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-   -   2 gearboxes 2 gear diffs both bind? (http://www.oople.com/forums/showthread.php?t=122945)

MikePimlott 23-02-2013 08:41 PM
2 gearboxes 2 gear diffs both bind?
 
Whilst in mid motor configuration i have tried 2 new gearboxes and 2 gear diffs and when the gearbox is tightened up it binds?

ball diff in both gearboxes works fine but both gear diffs are not allowing me to fully seal the gearbox.

any ideas? ,there is no side to side movement in the gear diff so is it just too big ?

cryer-evo 23-02-2013 09:30 PM
i did find that my self just nip up gear box and run it it will free up with time

nicmo 23-02-2013 10:45 PM
just unscrew a wee bit the gearbox screws and it will be fine.

MikePimlott 23-02-2013 11:06 PM
Quote:
Originally Posted by nicmo (Post 749407)
just unscrew a wee bit the gearbox screws and it will be fine.
Yep i did that, but when you screw it into the chassis it tightens back up again.

Adyb 20-04-2013 08:11 PM
Hi,

Did you solve the problem, if so how? cos I got the same issue.

Thanks.

cunawarit 20-04-2013 08:29 PM
I had that issue, I simply loosened the screws until it freed up.

Adyb 21-04-2013 07:00 AM
Hi,

I tried that which is fine out if car. As comment above as soon you screw the gearbox to chassis it tightens up again.:confused:

Thanks.

Robby 21-04-2013 01:59 PM
Quote:
Originally Posted by Adyb (Post 767579)
Hi,

I tried that which is fine out if car. As comment above as soon you screw the gearbox to chassis it tightens up again.:confused:

Thanks.
I've had four different 22's, multiple different gearbox cases, used both balldiffs and geardiffs - and not a one of them have bound or tightened up.

My guess is that you've warped the plastic as a result of overtightening the screws. These screws only need to be snug, NOT tight (the ones into the alloy motor mount can use a dab of loctite). But once you've warped the plastic you've ruined the parts, and they have to be replaced.
Do as others have suggested and buy new gearbox halves, and assemble and re-install WITHOUT overtightening any of the screws. I'll bet your "problem" will be solved.

MikePimlott 21-04-2013 03:17 PM
Quote:
Originally Posted by Adyb (Post 767544)
Hi,

Did you solve the problem, if so how? cos I got the same issue.

Thanks.
No, the geared diff is too big for the gearbox. When the gearbox halves are screwed together it pinches the bearings and creates tight spots. The only way around it is to loosen the gearbox screws until the diff turns free, but be carefull because when you screw it back into the car it can tighten up again as the halves pull together in the blocks.

Quote:
Originally Posted by Robby (Post 767599)
I've had four different 22's, multiple different gearbox cases, used both balldiffs and geardiffs - and not a one of them have bound or tightened up.

My guess is that you've warped the plastic as a result of overtightening the screws. These screws only need to be snug, NOT tight (the ones into the alloy motor mount can use a dab of loctite). But once you've warped the plastic you've ruined the parts, and they have to be replaced.
Do as others have suggested and buy new gearbox halves, and assemble and re-install WITHOUT overtightening any of the screws. I'll bet your "problem" will be solved.
I have done this twice now and both have not been over tightened nor have any of the parts warped.

The first gearbox i noticed the lid on the gear diff had been over tightened and the plastic had "butterflied" kind of so i bought a new one, this lid was straight and it still bound, as stated above its pinching the bearings not binding on plastic.

If i put the ball diff in everything runs free.

Robby 21-04-2013 04:59 PM
Quote:
Originally Posted by MikePimlott (Post 767610)
No, the geared diff is too big for the gearbox. When the gearbox halves are screwed together it pinches the bearings and creates tight spots. The only way around it is to loosen the gearbox screws until the diff turns free, but be carefull because when you screw it back into the car it can tighten up again as the halves pull together in the blocks.



I have done this twice now and both have not been over tightened nor have any of the parts warped.

The first gearbox i noticed the lid on the gear diff had been over tightened and the plastic had "butterflied" kind of so i bought a new one, this lid was straight and it still bound, as stated above its pinching the bearings not binding on plastic.

If i put the ball diff in everything runs free.
I have geardiffs in two of mine, know of their use by countless of others with no complaints - which leaves the common denomintor being that you must be doing something wrong. Sorry, but something's just not adding up with your story.

Are you sure you're even using the correct geardiff?

MikePimlott 21-04-2013 05:43 PM
Quote:
Originally Posted by Robby (Post 767634)
I have geardiffs in two of mine, know of their use by countless of others with no complaints - which leaves the common denomintor being that you must be doing something wrong. Sorry, but something's just not adding up with your story.

