The reason why diesel fuel is ingress into the 120kw generator water tank and engine oil

The cylinder head has air holes or cracks. In the PT fuel pump fuel supply system of Cummins diesel engine, the diesel channel is on the cylinder head, and the cylinder head has both oil and water channels, as well as diesel channels. When working, the diesel pressure in the diesel channel on the cylinder head is, the pressure of the water is less, the diesel pressure is higher than the pressure of the water, once the porosity, sand hole or crack appears on the cylinder head, the waterway and the diesel channel will be connected, then the diesel will enter the waterway.

The seal is failing or the mechanism is faulty. For example, the oil seal of the spindle of the PT pump fails, and the diesel fuel enters the timing gearbox and reaches the oil pan; The oil shut-off valve at the diesel outlet on the PT pump is not tightly closed, although the diesel engine has been shut down, but due to the high position of the diesel tank, the diesel can still enter the oil pan along the following routes: fuel tank oil pipe PT gear pump oil shut-off valve (when closed is not tight) oil pipe fuel injector (in the oil return and oil measurement stroke of the injector, the diesel and diesel tank in the nozzle cavity are connected, and the diesel oil drips into the combustion chamber through the nozzle under the action of atmospheric pressure) combustion chamber oil pan; When the injector hole is too large, damaged, or the upper and lower O-rings of the injector are damaged, the diesel fuel will enter the combustion chamber and then seep into the oil pan; When the check valve on the return manifold of the PT fuel system fails, the diesel will flow through it to the injector and seep into the oil pan flat; There is a manual shut-off valve installed at the outlet of the diesel tank, if the valve core is damaged and closed loosely, the diesel fuel will also flow into the combustion chamber and enter the oil pan; The pressure of a cylinder is too low, causing the cylinder to not work, causing the diesel to flow into the oil pan; The diesel engine has insufficient air intake, which is unsafe for combustion, and the diesel will flow along the cylinder wall into the oil pan.

When dismantling and inspecting the diesel engine, it was found that there were many sand holes around the injector of the first cylinder, because the diesel pressure was greater than the pressure of the water when the engine was working, the water could not flow into the diesel channel around the injector, so the diesel entered the water tank; The top of the push rod of the cylinder injector is broken and the push rod of the V cylinder injector is bent, resulting in the change of the lift of the push rod of the cylinder injector, and the oil supply can not be accurately supplied, resulting in the diesel fuel can not be completely burned and flows into the oil pan; In addition, after removing the oil outlet pipe on the oil shut-off valve of the PT pump, it was found that diesel fuel was still flowing out of the oil shut-off valve. Diesel no longer seeps out after cleaning the spool; At the same time, after replacing the cylinder head and push rod with a new one, the fault phenomenon was eliminated.

Hello. Check the oil pump or head gasket.

The maintenance method of diesel generator water tank is mainly divided into two steps, one is the external cleaning of the 120kw diesel generator water tank, and the other is the internal descaling of the water tank

First, first of all, the diesel generator water tank should be cleaned externally, the method is sprayed from the front of the radiator to the direction of the fan, but it should be noted that the diesel generator should be blocked with adhesive tape, and the stubborn sediment should not be removed, the radiator should be removed and immersed in hot alkaline water for about 20 minutes, and then cleaned with hot water.

2. Internal descaling of the diesel generator water tank: First of all, drain the water from the radiator and unseal the place where the radiator is connected to the pipe; Pour the 4% acid solution into the radiator, drain the acid solution after 15 minutes, and check the radiator. If there is still limescale, wash it again with 8% acid solution; After descaling, neutralize twice with 3% alkaline solution, and then rinse with water more than three times.

Check the water and oil of the water tank before starting the machine, and generally add antifreeze in winter to prevent the water tank and cylinder from freezing in winter. In summer, pure water is generally added, and the company is not so bad for a little money, so you must stop adding water when adding water. To check the engine oil, there is an oil scale with upper and lower lines on it, and the general oil is added to the middle and high positions.

CF15W-40 is best used with special engine oil. If the generator is not used frequently, it should be started for 30 minutes a week to keep the battery sufficient. The three filters are changed every 250 hours.

In the summer, as long as it's not sewage. In principle, soft water should be added. In winter, it is best to add antifreeze.

If you add water, remember to drain the water tank and the body after the water temperature drops below 60° after the shutdown, and drain both places. There is a water discharge switch under the water tank and next to the body. The engine oil is diesel engine oil, which is 40 in the summer for new cars, 50 for old cars, and winter engine oil in winter.

The height of the oil should not be lower than the cut line and not higher than the top cut line. The specific maintenance should be detailed in the manual, how long to change the oil, how long to change the filter element (including oil filter, diesel filter, air filter) for reference only (Fujian Yanan Motor).

The diesel generator set water tank and engine oil eventually enter the diesel, many users have encountered such a situation, the specific reasons are as follows:

1. The seal fails or the mechanism is faulty. For example, the oil seal of the spindle of the PT pump fails, and the diesel fuel enters the timing gearbox and reaches the oil pan; The oil shut-off valve at the diesel outlet on the PT pump is not tightly closed, although the diesel engine has been shut down, but due to the high position of the diesel tank, the diesel can still enter the oil pan along the following routes: fuel tank oil pipe PT gear pump oil shut-off valve (when closed is not tight) oil pipe fuel injector (in the oil return and oil measurement stroke of the injector, the diesel and diesel tank in the nozzle cavity are connected, and the diesel oil drips into the combustion chamber through the nozzle under the action of atmospheric pressure) combustion chamber oil pan; When the injector hole is too large, damaged, or the upper and lower O-rings of the injector are damaged, the diesel fuel will enter the combustion chamber and then seep into the oil pan; When the check valve on the return manifold of the PT fuel system fails, the diesel will flow through it to the injector and seep into the oil pan flat; There is a manual shut-off valve installed at the outlet of the diesel tank, if the valve core is damaged and closed loosely, the diesel fuel will also flow into the combustion chamber and enter the oil pan; The pressure of a cylinder is too low, causing the cylinder to not work, causing the diesel to flow into the oil pan; The diesel engine has insufficient air intake, which is unsafe for combustion, and the diesel will flow along the cylinder wall into the oil pan.

2. There are pores or cracks in the cylinder head, the PT fuel pump fuel supply system of the diesel engine, the diesel channel is on the cylinder head, the cylinder head has both the oil channel and the water channel, and the diesel road, when working, the diesel pressure in the diesel channel on the cylinder head is, the pressure of the water is less, the diesel pressure is higher than the pressure of the water, once the porosity, sand hole or crack appear on the cylinder head, the waterway and the diesel channel will communicate, then the diesel will enter the waterway.

Is the pipe connected incorrectly??

The oil and water mixed and the radiator was rotten.

Pump [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

1. It is most likely that the waterproof ring of the cylinder is aging or damaged, resulting in the oil entering the water tank during the heat up!

2. If it is a diesel engine that has just been repaired, then the problem will be eliminated in two days.

3.The sealing ring of the oil radiator is not tightly sealed, the radiator plate is damaged, and the gasket leaks.

The only solution is to replace the cylinder gasket, because the cylinder gasket has a crack, and the oil enters the cooling water tank through the crack when the piston moves.

Punch up....It is recommended to remove the cylinder head [If there is a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】