liner or cylinder head, which will make high-pressure gas escape into the water tank. This kind of fault will make the water temperature rise rapidly and "boil" ahead of time, which will seriously lead to the difficulty in starting the engine. This fault can be found by observing that there are black oil flowers floating on the surface of the coolant in the water tank. When starting, coolant is discharged from the exhaust pipe, and bubbles roll up in the water tank, which are all phenomena of cylinder gasket. Troubleshooting: Replace the cylinder gasket, check the cylinder liner and cylinder head for cracks, and replace with new parts. 2. The working water temperature of the engine with circulating cooling water pump is about 85℃. Working temperature is too high and even the water tank "boils" is a fault. Fault analysis: Cracks in the above cylinder gasket, cylinder liner and cylinder head are the causes of the fault. Overload, insufficient coolant, blocked radiator and poor working performance of water pump slow down the circulation speed of coolant. Incorrect cooling fan angle, loose fan belt and insufficient air volume will make the cooling performance worse, resulting in too high or even "boiling" of engine coolant. Troubleshooting: replace the cylinder gasket, check the cylinder liner and cylinder head for cracks, and replace with new parts; Add coolant, clean the dirt inside and outside the radiator, replace the new water pump, and adjust the fan angle and belt tightness to the specified value. 3. Check whether the oil supply system of the engine is faulty. If the fuel supply time is too early and the atomization quality of the fuel injector is not good, the engine temperature will be too high, the power will be reduced and the fuel consumption will be increased. Troubleshooting: Adjust the fuel supply time to the specified value, replace the fuel injector, and readjust the fuel injection pressure.
Dongfanghong YTR4 105 diesel engine 1. There is oil leakage, not only from the outside, but also from the main oil circuit to the oil pan; Check whether the contact surface is in good contact and whether the paper pad is damaged.
2. The oil pressure sensing plug is faulty and needs to be replaced.
Dongfanghong 4 105 diesel engine oil burning 1 blue smoke does not mean oil burning.
2 If the oil is reduced, the four matching assemblies are wrong.
3 damage and aging of valve guide
The air leakage of Dongfanghong 4 105 diesel engine is a common problem encountered by many users. Generally, this situation needs to be replaced by four sets. Before replacement, it is best to check whether the bottom hole of the cylinder liner of the engine block is not round. If the engine block is not round, even if four sets are replaced, this problem may not be completely solved.
How many drain switches does Dongfanghong 4 105 supercharged diesel engine have? There is 1 near the oil pump, 1 below the water tank and one below the oil cooler. I wonder if there is 1 under the water pump!
4 105 Diesel engine Dongfanghong or Yuchai, which do you think is better? Yuchai is the designated manufacturer of national model 105. After decades of development and absorption of international advanced technology, Yuchai machinery is not what it used to be.
Is Dongfanghong LR4 105 diesel engine different from Dongfanghong YTR4 108 diesel engine in horsepower, low power and low fuel consumption, but good quality?
I am a 65 horsepower diesel engine of Dongfanghong 4 105. Can you replace it with a 75 HP diesel pump of Dongfanghong 4 105? Can I increase the horsepower? Is the cardinal number the same? Increasing horsepower may not only require replacing the oil pump, but also the piston nozzle may be slightly different. Just consult the repairman specifically. Generally, most of the horsepower changes of domestic diesel engines with the same brand and diameter are the same, but I'm afraid it's not possible to change only the oil pump.
Dongfanghong diesel engine has several drain switches. Multi-cylinder diesel engines are generally equipped with drain valves. Usually, they should be near the rear of the oil pump. The water pump drain valve is under the water pump. The water tank drain valve is located at the bottom of the water tank. There is also a drain valve on the left side of the horizontal bar machine at the bottom of the cylinder head.