Diff screw coming loose by itself.

[fearo]

I have a weird problem with the madrat diff and I can't seem to figure it out. I just installed a team Orion BL motor. The car ran fine for about 3/4 minutes and then it started make a high whining noise and no more power. I looked and the slipper was full on rotating and the wheels didn't turn anymore.

I inspect it and the diff screw had gotten super loose. I tighten it, the car runs fine for about ten seconds and the diff screw was super loose again.. I have no idea what causes this, or how this is even possible frankly... How the hell does a diff screw unscrew itself???

The worst thing is that I am in a cast from breaking my arm, so working on this car takes me 5 times as long as usual. Taking the diff apart will probably take hours..

Can anyone point me in the right direction? I read online that one guy tightened the diff screw with red threadlock and it helped. I tried some superglue but to no avail.

[nicefrog]

First take the screw out with the thrust bearings and see if the thrust bearings are broken or not :)

[fearo]

because I was dumb enough to fill the diff screw with super glue I almost couldn't get it out. it worked in the end, but the thrust bearings are stuck to the diff hubs forever, so I can't see if they are broken. (I ordered new diff hubs and screw)

But if the thrust bearings are broken, what can be the reason behind this?

I took the diff apart and it is 100% ok.

[nicefrog]

They just aren't very good, you can replace them with RB5 ones I think or just get the B-fast diff kit

[Battle_axe]

Fearo the thrust bearing could be the cause I would also look at the spring and the plastic part that holds the nut this has failed on me once

[Shannow]

because I was dumb enough to fill the diff screw with super glue I almost couldn't get it out. it worked in the end, but the thrust bearings are stuck to the diff hubs forever, so I can't see if they are broken. (I ordered new diff hubs and screw)

But if the thrust bearings are broken, what can be the reason behind this?

I took the diff apart and it is 100% ok.

The thrust bearings are stuck to the dif hubs! With super glue?! Is this not the problem all along?

[fearo]

The thrust bearings are stuck to the dif hubs! With super glue?! Is this not the problem all along?

No, because I poured the superglue in there as a desperate measure. the problem had occured way before that.

Can these thrust bearings break from tightening the diff too hard?

[fearo]

I'm thinking of buying the thrust bearings from here: http://www.rcbearings.co.uk/index.php?main_page=index&cPath=54

Can someone tell me the correct size I should take?

[positronic]

we've had a few thrust bearings break, and the diff just keeps loosening itself, all I know about the size is they are 1/16 balls

[Benjab]

Have a look here (http://www.modelsport.co.uk/index.php?CallFunction=ShowSpecification&ItemID=33758) the size is in the description

Edit: sorry i didnt know what a thrust bearing was