Are you sure you're even using the correct geardiff?
common denominator being me + the others below who are having the issue ? and the others i have spoke to who have encountered the same thing (one being a team driver who told me to run the gearbox looser or run the ball diff)

maybe you're just special

Robby 21-04-2013 05:50 PM
Quote:
Originally Posted by MikePimlott (Post 767640)
common denominator being me + the others below who are having the issue ? and the others i have spoke to who have encountered the same thing (one being a team driver who told me to run the gearbox looser or run the ball diff)

maybe you're just special
Maybe, along with all the countless others that haven't had the issue. ;)

If a "team driver" supposedly told you what to do, I don't understand why you're asking here. :eh?:

MikePimlott 21-04-2013 05:54 PM
Quote:
Originally Posted by Robby (Post 767644)
Maybe, along with all the countless others that haven't had the issue. ;)

If a "team driver" supposedly told you what to do, I don't understand why you're asking here. :eh?:
I asked here back in February, and i only replied to this thread as it has been brought back up again 21 hours ago.

budfish 21-04-2013 10:16 PM
Quote:
Originally Posted by Robby (Post 767644)
Maybe, along with all the countless others that haven't had the issue. ;)

If a "team driver" supposedly told you what to do, I don't understand why you're asking here. :eh?:
Who cares gear diffs are for wimps

MikePimlott 26-04-2013 11:50 PM
Quote:
Originally Posted by budfish (Post 767737)
Who cares gear diffs are for wimps
Trust You lol, You know i have a ball diff as well :wub

Anyway, whilst playing tonight ready for Sunday i measured this:
http://i640.photobucket.com/albums/u...ps079ffad2.jpg

http://i640.photobucket.com/albums/u...ps6eba898f.jpg

Sorry for the huge crappy iphone pics but im a tad inebriated, Anyways i believe this to be my issue, when screwing the Gearbox up the geardiff goes tight, the ball diff does not.

Adyb 27-04-2013 12:16 AM
Hi,

Yeap I measured the same as you.. Was talking to nice TLR representative Tuesday night and he had no issues with fitting his gear diff. Then he mention he sanded down the "Top hat" side by about 0.5mm to give the diff a smoother action as it was felt the gears were just touching each other. By gently sanding this side down (800 grit) it allows the crown gear to sit closer to the internal gears.
So measured his geared diff and would you know it, it measured 17mm!!

Not had time to do it yet but feel this is the answer and root cause.
Thanks.:thumbsup:

sly 27-04-2013 06:17 AM
Quote:
Originally Posted by MikePimlott (Post 769331)
Trust You lol, You know i have a ball diff as well :wub

Anyway, whilst playing tonight ready for Sunday i measured this:

http://i640.photobucket.com/albums/u...ps079ffad2.jpg

http://i640.photobucket.com/albums/u...ps6eba898f.jpg

Sorry for the huge crappy iphone pics but im a tad inebriated, Anyways i believe this to be my issue, when screwing the Gearbox up the geardiff goes tight, the ball diff does not.

Clean your nails Pimlott :p
My din dango had the oversize problem in width even on the second batch of geared diffs. So I got a knife on it and took some material away.
What you really need is a hobao :p

MikePimlott 27-04-2013 07:44 AM
Quote:
Originally Posted by Adyb (Post 769332)
By gently sanding this side down (800 grit) it allows the crown gear to sit closer to the internal gears.
So measured his geared diff and would you know it, it measured 17mm!!

Not had time to do it yet but feel this is the answer and root cause.
Thanks.:thumbsup:
Thanks, thats a good idea :thumbsup:

Quote:
Originally Posted by sly (Post 769339)
Clean your nails Pimlott :p
Done, sorry been a long hard working week :blush:

Quote:
Originally Posted by sly (Post 769339)
What you really need is a hobao :p
Second person to say that in 2 days :lol:

Spencer Mulcahy 27-04-2013 08:14 AM
Quote:
Originally Posted by MikePimlott (Post 769350)
Thanks, thats a good idea :thumbsup:



Done, sorry been a long hard working week :blush:



Second person to say that in 2 days :lol:
Hobao H2 car number 673 in the Pimlott garage :p

sly 27-04-2013 09:31 AM
Quote:
Originally Posted by Spencer Mulcahy (Post 769354)
Hobao H2 car number 673 in the Pimlott garage :p
http://i266.photobucket.com/albums/i...ps80fe00b6.jpg
Doesn't surprise me.

MikePimlott 27-04-2013 11:36 AM
Quote:
Originally Posted by Adyb (Post 769332)
Hi,

Yeap I measured the same as you.. Was talking to nice TLR representative Tuesday night and he had no issues with fitting his gear diff. Then he mention he sanded down the "Top hat" side by about 0.5mm to give the diff a smoother action as it was felt the gears were just touching each other. By gently sanding this side down (800 grit) it allows the crown gear to sit closer to the internal gears.
So measured his geared diff and would you know it, it measured 17mm!!

Not had time to do it yet but feel this is the answer and root cause.
Thanks.:thumbsup:
Worked a treat, get it done :thumbsup:

there are 8 small circle indents on the "top hat" bit and i sanded until they was flat. Internal gear mesh is good still and the gearbox casing is now tightened up and its spins free. no more drag.

J.Phelps 28-04-2013 06:07 PM
Any chance of getting a pic of what you sanded?

MikePimlott 28-04-2013 06:15 PM
Quote:
Originally Posted by J.Phelps (Post 769721)
Any chance of getting a pic of what you sanded?
Yep

http://i640.photobucket.com/albums/u...ps6dc09135.jpg

Sanded this down till the surface was flat. (this is my spare, the sanded one is in the car)

Ran the car today aswell and all worked good :thumbsup:

Moose 16-05-2013 01:05 PM
That works but makes the diff itself a little tighter...
I didnt want to open the diff again as it was freshly built so I took a knife and cut off some plastic in the inside of the gear box on both sides where the bearing is. Maybe it would be easier with a dremel but it was late at night and I needed to make it work.

Razer 16-05-2013 08:43 PM
I just started driving... Solved itself that way:-P


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