GL1000 final drive fluid overflowing?


Information and questions on GL1000 Goldwings (1975-1979)
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Ducman
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Joined: Wed Mar 23, 2016 12:36 am
Location: Calgary AB
Motorcycle: 1976 GL-1000

GL1000 final drive fluid overflowing?

Post by Ducman »



1976 GL1000. The previous owner said the only thing I should do is the final drive fluid. He didn't do it because he didn't ride much at all, which is true. First, I removed the fill bolt and very used black oil started overflowing out of the fill hole. Maybe 15-20ml overflowed out.
Then I removed the drain bolt and let it drain completely with some wheel rotation to remove what I could. I have only drained clean gear oil so it was different to me.
So what would cause overflowing out of the fill hole? Theoretically the level of the oil shouldn't be above the bottom of the fill hole... I doubt it was overfilled?
Maybe the metal gears/splines shed some metal and the volume of metal + gear oil was above the level of the fill hole?

What do you think happened here? Just a overfilling many miles ago with viscous gear oil on a cold Alberta winter night, and impatience to let it drain to the bottom of the fill hole?


You can read how specific I am below, if you care, for amusement.
After draining the old, used gear oil...
Then I fit the drain bolt finger tight, filled with Mobil1 90 weight gear oil, fit the fill bolt finger tight and rotated the wheel by hand for 2 minutes to rinse as much as possible. I then drained it, it was a bit dirty, so I refilled with more gear oil and rinsed it again. It drained clean, I shouldn't have drained this refill. Too late now, so I refilled with fresh gear oil until the oil level reached the bottom of the fill hole, torqued the bolts to spec and I'm done.


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Aussie81Interstate
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Re: GL1000 final drive fluid overflowing?

Post by Aussie81Interstate »

What you have done is fine, maybe the last person filled it up when it was freezing outside-- who will ever know.

When you drained it out - had the bike been running at all - running could have heated it up a bit causing a bit of expansion - then when the top filler bolt released there was a small overflow.

Personally I would have flushed with some kerosene twice after rotating for a few minutes each time - then put a small amount of gear oil in - a little bit of rotation - drain that out - then fill it up with new oil - done.
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ct1500
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Re: GL1000 final drive fluid overflowing?

Post by ct1500 »

The previous fill was likely done leaning over on the side stand instead of straight up.
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dingdong
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Re: GL1000 final drive fluid overflowing?

Post by dingdong »

ct1500 wrote:The previous fill was likely done leaning over on the side stand instead of straight up.
I agree with side stand overfill.
Ducman
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Joined: Wed Mar 23, 2016 12:36 am
Location: Calgary AB
Motorcycle: 1976 GL-1000

Re: GL1000 final drive fluid overflowing?

Post by Ducman »

Good thinking people, the side stand fill is the most logical explanation.
Thanks!


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