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Old 07-01-2014, 01:01 PM   #1
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Default Gear diff issues

I run a Spec R S1 touring car and recently bought some replacement carbon diff gears as I had both front and rear gears fail at the same time. This is not the first time I've replaced the gears in my diffs. At the same time I bought a new HD diff which I installed in my car. I have used this now for 2 meetings and have noticed already that the diff gears have worn causing the diff to fail, only rotating from one side. This failure caused a lot of heat which over 2 races caused two wheels to break. One wore the hex fitting, and the other melted the centre hole. A photo is attached. The hex fitting and wheel nut got extremely hot. The diff has 1,000,000 thickness oil in.


Prior to this, I also noticed that my existing diff had seized which when I opened it up I noticed that the casing had worn causing the shims to lock, preventing the diff from moving at all. This was also difficult to strip down. I have also attached a photo of this as well.

Has anyone else experience this, and does anyone know what might be the cause.
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Gear diff issues-img_20140627_171412824_hdr.jpg   Gear diff issues-img_20140629_090417388.jpg  
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Old 07-01-2014, 02:30 PM   #2
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I have no idea how the hex and axle is spinning inside the wheel. I suggest having someone at your next meet look at your car. Possibly something is binding, but

I also find it quite strange that both a front and rear diff would fail at the same time.

Are you parking against a board and jamming the throttle?
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Old 07-01-2014, 04:44 PM   #3
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what motor are you running? battery 2s?

I've only seen wheel hex fail like only when they get bolted crossed over on the hex or get jammed by the a arm or hinge pin or something. Looks like something was hitting the inside spokes.
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Old 07-01-2014, 08:08 PM   #4
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from experience, melting or rounding the hex on the wheel is due to a bearing failure and not the diff... if the bearing is bad, wheels won't turn freely adding strain to the planetary gears in the gear diff too...
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Old 07-01-2014, 08:15 PM   #5
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The wheel issue is not related to the diff at all. I'm not sure what car your'e running but find the thread on it and see what they have to say. Both are similar in the culprit being simple fitting and proper shims/collars etc. Your'e missing something simple, keep mucking with it.
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Old 07-01-2014, 10:54 PM   #6
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Quote:
Originally Posted by samnelso View Post

I also find it quite strange that both a front and rear diff would fail at the same time.
Im assuming you are building the diffs wrong. if they fail the same time. What is the actual process you go through
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Old 07-02-2014, 01:59 AM   #7
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Thanks for the responses. I'm happy with my diff building, although the front one jamming was as a result of an extra shim after the front gears failed. I was hoping for better meshing but it jammed causing the casing to bind and wear away. I think the bearing might be the solution, I'll check that out. Doesn't explain why its turning from only one side though. That suggests poor meshing caused by gears wearing to me.
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Old 07-02-2014, 02:08 AM   #8
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Its one side coz one of your wheels is not rotating freely.
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Old 07-02-2014, 02:10 AM   #9
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Quote:
Originally Posted by 32819toon View Post
. That suggests poor meshing caused by gears wearing to me.
so what is youre actual process of building the diff. Do you sand gears? how many shims under the crown gears etc.

I have 5 spec r gear diffs that I use to run in the TCX and only 1 of them failed after a big crash. Everyone of them is still working flawlessly.

[YOUTUBE]https://www.youtube.com/watch?v=k1PfllEfx3A[/YOUTUBE]
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Old 07-03-2014, 06:00 AM   #10
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Is there a V2 diff upgrade? Thought I heard of one, but I don't use the Spec R to know about them.
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Old 07-03-2014, 08:19 AM   #11
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Dude, you have to get some grammar right.

The way I see it, your wheels locked for some reason and that caused the diff to blow. Otherwise I can't see how the hex would round the wheel fitting.
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