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Old 10-29-2009, 05:51 AM   #1
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Default Smelling diff oils

Hi all,
I have just stripped my car for a routine rebuild, and noticed that my diff oils stink!! Kind of like rotten eggs! They are black so are definatly ready for a change, but is the smell normal?
I cannot remember if they smelt like this on my last car, but this is the first time I have stripped my 801XT to redo diffs.

So basically, is it normal for the diff ols to smell? If not then how do I change it?
Thanks
Scott
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Old 10-29-2009, 06:27 AM   #2
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Actually this is something I noticed to when rebuilding my cars. You are not the only one.
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Old 10-29-2009, 06:34 AM   #3
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it is a good idea to change your diff and shock oils ever couple weekends atleast i redo then every week and redo my shocks befor every main and if i have time my diffs alos it is a good habit to get into so things domt weare as much and the car will handel more consistantly
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Old 10-29-2009, 07:24 AM   #4
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I change my diff oils on average every 2-3 races which is more frequent compared to alot of people.. It doesn't smell bad enough to clear out a room, but definitely has a smell.
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Old 10-29-2009, 08:45 AM   #5
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I mix axe body spray with my diff fluid to keep them from geting too stinky.

Diff fluid should be changed before it gets cooked. I use the AE fluid it seems to work well and is cheaper than Mugen/Kyosho. Ofna fluid didn't work too well for me.
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Old 10-29-2009, 09:16 AM   #6
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yep - same here, they stink pretty badly, even after a "normal" use period (say, 2 hrs). I don't think it's just about the silicone "cooking" but rather about outside organic matter getting in (would be the case if you run in natural dirt with a lot of fine dust like my hometrack) and then contaminating the oil, further helped by the heat of course. Typically, smell goes with brownish/dirty looking oil.

Interestingly enough, the shock oil doesn't stink... and is clear in most cases, except the left rear.

You are NOT the only one. Be reassured.

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Old 10-29-2009, 02:38 PM   #7
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Quote:
Originally Posted by lazyboy12300 View Post
Hi all,
I have just stripped my car for a routine rebuild, and noticed that my diff oils stink!! Kind of like rotten eggs! They are black so are definatly ready for a change, but is the smell normal?
I cannot remember if they smelt like this on my last car, but this is the first time I have stripped my 801XT to redo diffs.

So basically, is it normal for the diff ols to smell? If not then how do I change it?
Thanks
Scott
Scott,

What you are smelling is normal for "cooked" Silicone fluid. Especially on the Tamiya's the rear diff runs quite a bit hotter than the front or center. I pull my diffs down every weekend and just peak inside. If the fluid smells or looks to be tuning grey I will change it. If the next weekend after changing fluid it looks grey again, I will change the Sun & Spider gears.


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Old 10-29-2009, 03:01 PM   #8
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thanks for all the tips. Think i will just start changing diff oil more often.
Thanks for all the help
Scott
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Old 10-29-2009, 04:00 PM   #9
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Quote:
Originally Posted by Zerodefect View Post
I mix axe body spray with my diff fluid to keep them from geting too stinky.

Diff fluid should be changed before it gets cooked. I use the AE fluid it seems to work well and is cheaper than Mugen/Kyosho. Ofna fluid didn't work too well for me.
+1 on the axe that stuff is awesome!
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Old 10-29-2009, 04:04 PM   #10
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+1 on the axe that stuff is awesome!
i mix a little bit of febreeze in mine and they smell great at the track! tons of people compliment the smell of my diffs! i personally like the berry smell best
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Old 10-29-2009, 04:16 PM   #11
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Did you guys see the ad at the bottom of the page??....WTF... Why not leave it be, at least that way you can tell where it is. Don't doctor it up .com
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Old 10-29-2009, 04:18 PM   #12
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Yep the smell is defiantly normal. I am sure I am not the only one who noticed but the thinner oils go bad/leak out faster. I keep a chart on my maintenance. for diff oils in my little notebook I carry. I change fluids 1-4k every 1.5 hours 5-7k every 2.5 hours and 8+ every 3 hours. Of course I am not perfect and blow past those times alot but if its been over that time I change them. But I always change them before a trophy race.
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Old 10-29-2009, 04:20 PM   #13
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Quote:
Originally Posted by Joey Platinum View Post
Did you guys see the ad at the bottom of the page??....WTF... Why not leave it be, at least that way you can tell where it is. Don't doctor it up .com
This junk is for real.
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Old 10-29-2009, 04:27 PM   #14
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bump
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Old 10-29-2009, 04:35 PM   #15
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Darn, Joey, its gone this time. These ads change from one time to the next.....

I wanted to click it and see what else it said....
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