Usually 120 hours.
Use two glass test tubes with a diameter of 0.5 cm and a length of 20 cm, and fill them with 19 cm of new engine oil and used engine oil. After sealing, reverse it. two tubes together and save. When the bubbles rise, if the difference between the two exceeds 20%, it means that the viscosity of the used engine oil has dropped too much and needs to be replaced.
Compare a drop of new engine oil and a drop of used engine oil on the white filter paper. If there are more black spots in the used oil droplets, it means the engine oil has not gone bad and should. not be replaced; If the engine oil is dark brown, it indicates a metamorphosis and should be replaced.
Precautions for gasoline generators
When the gasoline generator is operating, due to the high temperature generated by the componentss involved during the combustion process, gray carbon polymers adhere to the valves, valve seats and fuel injectors. , and the pistons. Failure to clean the top and other parts in time will increase fuel consumption and seriously affect the normal operation of the engine. Under normal circumstances, they should be cleaned once every 4 to 6 months.The gasoline generator engine cooling water temperature is maintained at approximately 45-65°C. If the water temperature is too low, it will cause incomplete combustion of the gasoline generator and increase the load on the machine itself. Use mineral-free “soft water” (such as distilled water, rainwater) for cooling water, and do not overuse sewage or muddy water.
As follows:
1. The battery is charged but the vehicle cannot start. This symptom is probably due to the fact that the fThe fuse responsible for starting the engine is burnt out. It should be noted that when it turns out that the vehicle cannot start. When starting, remember not to light continuously. Continuous ignition will cause the battery to continuously discharge and result in an embarrassing situation of total power loss.
2. When the vehicle is driving, the tachometer displays normally, but the speedometer displays zero, and the ABS indicator light comes on at the same time. This indicates that the fuse corresponding to the ABS is blown. Some irregular companies transport vehicles. Sometimes the fuse that manages the ABS will be removed so as not to increase the mileage, but the hidden dangers this brings are very great. A vehicle that has lost ABS will be very dangerous in an emergency.
3. If the glass water switch does not spray when you press the glass water switch, it may be caused by a foreign object blockingue the buzzard or to the buzzard which is frozen by the cold in winter. time, remember not to press the glass water switch continuously for a long time. Pressing the switch will cause the motor to overheat and blow the corresponding fuse.
Virtual connection of the fuse means that the fuse is not connected in series in the power circuit as required. Because the fuse is not reliably connected to the power circuit, the power circuit is not powered.
The power output circuit power supply is unstable and turns on and off when the fuse is not reliably connected to the power line, this will cause unstable operation or even damage to many electrical appliances.