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Thread: Changed The Pinion Seal Today

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    200+ Posts lgjhn's Avatar
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    Default Changed The Pinion Seal Today

    As I stated in other posts, I've had a slight diff pinion leak on my RS for awhile now and decided last night that today I was going to fix it. I let the diff drain overnight. I had bought a new seal awhile back (National 8181NA) and waited till the winter rainy season to do this. Got it up on the lift, jacked up the back, pulled the left side tire off, and got a light up in there and went to work. I counted the threads showing on the nut, marked everything so I could get back to the exact same point before starting. I come to the conclusion that my leak was coming from the splines, nut, washer area in the yoke, but I went ahead and changed the seal anyway. I probably could have gotten away with just re-RTVing the nut/washer.

    Just an FYI: IF you have an actual seal leak, it's most likely going to run down along the bottom of the diff and then back towards the drain plug area. IF you have a spline/nut/washer leak, it's most likely gonna be a very slight leak over time like mine was and will drip off the u-bolt nuts given the way this diff is designed. I got it all back together, dumped 3/4s of a quart of 80W90 gear oil back in her and now waiting for a dry day so I can test ride it. Spinning the wheels while it was jacked up, it felt smooth and, so far, no leaks. But until I get some miles on her, I won't know for sure.

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    2000+ Posts bikerbillone's Avatar
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    What year RS build was it? I've not read about this problem before, probably out there, just no report here.

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    200+ Posts lgjhn's Avatar
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    Quote Originally Posted by bikerbillone View Post
    What year RS build was it? I've not read about this problem before, probably out there, just no report here.
    Bill,

    It's a 2013 RS on an '06 Wing. There have been a few...but not very many. 2 of my friends have GW trikes with well over 100,000 miles and neither one has had any pinion seal issues. IMHO, I think mine can probably be traced back to the way the builder originally installed the driveshaft of the kit. One of the u-bolt nuts on the pinion was installed cross threaded along with no lock washer. It finally came loose on me last year causing some driveline vibration. Upon investigation, I found the loose, cross-threaded u-bolt and replaced it. Vibration went away, but shortly thereafter, the pinion seal developed a slight leak. I've been just living with it for awhile now, and decided to fix it over the winter months.

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    2000+ Posts bikerbillone's Avatar
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    Morning Larry, well that clarifies the situation, glad ya put it out there.

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