Rear axle leak


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Wingman70
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Motorcycle: 1982 Honda Goldwing GL1100 Interstate

Rear axle leak

Postby Wingman70 » Mon Jun 15, 2015 9:19 pm



1982 Honda Goldwing GL1100i Interstate rear axle leaking
When I removed both tires and rims and got new one, i removed the final drive shaft, drained the gear oil, wiped and cleared as much grease and gear oil as I could. I used Moly60 paste on the final shaft(both front and rear connections), and refilled the gear case with new gear oil. During my test ride tonight about 20 miles RT, i noticed an area leaking at the bottom of the outside of the final drive shaft where there seems to be a notch. It is starting to leak on the tire and is making me hesitate about riding it now. Any ideas on what is causing this(too much poly60, too much gear oil)? Any help is appreciated as i have been working on this bike since last October and have been itching to get on the road !



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tom84std
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Re: Rear axle leak

Postby tom84std » Tue Jun 16, 2015 7:02 am

Excuse me for asking dumb questions but I'm trying to get an idea where you are with servicing things.
It takes a thin coating of moly 60 on the splines. I could see putting a large excess on and some of it slinging out. Could that be a possibility?
You removed the drive? When you refilled, was it reinstalled onto the bike? Did you fill to the level opening. I'm asking to try to determine whether it's been overfilled or not. There's not a trend or big history of rear drives leaking but it's only a machine and you could have one which is leaking. Can you clean everything up, sit the bike level and fill to the proper levels. Run it and keep an eye on it? Those seals are engineered to not fail and I've never heard of anyone having trouble, but it's an antique part.

Wingman70
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Re: Rear axle leak

Postby Wingman70 » Tue Jun 16, 2015 9:31 am

The only question that is dumb is one that is not asked. :) I might have misread and packed the gears with the Moly60. So i guess i can just let it work itself out or take the rear wheel off and clean out the majority of the Moly60 in the final drive. When I refilled the gear oil, it was on the bike with the center stand down and filled it level with the fill opening. When I returned from my ride, the fluid leaking out was a grayish color which would be the same as the Moly60. What cleaner would be good to use to remove it from the tire until it works itself out of the system to the proper levels?

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Re: Rear axle leak

Postby WingAdmin » Tue Jun 16, 2015 9:41 am

I think you're on to the problem. The Moly paste requires a fairly thin layer, not packed solid with grease, and it's being flung out.

Any solvent that is safe on tire rubber will clean it off. Brake cleaner would be my choice.

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tom84std
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Re: Rear axle leak

Postby tom84std » Tue Jun 16, 2015 3:48 pm

Wingadmin's brake cleaner suggestion will do the job for the heavy paste you've got to remove now. For everyday cleaning of the bottom half of my bikes I like to use engine degreaser aerosol spray. I swear I smell diesel when I spray it. It doesn't harm the paint or the bare metal but it's a good solvent for the greasy stuff. Available in the Gumout brand, or available in the store brands for a few dollars less per can, it's the same stuff. Spray it on. Let sit a while. Scrub around with a brush. Rinse. Good cleaner and it does no harm.
Do NOT use the Castrol orange-based cleaner, or any other orange based cleaner for any motorcycle. I found out the hard way that it oxidizes aluminum and turns it milky white. It cost me several hour's work to remove the effect of that stuff.

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Re: Rear axle leak

Postby WingAdmin » Tue Jun 16, 2015 4:02 pm

The reason I suggested brake cleaner is because I know it is designed to not harm rubber (lots of rubber parts on your brakes), and he wants to remove the grease from his tires.

I don't know if engine degreaser will harm rubber tires or not.

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tom84std
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Re: Rear axle leak

Postby tom84std » Tue Jun 16, 2015 7:44 pm

WingAdmin wrote:The reason I suggested brake cleaner is because I know it is designed to not harm rubber (lots of rubber parts on your brakes), and he wants to remove the grease from his tires.

I don't know if engine degreaser will harm rubber tires or not.

Oh no, I wasn't questioning your suggestion. But for everyday stuff I've really come to appreciate engine degreaser. It cuts crud quite well, even old layered stuff. It's always been very mild on paint, plastics and rubber, never harming anything. Pretty much the best of both worlds as far as I can tell.
I used it on an old Southbend the other day. A total of about six cans by the time it was really clean. That thing had decades worth of crud built up on it. Used a stiff plastic bristle brush and it melted everything down. It was far worse than any of my bikes have ever been.


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littlebeaver
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Re: Rear axle leak

Postby littlebeaver » Fri Jun 19, 2015 7:37 am

I made the same mistake,,, I put too much paste in,,, it was sling happy, it dripped as described.... redo and you are good... I thought I got a bad batch of molypaste 60 or something, didn't know it would liquefy like that... :shock: It was at that point I thought about using the locktite Moly stuff which I am told does not
sling off like that..... But I have stuck with Honda Moly 60 just to be safe.. :shock: All I ever do anymore is get on the bike and ride it.... It will take me anywhere in the Nation...

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aznyaz
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Re: Rear axle leak

Postby aznyaz » Mon Aug 03, 2015 7:53 am

I recently replaced my rear tire ( I've done it several times) and I noticed gear oil dripping from the open lip at the bottom of the drive. This IS gear oil that is leaking, not Moly paste. Any suggestions as to why it's leaking?

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Re: Rear axle leak

Postby aznyaz » Mon Aug 03, 2015 12:30 pm

Well, I've read through the previous posts on this topic and saw that the moly paste can liquefy. If this is the case it may just be a case of moly past overload, again! I took a whiff of it and it sure smelled like gear oil but I will re-check to be sure.

