pinion stripped threads

[MPKOCHER]

my pinion just got all of the teeth stripped off of it. i should have known that was going to happen cause it wasn't lining up right. can anyone tell me why it wasn't lining up right and give me some advice on how to put the new one on and not run into the same problem thank you.

 

[Revolauncher]

The chassis inserts for the motor mount could have been faced wrong direction. The Center diff. mount might have moved on you, the center diff. bearing might have failed, there are a half dozen possibilities. I find when setting mesh it pays to give the whole thing a wiggle with the bolts just started, and then give the drivetrain a spin with the wheels in the air. It should spin, freewheeling with no noises....

 

[myrcbud]

Is the chassis bent? Are you using a zenoah fan cover?

 

[crankestein]

Did you do the paper gap pinion to spur gear test?

Its trial and error w gear mesh, almost like a black art, lol.

This is how I get it set;

Blue threadlock w a few drops of red to the bottle, medium strength. Install bolts on the engine, secure but not completely tight. Then I roll the chassis on the floor pushing it by hand, going easy and letting the engine sit, like the spur gear will push it and make it right. The engine has to be somewhat secure but not complete.

Then criss cross, easy, roll, cc, roll, and tighten all the way down. A few silly drops of thin light oil, 25w shock oil, 3in1. Just a bit, roll and see if is still binding.

Factors to check;
Clutchbell bent
Clutchbell bolt bent
Clutch gear out of round warped
Spur gear warped, rare
Dirt or oil underneath engine or where the spacers go
Barely stripped bolts, fatigued, swap as necessary
Low quality clutch gear, buy brand only


You did not specify what brand the gear is. I will say, I installed a Rovan 19t on my X2.and lasted half a tank. Now I am running Losi 19T and spacers, no more issues.
Once all nice and tight, take it cor a spin and bring w you the allen wrench, bring it back, tighten, another spin, jump it, check, push roll it see how it sounds.

If you still have problems redo everything, and check for bent parts, loose stripped bolts on center diff housing, chassis flex.

Two things I always check when driving the damn monster, carb is not loose and proper mesh.