After replacing the four-part assembly, it is necessary to readjust the valve clearance. This is particularly important and must be done. It is recommended to adjust the valve clearances and then check for faults in the components I have mentioned below:
White smoke means insufficient combustion. This happens if the water temperature is low or high. This is normal.
Blue smoke means the engine oil is burning. To exclude parts that may allow oil to enter the cylinder: cylinder seals, valves, oil rings and turbochargers (you do not need to check this if they have not been disassembled)< /p>
You said the oil comes out of the exhaust gas area, which means your cylinder is coming up gassy. The gas ring, valve or cylinder seal may not be properly sealed.
If a cylinder does not work, it meansthat a cylinder is missing. Check if the oil nozzle is blocked and if there is a problem with the oil pump.