I really held back on the moly this time but I guess not enough. I'll keep my eye on it.

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Re: Rear axle leak

Postby WingAdmin » Wed Aug 12, 2015 1:25 pm

Is your gear oil level in the final drive lower than it should be?

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aznyaz
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Re: Rear axle leak

Postby aznyaz » Wed Aug 12, 2015 2:19 pm

I have not checked the gear oil level yet. I'm sure if I've lost enough gear oil I would be able to tell by checking the level.

I cleaned up the mess on my rim thinking that it was just a temporary situation. After my 30 mile commute this morning there was more oil(?) on the rim, but not as much as before. It's grey just like the moly paste but there's still some liquefying going on. It's hard to believe the moly can do that. I will compare the gear oil and moly paste smells to try and differentiate. It may be a matter of all of the excess moly working its way out.

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gamartin
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Re: Rear axle leak

Postby gamartin » Wed Aug 12, 2015 3:29 pm

On both of my final drives (original and a Fleabay purchase) the gear oil was leaking thru the seals and oil ring, then mixing with the moly, so it was a little thinned out it would then sling it all over the rear wheel assembly. I don't know that I would just assume it's the moly, until you check the oil level :D

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Re: Rear axle leak

Postby aznyaz » Wed Aug 12, 2015 9:14 pm

Well, I checked the final drive oil level and it was down slightly which tells me I do have a leaky seal. What concerns me equally is that the oil was mixed with moly paste which was pretty easy to tell since it smelled like gear oil but had a grey/green appearance.

Has anyone ever had that happen, where moly paste worked its way in to the gears? Could the seals be so catastrophically bad that they would leak into the final drive? I flushed the final drive out with some gear oil but it didn't do much as far as cleaning it out. Would Sea Foam work at flushing out the paste?

I've tried to post some pics but I'm not sure if they're actually attached.

MJ
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aznyaz
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Re: Rear axle leak

Postby aznyaz » Wed Aug 12, 2015 9:15 pm

Well, at least that last question was answered.

:^)

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gamartin
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Re: Rear axle leak

Postby gamartin » Thu Aug 13, 2015 5:34 am

That lube will have a green-gray look to it.
But your pic, shows dirt suspended in the lube.
I'd flush it out with brake cleaner several times, then you could try using a mixture of lube and Lucas Hub Oil, that has worked for some. For me it just would never swell the seals enough to reseal.

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aznyaz
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Re: Rear axle leak

Postby aznyaz » Thu Aug 13, 2015 6:09 am

That pic was taken when I was flushing it with gear oil and it's a mix of paste and gear oil. The grey/green color I think is the mix of the charcoal grey color of the moly paste and the amber color of the gear oil.

I will try flushing with brake cleaner when time permits. For now it's topped off with fresh oil and I'll monitor the level frequently.

Thanks for the input.

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Re: Rear axle leak

Postby aznyaz » Thu Aug 13, 2015 11:04 pm

The final drive continues to fling a thin mixture of moly paste and oil out so I'm almost certain to have bad seals because everything I wipe off the rim smells like gear oil. I just can't figure out how the moly got mixed in with the gear oil inside the drive.

I will take the drive off, clean it inside and out, re-apply moly 60 and try the Lucas Hub Oil or something like it that a friend of mine call Swell Oil. Anyone heard of that?

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Re: Rear axle leak

Postby aznyaz » Thu Sep 10, 2015 12:29 pm

I'm slowly progressing on my final drive leak issue. I've cleaned up the inside with several cans of brake cleaner and flushed and dried it out (although it still smells like cleaner). I'm waiting for some parts to arrive before I put it all back together, but filled the final drive with hub oil. This stuff is pretty thick and I was wondering if the increased viscosity will have any adverse effects on anything (should I dilute it to start or just go with the oil as it is). I will probably drain what I've put in just to get one more flush of any excess cleaner and then fill it up again.

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Re: Rear axle leak

Postby WingAdmin » Thu Sep 10, 2015 12:33 pm

The correct oil is 75 weight, it is supposed to be quite thick. If that's what you're using, definitely don't try to dilute it!

Image

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aznyaz
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Re: Rear axle leak

Postby aznyaz » Thu Sep 10, 2015 12:57 pm

While doing searches for leaky final drives it was mentioned to use hub oil to swell the seals to reduce the leakage. I have been using 75-90 gear oil for the final drive since I've owned the bike but it started leaking after my last rear tire change. I'm not talking about diluting that.

Some of the posts I've found say to dilute the hub oil with regular gear oil and some say use full strength. Any suggestions? The hub oil is pretty thick and actually puts some resistance on the turning gears.

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Re: Rear axle leak

Postby aznyaz » Tue Sep 29, 2015 10:05 am

Just following up on this thread.

So far, I 've put well over 200 miles on the final drive since taking it off and cleaning inside and out. I put a 50/50 mix of synthetic gear oil and hub oil and have not seen any evidence of a leak. Also, was very conservative on my application of Moly paste to all splines - everything is covered with very little excess and nothing slinging off or out of the wheel/final drive gap.

The one thing that was a head scratcher was the O-ring at the drive shaft to final drive connection - both parts manual and Cyclemax site show an incorrect reference to the O-ring where it all connects. What appears to be the correct part on the final drive page, reference #36, part #91354-463-003 is too big. The correct O-ring is found on the swingarm/propeller shaft page, reference #21, part #91352-463-003 and the correct size is 47X2.5. I may be getting redundant on this point but it doesn't hurt to post.

All of the comments, as always are a great help.

MJ




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