Rear Main Seal Leak

       

      Today I found an oil leak on an F 01 (a 2011 seven series) coming from between the engine and transmission. I checked it out and found it was most likely the rear main seal, so that means I had to take the transmission out. It's not super hard to do, but it does involve a lot of disassembling.
     To begin, you take off about a million screws that hold the underbody covers on, then take the heavy exhaust off. You're gonna need help from your fellow workers, because it's very heavy and awkward to remove by yourself. After that, you unbolt the driveshaft from the transmission. I always end up smacking my head on the damn driveshaft while I take all the transmission bolts out. You have been warned! Heavy jobs like this make me nervous because there's always a chance of the transmission moving the wrong way or shifting it's weight too much to one side while you maneuver it out of the car. Also, I always end up soaked with trans fluid after I pop the transmission cooler lines off from the side of the transmission and it starts leaking out. It makes the floor super slippery, so I have to be very careful that I don't fall.
      Once I had the transmission out and took the flywheel out, I found the rear main seal was in fact leaking.  In this engine (N63) the part comes as a cover with the seal already on it. I replaced the cover, cleaned the area and reinstalled the transmission. The whole job took me about six hours. 

About Myself

 

 Hi everyone,

           Here's a little bit about myself. Since I was little I have always liked to take things apart, see how they work, and fix them if they're broken. I started liking cars when I was about 15 years old. I went to college for about a year and a half when I realized what I really wanted to do was be a mechanic. I quit college and, without having any experience fixing cars, decided to leave my home town and go to UTI to study to be an automotive technician. I soon realized I had a natural ability to understand and figure out how stuff works. After doing really well at UTI (perfect attendance, many awards, 4.0 average), I went to the BMW STEP program. There were many automotive manufacturers to choose from, but BMW called my attention because of their technology and innovation combined with performance. It was definitely harder than UTI and a much different experience. Much more intense and hands on but definitely worth it if you're planning on having a serious career as a  technician. After STEP, I got hired at a dealership and have been working on BMWs for about 10 years now. It's been an incredible experience and transformation from a rookie messing up his first oil change to becoming a BMW Master Technician. Many stories to tell. Hopefully you'll visit this blog to read some of them.