Shearing a coupler.

[Crab]

Anyone ever strip out a coupler? We (not mine) had that happen over the weekend on a square, sucked a rock and there was a loud pop, the couplers turn, but not the midshaft.

 

[Matt_E]

Yes, that happens. I did it on Phill's square.

 

[hooka-2]

I did it on my 750 X2. Stripped the threads right out of the drive shaft coupler

 

[Crab]

Yes, that happens. I did it on Phill's square.

Was it easy to repair, what thread pitch.

 

[Phill]

he got you wrong......it was the coupler that broke....not the threads

 

[Matt_E]

Yeah, that's it.

 

[willycrumb]

seems like its designed that way....better than the shaft right?

 

[DBLOCK]

Crab,
I don't see how we could fix JeffP's stripped coupler - we'd have to fab something to thread over the shaft, then run oversized threads into the coupler... More work than it's worth in my opinion. Easier all around to buy another coupler.

 

[Crab]

Agreed, just thinking it may have aluminum welded to the stainless.

 

[DBLOCK]

So, just to post an update...

It wasn't the coupler that sheared, but the shaft. I saw it for myself today.

The shaft sheared right behind the threads.

JeffP has a toploader intake grate. He must have sucked in a big rock as he beached in Mukilteo. The shock from that rock wedging the impeller must have been just right to break that shaft (maybe it was already cracked).

I was amazed that a machined shaft gave before a cast OEM coupler - but that's what I saw...

 

[Phill]

ehh....that sucks......

 

[Crab]

The best part, I took my big eze-out and the remaining threads came right out of the coupler by hand!