Is it troublesome to replace the valve oil seal?

Is it troublesome to replace the valve oil seal? Replacement is not very complicated. If it goes well, it will be done in 2 to 3 hours, mainly because it takes some time to install the oil seal and adjust the valve. Labor costs range from 300 to 500, depending on the city and the location of the repair shop. Oil seal is very cheap, dozens of pieces should be enough. Blue smoke from a cold car may be a problem with the valve oil seal. To replace the valve oil seal, it is necessary to remove the engine cylinder head according to common sense and support the valve before replacing the valve oil seal. This method is reliable, but it usually takes 2 hours to package new oil. In the second case, if there is a problem with the oil seal of only two cylinders, the method of replacing the valve oil seal without disassembling the cylinder head can be adopted. This method of replacing the valve oil seal can not only save a lot of money, but also obviously shorten the working hours. If you want to replace the oil seal of the intake and exhaust valve of a cylinder, you can hang the valve with a rope. If necessary, remove the spark plug of the cylinder, introduce high-pressure air from the spark plug hole, and then hold the valve and remove the valve oil seal. This can not only save at least 1.5 hours, but also avoid the damage of cylinder gasket, the disorder of timing and the pollution or defect of coolant when disassembling the cylinder head. @20 19