Intake to Exhaust manifold bolts

[asdasc]

I need to pull apart my manifolds to do the porting and want to know what the bolts are called and where I can buy the tool for them.
They are a wierd 12 pt, maybe 6mm? It doesn't look like a standard Torx drive, is it?

[markandson]

No, they are metric 12 point, just go to a good parts store, you can buy a whole set.

[asdasc]

Excellent, thanks!
Notice the new Avatar! I just learned how to do that....

The GT is 'technically' my sons, and for some reason he really likes penguins, so it is in respect for my son!

[GTJIM]

The same 8mm 12-point or "Tri-square" bit as it is often called is the same size as used for the cam retaining cap screws - so you need one!
The sets come with 6mm; 8mm; 10mm and 12mm bits in then usually and you need all except the 6mm one for work on Opels - unless someone can tell us where on a Opel there are 6mm Tri-square cap screws ... ??

[Wolf Spyder]

Originally Posted by markandson No, they are metric 12 point, just go to a good parts store, you can buy a whole set.

Not as easy as you think! I ended up trying to get a set from the MAC tool rep to no avail. Please post whwe you got yours from.

[hrcollinsjr]

I would think MAC would have them. Snap On does as well as KD tools that are available at some auto parts houses. These 12 pt./triple square bits are used on other German cars I believe.

Harold

[hrcollinsjr]

Originally Posted by GTJIM unless someone can tell us where on a Opel there are 6mm Tri-square cap screws ... ??

I believe I pulled a fuel pump ONCE that had that type of bolt holding it on. I've never seen another one.

Harold

[GTJIM]

Originally Posted by Wolf Spyder Not as easy as you think! I ended up trying to get a set from the MAC tool rep to no avail. Please post whwe you got yours from.

The first KD Tools 12mm & 8mm ones I got from EBay - at huge expense! Then a "freind" at work gave me another as soon as he saw what it was.
Finally bought a complete set from a "Power Built" tool display at the local Home Handyman store - Smith's City Market, Christchurch - New Zealand.
They are also used to undo Ford 4-cylinder head bolts.
Any good Automotive tool store should have them. There are pictures on this site plus more discussion in other threads too.
See: http://www.opelgt.com/forums/showthr...ght=tri-square
Picture in post #12 Here: http://www.opelgt.com/forums/showthr...bolts+12-point

[asdasc]

I will look around and let you know what I find. I have rebuilt a 1.9L twice before but it has been 20 years. I still have the 12mm one I bought from Snap-On that is for the head bolts. It was pretty expensive at the time, I want to say about $25 for the one. In the previous rebuilds I just removed the head and put the same on back on, same with the manifolds, I just yanked them as a set and replaced them when the engine was done. I didn't know back then about the mismatch in the carb outlet and the Intake, so I had never done anything to it. This forum is great in that I now know more about what can be done for free to increase power! Like porting the intake manifold. Thanks.

[kwilford]

Search for "Lisle" which make speciality tools available at virtually EVERY decent automotive store. And read
http://www.opelgt.com/forums/showthr...7551#post67551
HTH

[krewzer]

Thanks Keith, for props on one of my few posts. Most of the time, I'm just fishin' for answers.

Wes

[asdasc]

Just to follow up on this thread, after searching 3 different local autoparts stores and one dedicated tool store with no luch, I finaly found one in my brothers tool box. He said he bought it locally from another autoparts store, so they are around, but you really have to look a little for them.
Thanks all!

[jakob]

The 12 point is fairly common in Europe. I bought mine at a local store for approx $11, and it contains M5,M6,M8,M10, and M12 and bit holders for 3/8" and 1/2" ratchet. It's 10 year warranty tools, so they should be fairly high quality. Maybe if there is any interest for it we could arrange something(unless the shipping is terrible!!)
Here's a picture

[David McCollam]

Originally Posted by jakob The 12 point is fairly common in Europe. I bought mine at a local store for approx $11, and it contains M5,M6,M8,M10, and M12 and bit holders for 3/8" and 1/2" ratchet. It's 10 year warranty tools, so they should be fairly high quality. Maybe if there is any interest for it we could arrange something(unless the shipping is terrible!!) Here's a picture

Hey Jake,

Nice set of bits. How much would it cost to send a set like that to Texas?

Thanks,

Dave

[asdasc]

OK, I got the tool and found out that you CAN strip the head of a triple square bolt. I don't know how I did it, but I did. I am going to try the impact driver idea.

I thought these bolts were chosen due to their reluctance to being stripped!

[greensmurf20]

i've never usually had much luck with those paticular 4 bolts. usually just drill the heads off so i can pick the intake up off from the exhaust manifold. then use some heat and a stud extractor on them if i manage to strip them, as i usually do.

asdasc: what part of michigan are you from?

[asdasc]

Clinton Township - between Sterling Hts and Mt Clemens.
If you have been in it for a while, you may have known my brother - Rick Anderson. He has given the GT to my son Kyle, his God son. It is turning into a bit of a father/son project.