engine stud

[MikeM]

has gone pop

clean break and no way of gripping with anything, must be  2mm recess

So speaking to bryan a drill job again.... what size helicoil for this one 

[matthewmosse]

Whereabouts has this one gone? exhaust? m6 again. I feel your pain, had a few go, expect I'll see a few more soon and I know I have 1 engine where a previous owner has drilled out to m8 and made a mess of it - not looking foreward to fixing 3 of them.

[MikeM]

exhaust stud , where you bolt the exhaut collar on, no 1 cylinder

last bolt i was tightning and it gave up

[matthewmosse]

Typical

[Bryanj]

M6 helicoil standard depth mate

[MikeM]

least I have all the correct stuff to fix........

what about swarf going into engine is that going to be likely outcome ? ..... any tips to avoid that.... just done a top end rebuild and don't really want to start pulling the head

[Bitsa (Ralph Wright - RIP)]

Thats as bad as the last cam tower bolt.Do it up and it strips right pain in the butt
Good luck
Bitsa

[Bitsa (Ralph Wright - RIP)]

Make sure the exhaust valve is shut on that cylinder then when repaired air it out
Cheers
Bitsa

[Trigger]

I use milk carton/ container tops. The round ones fit nicely in the port holes. 

[Trigger]

Just emailed you a picture on how to use the tops Mike.

[matthewmosse]

and put a bit of tape around the drillbit at the right depth as drilling right through to the inside is really not reccomended unless you like the engine to get coated in oil.

[MikeM]

well I drilled in with m6 drill, tapped and heli coiled and sure I have done something wrong

drilled in length of bolt that snapped, not gone all the way through ( should I )

tapped it m6 by 1mm tap and then put in helicoil, stud replacement set( bought of ebay ) when you put in stud it pulls out helicoil

any recommendations... this is last part of bike and this is not right I can nearly pull out helicoil with my fingers


just noticed m6 tap just slides into hole

getting close to  splitting this bike 

[ka-ja]

Hi,
    Is the tap a 6mm tap or a 6mm helicoil tap?

[Bryanj]

If the helicoil pulls out you can search keensert or timesert which have a bigger outside diameter

[Trigger]

O dear Mike, there is only 2 ways now. Go with a insert as Bryan has mentioned or if you know a good aluminum wielder that can do the job.