Threaded injector bolt hole !!!

[Deleted member 138290]

So I found yet another injector leaking so went stripped it out cleaned up and put back in but this time I’ve managed to shear the threads in the hole !! **** it !! So, what size rethreader and what size bolt now to get hold of ???? Thanks !

 

[mersum1es]

Use original (new!) bolt, and install timesert repair kit

 

[Deleted member 138290]

Yes I’ve just researched this, thanks

 

[Deleted member 138290]

Bit confused which size repair kit to get ?

 

[Deleted member 138290]

Bit confused which size to get ?

 

[Deleted member 138290]

M6 ?

 

[Deleted member 138290]

M6 ?

 

[bob6600]

No need to post everything twice

The bolt is M6 so yes you would need a M6 repair kit. When you took the original bolt out, you should have replaced it as they are stretch bolts and should always be replaced.

 

[Wolfie1]

Either that or just drill and tap the hole out to an m8, done that before

 

[amazighman]

Careful not to drill too deep , coolant galleries underneath

 

[Deleted member 138290]

Lol my 1st post didn’t appear so I resent it and then it kept coming up twice . Normally I put new bolts in but as it was ment to be a quick job I didn’t and faced the consequences ! Thanks

 

[Naturalwaster]

look on ebay ..£9 insert ..search Mercedes injector thread repair..

 

[Deleted member 138290]

Well the bolt I snapped isn’t even budging with extractor bits, it’s tight as ! Just have to kp at it slowly/ steadily until it starts to loosen up..... to rethread you drill 45mm don’t you ?

 

[Deleted member 138290]

Well drilled/ tapped most of today and ends up drilling most the inner of the bolt out yet it’s still stuck in there ! As for the threaded hole, got the m6 time insert but drill bit drops straight in the hole so I haven’t attempted to do anything. Going to be a mobile technician I think... an M8 bolt conversion would definitely be a good idea but I’ve spent enough atm already !

 

[Deleted member 138290]

So, got the holes sorted and put the car bk together and none of the injectors are leaking but, I’ve now got mega black smoke when I kickdown ?????

 

[Deleted member 138290]

Crumbs !! 1-4 are still bubbling but, I darnt try to tighten them anymore !!!!

 

[bob6600]

Did you use a torque wrench and new bolts? The torque is pretty low at 7nm + 90deg +90deg. I chickened out at the last 90deg but went about half way and there were no leaks

 

[mersum1es]

Did you cleaned and checked bottom of injector holes were super clean, straight/flat? Cleaned the thread hole 100%.

 

[Deleted member 138290]

Holes wherent 100% clean no as my cutting kit didn’t seem to clear ALL the crap out..... but yes I’ve used brand new bolts and I’ve a load of spare new ones now too..... and seals...... looks like I will have to strip and clean them all again, somehow.......

 

[mersum1es]

long time leak will damage the sealing surface and it needs to be refined carefully... copper seal won't tighten damaged surface.