![]() The biggest challenge was getting off the 30 mm nut. Best Wishes to all of the home mechanics wishing to replace this seal. ![]() This job is a bit of a pain, but very doable. But when I compared the seals on the yoke, the Auto Zone cheap seal was much too tight. The Auto Zone seal is called a differential seal, so it was for another application that could be used on the Getrag transmission. That seems like an easy choice, but I purchased both. The BMW seal cost $25, while the seal from Auto Zone cost $3.85. Also let me say that there were a number of different places that sold rear seals. From that point on, the work becomes more easy. I had to put oxy acetylene heat on the nut to get it loose. Getting the nut off requires a 30 mm deep 1/2" drive socket. I would down load pictures of the tool, but the website says that the file is too big. I used angle iron to drill holes and ran bolts thru the tool to the yoke. You will probably have to make a special tool to hold the yoke while you honk on the 30 mm nut that holds the yoke to the output shaft. I used wire to tie the drive shaft to the exhaust to get it out of the way. You can then wiggle the flex disc assembly off of the rear of the transmission. If you loosen the two bolts holding the bearing housing, you can slide the front drive shaft back on the splines of the rear shaft. That gives you access to the intermediate bearing between the front and rear drive shaft. You can remove the heat shield between the drive shaft and exhaust without removing the exhaust. From the article (and a good one) Rear Main Seal Leak Symptoms: Causes and Replacement cost: 'The rear main seal is found at the back of the engine between the engine and the transmission, which seals the crankshaft’s back end from leaking. First of all, you need to remove the six bolts that hold the flex disc assembly to the output shaft yoke of the transmission. However, you can replace the rear transmission seal without removing either the exhaust or the drive shaft. My Bentley manual says that the exhaust system and drive shaft have to be removed. ![]() I just did a cam ladder reseal, rear main, upper and lower timing cover on a Eos at work. I think it pays 7 hours to do trans in and out. The main cost is labor due the trans removal. But because I'm getting old and forgetful, I couldn't recall whether I could get to the back of my transmission without removing the exhaust system and drive shaft. The rear main seal is 65 the bolts are 75¢ each. Six years ago, I rebuilt much of my suspension and replaced a lot of parts in the underside of my 325is. Now that I have replaced the rear transmission seal in my car, allow me to tell you how it turned out. ![]()
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