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Twin Thumper, IYKWIM
 
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Gear oil supposed to look like this?

Hey folks. I just had a freak out moment. I'm disassembling the S to get at the transmission, so I can replace the selector shaft, which is causing sticky shifting issues. Forgot to drain it before disassembling the bike, which means I didn't get the 'box up to temperature before draining. This is what came out:



I had drained and put fresh fluid (BMW super synthetic 75w140) just a few months ago, and the stuff I drained looked and smelled like the same stuff I put in: pinkish-red, not like the pearlescent stuff we see here.

There were some metal shavings on the magnetic drain plug LAST TIME I drained the fluid, but nothing notable this time.

Any idea what's going on here?
Old 03-22-2018, 02:33 PM
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It's hard to tell the colour in the photo.....if it's got a bit of brown in it, maybe some water has gotten in? Or condensation?
If it's more like silver or brass you might have a bearing or brass shim/spacer on it's way out?

Cheers
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Old 03-22-2018, 03:47 PM
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What does it smell like? Normal gear oil smell? Anytime I get a weird fluid out, I pit dino oil in it for a few hundred miles and change it again, then dino oil and a few hundred miles till I get clean gear oil out, then fill it with synthetic. I have a mityvac to suck out to check it and I keep an eye on it.

Could be condensation, contamination, or some wear stuff.
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Old 03-22-2018, 04:37 PM
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Twin Thumper, IYKWIM
 
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From what I could see in person, it looked like two shades of pink, like a pearlescent paint. More opaque/milky than the clear-ish fluid one would expect. And here’s a bottle of the fresh stuff, for reference:



It smells quite normal (i.e. just as nasty as the fresh bottle of clean 75w140.
Old 03-22-2018, 05:04 PM
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If it smells like Updoc, you better change it!

Cheers
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Old 03-23-2018, 07:42 AM
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Milky colored = water or moisture. 2cnts fromtjs
Old 03-23-2018, 12:46 PM
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Sure looks like pulverized metal to me.
Old 03-26-2018, 04:38 AM
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Brent
 
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this is usually metal filings usually settles in the bottom of the gear box,
probably picked up when you put in the new fluid,
if you had ridden it for 6 months then it just would have been mildy dirty,
if you are very concerned about it check it with a magnet or send it in
for analisys,
but if you are having shifting problems this would be the stuff that wears off of gears, shift forks
etc
Old 03-26-2018, 06:13 PM
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Brent
 
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or your drain pan was dirty
Old 03-26-2018, 06:14 PM
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Stuff it full of sawdust, Loctite the plugs & sell it fast.
Old 03-27-2018, 10:32 AM
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Twin Thumper, IYKWIM
 
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As I mentioned, I've got a magnetic drain plug, and no metal filings were present on it when I pulled it this time. The gear shafts all seemed fine, no odd wear on any of the gears, no odd play in the bearings. The weird coloration was present as soon as it started draining on the fresh clean aluminum foil that I used to route the drip.

I'm thinking it's moisture buildup, but no real idea how that happened, or what to check/replace.
Old 04-01-2018, 06:43 PM
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My '85 K bike had similar looking oil in it a long time ago. Turned out to be the shift forks/drum wearing out. They are both "aluminum" in that transmission and have a hardened coating that, once it wears through, quickly wears the aluminum underneath. First sign was popping in and out of 2nd gear when shifting up. No metal on magnetic drain plug. Just a thought.

Frank
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Old 04-02-2018, 05:59 AM
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I'm leaning towards moisture. Sometimes you'll see something similar in the sight window. I would think that you'd need quite a lot of metal to raise a sheen like that. If you still have the fluid can you safely warm it and see if it clears?
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Old 04-04-2018, 04:16 AM
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Isn't there a rubber vent cap located on the top of the transmission? Is this damaged and allowing moisture to enter?
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Old 04-04-2018, 04:28 AM
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Look like Redline
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Old 04-10-2018, 02:15 PM
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Thats what I was thinking too. Have drained stuff that looked like that from various customer machines... Motorcycles and ATV's
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Old 04-10-2018, 04:11 PM
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Quote:
Originally Posted by EZ-RIDER View Post
Look like Redline
Looks like redline indeed. This stuff was popular at some point in the community. It's red with a flacky texture even when it's new.
Old 04-10-2018, 04:23 PM
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Twin Thumper, IYKWIM
 
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Quote:
Originally Posted by tic105 View Post
Isn't there a rubber vent cap located on the top of the transmission? Is this damaged and allowing moisture to enter?
The breather is in good shape on this 'box. Both the inside component, and the rubber cap.

Quote:
Originally Posted by Meeni View Post
Looks like redline indeed. This stuff was popular at some point in the community. It's red with a flacky texture even when it's new.
But does redline look that way when itís fresh in the bottle? Or does it look more like the clear bottle I posted above? This stuff came out looking different than when it went in.

Quote:
Originally Posted by wswartzwel View Post
Thats what I was thinking too. Have drained stuff that looked like that from various customer machines... Motorcycles and ATV's
This is heartening. I think.

I didnít take the shafts out of the housing, but I did a basic inspection of whatís visible, and I donít see any obvious wear.

Thanks guys, I think Iím just gonna put it back together and maybe change the gear oil again in a couple months, see if I get different results.
Old 04-11-2018, 10:00 AM
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