3 wasted studs? or bolts? help!

[PtheDude]

I've got one of these going on my L20b the 3 studs around the mount for the down pipe are wasted.

 

 

 

Are they studs? can I heat them up, and get a grab on them and get them out? or should I just bring it somewhere to have them machined out? again, not at the block, at the bottom. I'm getting it powder coated for my hotrod, so your input is appreciated and time critical!

[yello620]

They will come out with the right amount of heat and a lot of luck.

[merlin]

odds are you.ll have to drill them out. use smaller size drill bit and they will likely twist out the top as you're drilling them out.

[DanielC]

They are studs, and they have rusted in place. You can drill them out, and then retap the holes.

 

If you have time, do this first. You can use electrolysis to get rid of the rust. This page for details.

http://community.rat...l__electrolysis

 

I have also been doing some rust removal, using molasses. Mix 1 part molasses with about 7 parts water, put the end of the manifold in the solution. Give it time to work, it works better when warm. I have actually had some good results using an old crock pot to keep the molasses warm.

 

If you do decide to drill them out, start with a center punch hole in exactly the center of the broken off stud. I actually gring the end of the stud off flat so I can see the center better. Then drill with an 1/8 drill bit, making sure you keep the hole centered.

The threads in the manifold are M 8x1.25. The largest drill you can use, assuming the hole is exactly centered is 17/64. I like to use several intermediate sizes between the 1/8 drill, and the 17/16 drill.

If you happen to get off center, do not use the 17/64 drill, stop at something smaller. Use a center punch to drive the remaining part of the stud toward the center of the hole, and see if you can loosen it that way.

[datzenmike]

If there is enough stud to get some vice grips on, heat the manifold around them orange/red hot, snap them on quickly and twist out.

[Laecaon]

Heat manifold, dry ice on stud, vice grip out.

 

There is a video off this with a VG30 manifold on youtube.

[datzenmike]

If you have some dry ice in your tool box. The stud will stay colder than the red hot manifold at least long enough for the manifold to swell from the heat and expand the hole.

[PtheDude]

I freakin cranked on this for 2 hours. wasted a good pliers, and broke another stud. The 40+ year old manifold is down the street in Ballard, at Seattle Muffler. 100 bucks to get new studs.

 

!@#$%!@#$!% I can do lots of things, this wasn't one of them.

[datsunaholic]

When I had that happen my grandfather drilled them out. We put bolts in their place. Not pretty, but it worked. Nowadays I'd do it myself, adding LOTS of heat. And use good vice grips. Not those Harbor Fright junk ones that slip.

[Dat510_Chris]

Broke off a stud recently while swapping heads, welded a nut onto the stud, which also heats the head around the stud.

[jesusno2]

the welded nut can break the tip off and screw ya ive had great success oxy fuel some silicone bronze rod onto the tip of the stud slowly buiilding it taller and taller then they come out pretty easy.