Alright, so my project has been going slowly for a while since I have been busy with school. But right before the semester started, as I was installing my turbo manifold the threads for the exhaust manifold bolt that is furthest back (cyl 6, top side if I recall) came off in the bolt, and it just spun 'round and 'round . Needless to say that the threads are completely striped, and the bolt won't hold to save my life .

Which brings me to my question: Would it be alright if I just left if be for the time being? I don't plan on boosting more than ~9 pis ATM, but would the missing bolt be a huge deal? If so, what recomendations can you guys give as to how to fix this, short of taking the head to be professionally redone. I recently came across the heli-coiling process,but this seems a tad sketchy for the intended application. Are there any alternatives to this process? Any and all input is appreciated, I know that this site has some high quality input (at times ).

 

If there is enough room, you could always retap it with a slightly larger bolt/thread.

 

The threads are stripped inside the head assuming. Is that correct?

 

Yea, they its way in the back past cyl No. 6. I was looking online for a heli coil set, and holy crap they're expensive. Like $120 for a full set. I guess if I can find the specific one that I need I should be able to do it for cheaper, but then I was searching the Grainger online catalog and the inserts are like ~$20.00!! What the hell?!

emoFTW, you may be right, maybe I should just get a larger bolt and tap it... since the head is aluminum it should be tons easier than the union bolt was lol

 

Yep, it will be a lot easier, and cheaper too. It won't really matter unless you're just picky about it.

 

That much for Helicoil???? Holy cow.. try Oreilys...

 

Yea, I was also looking at Amazon and I think Sears, but they were expensive also lol. I think I'll just try to tap it a size larger, unless I can find a decently priced Helicoil set...

 

So I guess the next question is... does anyone know the stud threading size (you know, like M8 or whatever)?

 

10mmx1.25

http://store.driftmotion.com/static/...ud10mmx125.php

 

http://www.oreillyauto.com/site/c/de...yword=helicoil

will this work for him?? because i have the same problem

 

You can get the single size helicoil set at autozone or advanced etc for around $20. Comes with tap and like five coils. Your just need the drill and bit.

 

Club Lexus does it again! Thanks ScWift92, now to find the appropriate Helicoil set! Although I feel a bit dumb for not checking DM in the first place lol

 

Also, I assume that the 10mm <=> M10 right?

 

helicoils suck and they arent that strong.

ive had a stripped valve cover bolt hole on my head from the previous
owner installing an incorrect bolt and i went with a time sert

example:


you have to drill out a large hole (to match OD of time sert) and then tap the hole,
install the time sert (mine had a notch for a screw driver,) and then youre good.

i just borrowed oreillys tap/die thread repair kit (free.)


whichever way you go, make sure you use red thread locker. on the helicoil/time sert

yes m10 means 10mm.