Where is the engine return line?
Below the fuel nozzle
The engine return oil line is usually located below the fuel injection nozzle and branches out from the inside . The inlet tubing is usually thicker than the return tubing, and the inlet tubing is connected to the fuel filter element.
The function of the return pipe is to relieve the pressure of the gasoline, reduce the fuel consumption, and return the excess fuel and gasoline vapor to the tank. In the diesel fuel supply system, the return pipe also plays a role in ensuring the stability of the pressure of the fuel system, so as to avoid the effect of too high or too low fuel on the working efficiency and life of the engine.
What symptom does the car return oil line block?
The car oil return pipe is blocked, and the following symptoms appear:
1, the consequences of the car return oil pipe plug will affect the start, because it is pressurized combustion, if the fuel ratio is not controlled well in the fuel injection time and space, it will be. But usually it starts, just black smoke;
2, the car return pipe is blocked because the oil pressure given by the oil pump is not normal. Oil pressure valve is not damaged;
3, the fuel pump supplies oil to the engine, forming a certain pressure in addition to the normal supply of fuel nozzle injection, the remaining fuel is sent back to the tank through the return pipe, of course, and the excess gasoline steam collected by the carbon tank is also returned to the tank through the return pipe.
Unsteady idle speed, engine jitter, stalling during driving, and sluggish throttle response. The common parts of oil circuit blockage are the suction pipe in the oil tank, the filter screen, the diesel filter, the oil tank cap vent and so on. The main problem caused by the blockage of the oil circuit is the injection of diesel oil that does not meet the standard, or the mixing of impurities in the refueling process. The key to prevention is to ensure diesel clean and oil circuit seal, regular maintenance of the oil circuit, strengthen the cleaning and maintenance of the diesel filter, timely cleaning or replacement of the filter element, timely cleaning of the oil tank according to the operating environmental conditions, and thoroughly remove the sludge and water at the bottom of the oil tank. To clean the oil pipe, replace the oil filter, air compressor oil, head, etc.
There will be a significant decrease in power due to the blockage of the return oil line, and the engine multi-cylinder intermittent lack of fire, that is, this cylinder does not work, and then another cylinder does not work, resulting in weak acceleration and serious engine shake.
There's gas in the engine return line. What happened?
The main reason for the engine gas return line .
aging or damaged oil pipe : diesel engine pipeline is rubber, aging hard and brittle, the seal is not strict; Sealing problems of metal pipe joints, such as uneven gaskets and cracks in joints.
fuel injection nozzle problem : the needle valve of the fuel injection nozzle is stuck, the oil outlet valve is not tightly sealed, etc., resulting in high-pressure gas backflow into the fuel supply line.
oil return pipe problem : the oil return pipe joint is not tightly sealed, and air enters through the oil return pipe.
Tank problem : There is no oil or insufficient oil in the tank, and air is sucked into the oil circuit.
filter problem : filter shell deformation, seal is not tight, etc.
Specific treatment methods
Replace the aging or damaged tubing : if the rubber tubing is aging, it is recommended to replace the new original rubber tubing; Metal tubing check joints for sealing problems and replace gaskets or joints if necessary.
Inspect and replace damaged parts Inspect the fuel injection nozzle and oil outlet valve to ensure that they are properly sealed; Replace damaged filters and seals.
exhaust operation : Operate according to the fuel supply system in stages, remove the air one by one to ensure that the oil circuit is unimpeded.
Regular inspection and maintenance : Regularly check the oil pipe, filter and other components to ensure that they are in good condition to avoid air entering the oil circuit.
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