Helicoil Kit

[Fiddlesticks]

Had a minor disaster yesterday torquing up the rear sprocket. 

 

"Oh", thinks I. "So that's what all the fuss was about on the forum..."

 

To add insult to injury, the bolt extractor didn't want to play and by the time I'd drilled out the stud the internal threads were well and truly ruined.

 

A new rear sprocket carrier was well over £200 (plus studs, bearings etc.) so got my lad to use his Prime account to get me a Helicoil kit on a 24hr delivery.

 

The kit included the correct size drill and tap to make new oversized threads for the coils, although not the tap handle which I already had.

 

 

With a bit of 3 in 1 oil and a lot of pushing, twisting, backing off, blowing away the swarf (repeat), finally had some internal threads cut.

 

Screwed two coils into the hole - second one was a bit tricky. Then the stud which was tight, but doable with two nuts turned against each other to create a bolt head.

 

Here's the finished product together with the kit. Will re-balance the wheel when it's all back together.

 

A first for me, last time I drilled out a bolt the threads were undamaged.

 

 

Edited January 25, 2023 by Fiddlesticks

[Stu]

Saved it without dramas well done

[Squidward]

I had a Honda CB250RS that some clown used 1/4 Whitworth set screws to bolt the cam cover down to the cylinder-head...5 of 'em, bought a 6mm helicoil kit of 'the net', was careful.....worked a treat.

[Turbodave]

Glad all went well for you mate! I think the last time I used a helicoil was on a Transit Engine, snapped Stud as well.

I usually leave a thin bit material in the thread after drilling and try an "easy out" to remove that or chap it away from the threads with a hammer and pick/small screwdriver. This leaves the threads intact. 

The last thing I had siezed was Caliper Pins, I just bought a new Caliper but I will remove those pins in my own sweet time.