Fri, 04/15/2011 - 11:23
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New to the forum. I am replacing the inner seal on my 1983 r80rt 37:11 drive. it has leaked oil into my drum brake since i have owned it. I cleaned the drive and ran it with a power drill to find the oil coming from the center axle hole. My axle is covered in oil and it is leaking to the outside aswell. I got the new seal from Benchmark Works. I have tried to find articles on this but everyone seems to be replacing the spline seal instead. Is the bearing i have to remove an interference fit? i have access to an oven at my college to heat it up. i have read to heat the drive to 300ºF-150ºC and the bearing will just fall out. Any other hints would be nice. I am planning on doing this within the next 7 hours. Will the seals for the drive gear be damaged from the heat? Will the oil smoke in the oven? (this would not be conducive for an engineering lab environment).
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Tue, 04/19/2011 - 18:37
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I washed the oil out with kerosene and through it in the oven. at about 275ºF the bearing dropped out. I yanked the seal and used a thin wall pipe to put in the next one. i reheated the case for 2 minutes and then dropped the now cold bearing back in. i made sure to put it back in like it was. you only get one shot since the bearing swells so quick. it did not smoke or catch fire. i have driven it 200 miles and my back brake is dry and functioning. i also did that speedo fix where you tap the magnet shaft with a hammer to displace the magnet a few thousanths. now my speedo is dead on. i am in high cotton now!
The oil will definitely smoke and the seals will likely deform.
Although I'm not familiar with the specifics of your final drive, this is a very common way for BMW to assemble things.
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