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Discussion Starter · #1 ·
According to Okie, who's about done with the bike, the final drive is only draining and refilling with about half the oil specs say it should have. I remember when I bought the bike the PO was so proud of the grease zerk on the shaft that he tried to use it as a selling point and I'm wondering if he pumped an entire cartridge of grease into the thing and it somehow got past where it's supposed to be and into the box itself?



Is that possible?



Okie's going to flush out the drive box with solvent this weekend and see if there's any change in how many ounces it takes to refill it again. Sound like a logical route or could we have some other problem I can't fathom?



No noise, no slack or anything from the box and by looking at the parts pix I can't tell if an extreme excess of grease could cause this problem.
 

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I don't think grease could get into the final drive unless someone, in ignorance, thought it appropriate to put it into the oil fill port. If way too much time is spent at the the "zerk" fitting, the right side of the swingarm would fill until grease oozed out forward from around the rubber "boot". That would take a lot of grease.



Flushing is probably OK with a mild solvent (I'd use kerosene or maybe jet/diesel fuel) that won't do anything bad to the internal seals. Thngs like acetone, lacquer thinner etc would not be good. After the flush I would refill with proper hypoid gear oil, work/rotate the unit for a while on the center stand, drain and then fill again. The idea being to make sure residual solvent has all been eliminated before going out on the road and putting any real loads on the unit.



Hoppy
 

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Maybe someone has filled the diff with grease?? 30 years is a long time, and a lot of PO's.

(Previous Owners) Wouldn't be hard to whip off the fill plug and squeeze grease in.



Would be really hard to clean out, if it is. You can strip them down, but it's a little time consuming. Probably get a 2nd hand one easier. I'd be worried if it only takes half the required amount of oil.



My 10 cents.
 

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Discussion Starter · #5 ·
It's going to be a lot easier to try to clean it out with some solvent while still on the bike, although if it's really that messed up there could be some internal wear. Doesn't seem to have any slack in it that I remember, we'll see what he comes up with when he tries to clean it out but he won't be doing any work on it this weekend, some big bike rally of models from 1912 and before is coming through the state and he's going to attend.
 
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