Failed Shaft to Final Drive Seal
Has anyone had the seal between the shaft and final drive sump fail? My shaft area won't hold oil and I'm getting obscene estimates to replace that seal. The part itself is about $10.50 but I'm getting $350 estimates! Can it be done by a do it yourselfer or is it a case of get out the credit card, sign on the dotted line and don't look?
That is a toss up question. You can do it yourself, but if you make a mistake, the result might be dangerous and expensive. In pure corn country farmer theory, If you take something apart and put it back together in precisely the same way, no problem. I know more than a few riders who get away with that sort of thing, myself included.
The nut on the pinion portion of the FD is torqued to something like 150 ft/lb, and you'll need a special tool to lock up the FD to loosen it and re-tighten. Then there is the question of shimming the pinion to the ring gear so that they run together correctly. If my memory serves me correctly, I have done this before, farmer style, but I no longer recall the order of assembly with regard to exactly where the seal is located in the maw.
At the national rally in Sedalia, a guy showed up with a FD where the pinion nut had loosened up a bit. The FD was destroyed.
You might be opening a can of worms there.
Mine failed on my R90S. A friend and I rode the bike to our local airhead specialist and dropped off the bike and went to lunch, about 2 hours later it was done. I believe it was about $200, or slightly more. He installed the seal and a plastic crush washer, refilled both driveshaft and final drive. That was about 2 years ago. As others have said, it takes a couple special tools that I do not have, and a really big torque wrench, which I also do not have.
You could remove the final drive and take it in for repair. Buy a new gasket and reinstall it yourself then add the gear oil. Always good to state the year and model of the bike.
Thanks everyone! I'm taking it in. Irv Seaver in Orange, CA is sounding much more reasonable (1 hour of labor). Whew!