K8S Broken motor mount screws

[Hammer Down]

So this happened today...

Went to flip the truck back over and noticed this. ?

Apparently all 3 motor mount screws sheared off... I know they were intact before today’s bash sesh. Must have been the hard nose landing combined with the weight of a 3lb. 2028 smashing down vertical. ?‍

Haven’t seen anybody else do this yet. ?

 

[gotnitro]

Ahk khemm.. no vid, didn’t happen?

WTF?

 

[Hammer Down]

I might have video footage haven’t looked yet. ?

Ahk khemm.. no vid, didn’t happen?

WTF?

Still waiting on those cereal vids... ?

 

[Lride Chart]

Wow brother how did that happen???? Bash on ??

 

[KevinC]

Ouch dude. I see you still have the stock motor mount in there. Is there enough bolt left to grab with vice grips and pull them out after you remove it from the chassis?

 

[Hammer Down]

Wow brother how did that happen????

Idk, too many bad landings... ?

Or the GINORMOUS castle motor ?

Is there enough bolt left to grab with vice grips and pull them out after you remove it from the chassis?

I hope so, haven’t taken it apart to inspect yet.

 

[Primarrma]

That's impressive indeed, I have noticed the grade of the screws on this new K8s to be less than ideal, but that is insane!!!

 

[gotnitro]

I might have video footage haven’t looked yet. ?

Still waiting on those cereal vids... ?

How they are still lined up perfectly without the heads is the crazy part. Was there still some screw shaft sticking through the chassis holding the mount straight? I hope there is enough material to use a vice grip to twist out the rest of those screws if you plan in using the same mount.

 

[Jimbobjr]

Pretty crazy. Since you already had those bolts in and out from the chassis swap they should be too bad to remove. Rock on!

 

[jondilly1974]

Woah ?

 

[Hammer Down]

Well, the bolts were too short to get a vice grip on, except the middle one.

Had to resort to more drastic measures...
First I tried some cheap speed out bits. Those were garbage! The bits would hardly even cut into the studs, gave up on that. ?

At this point I’m ready to just order a new motor mount from JRC. I took a min and mulled over my options. Then I remembered I have an extractor set. ?

Next up, my snap-on/blue-point extractor set.

With some patience and precise drill work

Success!!! ? ?

Just need some new hardware now, off to Home Depot I go.
The only M5x16mm they had were stainless Phillips head... ??‍

Oh well... I put them in the center tower for now, and used the tower bolts in the motor mount until my new O.E. hardware comes.

All ready for more smashing now!! ?

 

[KevinC]

Awesome bro, glad it worked out for you. I think I’ll buy one of those kits. I have a spare Center diff case here I may be able to repair.
ps.
i really don’t know how these extractors work........ it requires drilling a hole in the broken bolt I reckon? What tiny bit did you have to use to get into the bolt?

 

[Hammer Down]

I think I’ll buy one of those kits. I have a spare Center diff case here I may be able to repair.

I used the smallest one in the kit and it was just the right size for the M5’s
Probably too big for the M2.5’s in the diff case. You might be able to find a kit that has smaller bits. ?‍

I too have a spare center diff with broken screws. ?

 

[Jimbobjr]

Nice skills getting those bolts out!

I have a spare Center diff case here I may be able to repair.

I while back I put up this thread on how to repair a k8s center diff. I would not call it easy but if you succeed you have an extra 100$ diff you can use.
https://www.arrmaforum.com/threads/broken-center-diff-repair.19010/

 

[Hammer Down]

Nice skills getting those bolts out!

Thanks Jim, that means a lot coming from someone with your skill set! ?

 

[KevinC]

Nice skills getting those bolts out!


I while back I put up this thread on how to repair a k8s center diff. I would not call it easy but if you succeed you have an extra 100$ diff you can use.
https://www.arrmaforum.com/threads/broken-center-diff-repair.19010/

I was following that thread Jimbob. I’m lazy and just decided to order the diff case set. Speaking of diffs....had shyte luck with this screw extractor today....most likely operator error..?

 

[Hammer Down]

I was following that thread Jimbob. I’m lazy and just decided to order the diff case set. Speaking of diffs....had shyte luck with this screw extractor today....most likely operator error..?
View attachment 92623

I tried something real similar to those first.
Complete garbage!!

 

[KevinC]

Most likely a combo of garbage and my skill level....?

 

[Jimbobjr]

With the diff bolts there are two issues. The first is locktite that is pretty common. The second is that the tapped holes are blind so the metal chips get packed down inside. It’s very hard to get those chips out of that tiny hole during manufacturing. Also if you measure the silver diff bolts compared to the hole they re nearly bottoming out. So they get tightened down in all those chips plus the locktite. Some will come out with heat and the ones bound in those chips will break for sure.