Stripped Thread

[carpy]

Well it had to happen didn't it, even though I used new bolts, even though I was super careful, even though I used the correct torque the very last bolt that holds the cam caps on stripped the thread in the head and spun like a wheel. What to do? I know it will be an insert of some sort, can I do it myself, what's the best, do I have to take the head off, so many questions and so little ability and so fed up

[tricky]

hi mate, what you need fitting is a wurth, m6 timesert, any reputable bike shop should have these, or you can buy a kit from wurth, and do it yourself, hope this helps, tricky.

[steve.w]

try a slightly longer bolt

[z1bman]

i would advise not to use a longer bolt as sometimes they can damage the inner wall of the shim bucket if overtightened i have used these kits for many years

http://www.ebay.co.uk/itm/RECOIL-THREAD ... 572wt_1037

[carpy]

How long should the insert be?

[z1bman]

a 6mm insert is about 8mm long

demonstration on how to heli coil

http://www.youtube.com/watch?v=sQHRB2El ... ure=fvwrel

[carpy]

Thanks for the info, looks like it's time to learn a new skill and hope I don't balls it up

[Garn 1]

Carpy, you haven't lived with Z's, until you have stripped at least two or three of these 6 mm bolt holes, that hold the cap of the cam-shaft bearings.

There have been a plethora of reasons....

The new bolts had a bad burr on the end of the thread.
The flange on one end of the cam-shaft was not lined up and jammed..
The tacho drive wasn't seated and jammed.
the torque setting was in Ft-lbs instead of in-lbs (manual was wrong!).. Personally, I don't use a torque wrench on 6mm
They were not tightened evenly....
and so on!

We all have done it, the more serious is usually with the ones with the dowel, as we have to go deeper with the helicoil, or timesert. Nevertheless, they all can be fixed.
Pertonic has an unique way of dealing with them that works, using studs and not bolts, however, just for one or two the usual fixes suffice.
In some cases we can go a lttle deeper with the drill, however standard practice with an insert usually fixes them... Good luck.
RegardZ.

[Rich]

How long should the insert be?

look at one of the old bolts, you will be able to see how much thread was used. Insert length is usually a multiple of the diameter ie 1x 1.5x 2x etc

[kev edwards]

[quote="Garn
Pertonic has an unique way of dealing with them that works, using studs and not bolts, [/quote]

Thats not pertonic that uses studs it's me i do have a set i said i would send to someone i have just got to dig them out.

[Garn 1]

Sorry KevE, great job... you are on my list as one of the many experts over on this GB site.
RegardZ.