Jump to content
Jim Bowen

Thread repair, Exhaust stud holes.

Recommended Posts

Just fitting a couple of studs the engine and one of them wouldn't torque up, just spinning in the hole in the head :(

 

Is it possible to fix this with a helicoil? Hopefully i can source one tomorrow or thats me buggered :lol:

Share this post


Link to post
Share on other sites

I've ended up ordering a thing called a Wurth Timesert, meant to be a lot better than helicoils, just expensive. Hopefully i'll only need it once then i can sell it.

Share this post


Link to post
Share on other sites

Was one of the exhaust stud holes in the head, if you are looking at the engine from exhaust side its the bottomest rightest hole.

 

The stud seemed to fit in ok, but took some force to get it in far enough and once i put the manifold on it just kept spinning round. I might of got something stuck in the hole while cleaning that stopped the stud going in, not really sure. I'll fix it though. Didn't fancy a helicoil in the end as this option seemed the best.

Share this post


Link to post
Share on other sites

I've used timeserts before to fix a bike frame. They're way better than helicoils.

Share this post


Link to post
Share on other sites

I'm a little concerned about my drilling and tapping capabilities, Drilling is one of them things i never seem to be able to get right, usually go all over the place and staying straight is hard :lol: Went through my finger last time i used a drill :(

Share this post


Link to post
Share on other sites

Either type would work fine for an exhaust stud - they're only inserted relatively loosely, not under mega-tension like head bolts are. If you're not 100% happy doing it then you'd be much better off asking a local machine shop nicely and offering them a tin of biscuits to do it over the lunch break. Not worth (further) damaging a head in the learning process...

 

Stone

Share this post


Link to post
Share on other sites

Did it myself, wasn't as bad as i feared.

 

Bad Hole

20130529_174353.jpg

 

Make hole bigger with drill

20130529_174904.jpg

 

Hole is bigger

20130529_175009.jpg

 

Counterbore the hole

20130529_175201.jpg

 

The hole ist counterbored

20130529_180855.jpg

 

Make new thread in the hole

20130529_181226.jpg

 

New thread ist in de hole

20130529_181617.jpg

 

Screw in ze insert

20130529_181825.jpg

 

Use special tool to wind insert in and lock in place, ja!

20130529_181955.jpg

 

Insert is inserted

20130529_182423.jpg

 

Worked really well and i managed to do it all myself without cocking it up any further. The insert stuck out about 1mm and didn't sit flush, this was because the insert tool hit the back of the hole. I sorted it out though and manifold is on.

Share this post


Link to post
Share on other sites

Good stuff! I used normal helicoils on a couple of my exhaust studs and they were fine for 60K miles. Those time serts do look the business though.

Share this post


Link to post
Share on other sites

Good work! I've had very mixed results tapping things so I'm glad it worked out ok :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...