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In this video, we disassemble the Yukon engine to fix the oil leakage problem and solve the white smoke problem. On the way, we discovered a problem. Let's see what the Yukon is. It is a car that has a special place in my heart. I bought the car new 14 years ago and I have traveled to many countries. It has never let me down, but after a long time of use, suddenly and without warning, the transmission broke down. The transmission started making a sound and stopped moving in second and fourth, and even the reverse gear broke down. So I decided to also have white smoke coming out for a while. I tried to fix this problem and changed the evaporation valve and cleaned the valve cover, but to no avail. The initial diagnosis of the problem is that the valve bushing or the valve oil seal has started to leak oil. There is also an oil leak between the transmission and the engine. In general, it seems that the Yukon needs a complete maintenance, so I decided to take the transmission and engine home and do a complete maintenance. V8 5.3 Vortec LY5 and a four-speed transmission 4L60E #Black_version #GMCBlackEdition #BlackEdition #Yukon #YUKON #GMC #LY5