rocker arm spring?

[30psi]

Originally Posted by JackieFan

this might help explain....

http://www.roadstarmagazine.com/modu...rticle&sid=233

30psi.... I take it that's what you meant?

Yeah, Pukka did it. I think you need an M8..

Yeah that engine is as clean as mine inside!

[JackieFan]

Do you think that dropping a longer threaded bolt in that hole would stop it from happening?

[30psi]

You'd need to see how deep the thread goes. Also it maybe be possible to go deeper after helicoiling them. The beauty will helicoiling is that its a stronger thread. The issue with the larger holes being drilled is that they get awfully close to the cam bearings.

The issue isn't how deep the thread go to be honest. The issue is that the aluminium weakens (becomes brittle effectively) and allows the threads to be broken away. Similar to the exhaust studs as well which are known for falling out.

[JackieFan]

I might whip the cover of mine at the weekend and see if I can't squeeze a bit more thread down there, even if it's only a couple more turns its got to re-enforce it a bit as you'd be spreading the load over almost twice the area.... i think

[30psi]

Originally Posted by JackieFan

I might whip the cover of mine at the weekend and see if I can't squeeze a bit more thread down there, even if it's only a couple more turns its got to re-enforce it a bit as you'd be spreading the load over almost twice the area.... i think

OK, well go careful as to not over tighten them

[northerner]

Helicoil size is M8x1.25 I had to do Four of my mates old car that snapped the Exhaust rocker shaft. I've still go the kit with Six left. You can have them for a tenner If you want

[turbomike]

i notice on mk1s its bolts holding down the shafts and on mk2s its studs and bolts,would it possibly be worthwhile using just studs maybe loctited in and doing away with the bolts as long as the threads are good,i know its the soft alloy thats the main cause of the problem

[30psi]

Well currently I've only got bolts, but once did notice studs on a bluebird. I suspect that its hard to tell what it has, but they look like bolts to me in the pic.