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Old 03-18-2013, 09:18 PM   #1
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Default Gear Diff maintenance

I have Tamiya white TRF 417 gear diffs which i purchased 6 months ago. I am using #300000 oil in the front and used #900 for the rear a few months back and now am using #3000 for the rear. However i find that after a few runs, oil leaks from the sides of output shafts , only for the rear diffs.
I took the rear diff apart and think i found the problem. The o rings for the output shaft is gripping the shaft tightly, but the o-ring itself is rotating inside the gear diff housing. I was thinking of putting some silicone sealant in between the o-ring to prevent it from rotating, which i beleive is the cause of the oil leaking from the out drives. Any thoughts from the more experienced members?
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Old 03-18-2013, 10:26 PM   #2
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Replace the o rings.
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Old 03-18-2013, 11:45 PM   #3
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What he said and also put some associated green slime on o-rings before installing.
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Old 03-19-2013, 06:56 PM   #4
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What he said and also put some associated green slime on o-rings before installing.
Thanks Josh, i always put green slime on but doesnt seem to help for long, its supposed to keep the friction low between the outdrive and the o-ring. But somehow the oring still spins. I am not too sure how long will a new o ring last, but some racers i know said they put some clear soft silicone sealent on the outer part of the oring that fits into the case. I did it last night and it should cure completely by tonight. lets see if it works or not.
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Old 03-19-2013, 09:39 PM   #5
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Alcyon, let us know how it works out for your using the sealant to hold the o ring in place. I have read of guys carefully CA gluing the outer o ring edges into the diff housing to accomplish the same thing you are trying with sealant.
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Old 03-19-2013, 10:59 PM   #6
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Kyosho 5mm orings will solve all your issues
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Old 03-20-2013, 02:18 AM   #7
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Alcyon, let us know how it works out for your using the sealant to hold the o ring in place. I have read of guys carefully CA gluing the outer o ring edges into the diff housing to accomplish the same thing you are trying with sealant.
hmm good idea. i may resort to that if this doesnt work.
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Old 03-20-2013, 03:27 AM   #8
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Kyosho 5mm orings will solve all your issues
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Old 03-20-2013, 06:29 PM   #9
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I am glad to report that the 24 hour silicone cure works..so far, i inserted the outdrives into the diff housing while pressing a SMALL end of the box wrench against the o ring, as a precaution to prevent it from coming out. After that i spin the outdrives ..and the o ring doesnt turn at all. Oh yes, i did put on green slime. However, the friction between the outdrive and o ring is higher now, so to compensate, i use the #900 oil that tamiya supplied with the diff set. Its too early to tell now if the diff will not leak becuase i have not tested it at the track yet, but so far seems to be holding up.
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Old 03-20-2013, 10:12 PM   #10
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Quote:
Originally Posted by narcotiks View Post
Kyosho 5mm orings will solve all your issues
Do you happen to have a part number buy any chance?
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Old 03-21-2013, 12:03 AM   #11
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Do you happen to have a part number buy any chance?
From memory i'm pretty sure its ORG 05.
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Old 03-21-2013, 02:26 PM   #12
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Quote:
Originally Posted by narcotiks View Post
From memory i'm pretty sure its ORG 05.
Thanks, I think I found them.

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Old 03-23-2013, 09:30 PM   #13
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Alcyon, let us know how it works out for your using the sealant to hold the o ring in place. I have read of guys carefully CA gluing the outer o ring edges into the diff housing to accomplish the same thing you are trying with sealant.
I glue the o ring and it definitely stopped most of the leakage.. Spec r gear diffs work but as far as I know everyone that has used a spec R diff had leaking problems
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