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Old 03-12-2009, 06:24 AM   #1
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Default Wobbly TC4 spur gear

Hi,

I was cleaning up my new-to-me TC4 last night, and took the spur gear off. When I put the spur back on I noticed that it's wobbly, like it's distorted or something, as if the bearing is worn out. I tried putting a new spur on but it wobbles too, but not as much.

I put the input shaft in the car without the spur on it and it seems to be fine. I'm thinking it might have something to do with how I screwed the spur gear to the spur gear hub. Is there some specific way to do it so you don't warp the gear? I tried my best to tighten each of the three screws a little at a time so there wasn't one that was way tighter than the rest.

Any ideas what causes this or what I can do to fix it?

Thanks,

Craig
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Old 03-12-2009, 06:55 AM   #2
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Craig, the screws should be done up in a criss cross pattern to avoid distorting the spur and should not be overtightened. Some spurs also have larger holes than needed and a small tolerance centre hole where they fit on the boss to help with running true. Some spurs unfortunately are just poor quality. If you can test the spur for flatness before fitting it would help. I also test the spur turns true after fitting on the spur holder, but without any of the screws on. If it doesn't spin true, there's something wrong (can be too tight a fitting on the boss which distorts it).

With your car I would also check the bearing holders in the gearcase are not worn out.

Hope this helps.
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Old 03-12-2009, 10:13 AM   #3
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I am using three screws to hold the gear on, should I use six?
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Old 03-12-2009, 10:06 PM   #4
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If the spur holder allows it, sure, it's a good idea. But don't start drilling and such if you don't already have the holes there.
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Old 03-12-2009, 10:24 PM   #5
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If you dont put the spur gear back on the same 3 fingers that it was on the first time and use the other 3 sometimes there is a burr form the firs set of threads that the great will site on. I noticed that when I tried to use a 2 screw RR gear on my tc4. Check the face off the spur holder. Scrape it with an exacto if necessary.
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Old 03-17-2009, 07:40 AM   #6
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If you've got the Factory Team version make sure you put in the plastic block that sits between the engine mount and upper deck in the right way. I put mine in upside down once and the spur moved around quite bit
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Old 03-18-2009, 10:36 AM   #7
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It's not the Factory Team version, just the regular version.

I took a closer look at it and I think it's the spur gear hub, the piece that the spur gear screws to that is messed up. I put the car back together without the spur gear on it, and when I spun the rear tires a watched the spur gear hub. Sure enough it was wobbling!

I'll see if I can pick up another one of those, but I'll bet my LHS/Track doesn't stock them. Oh well, just gotta wait if they don't.
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