Cylinder studs

[JPark]

Any particular trick to removing the cylinder studs from the cases, which are apart? I'm hoping to true the spigot which is off enough to be of concern for sealing. I haven't tried anything very persuasive as yet; don't want to make it harder than need be.

[dirty_rat]

Take two nuts of the appropriate size (early 100's had a 7mm x 1.0 thread, most others had a 8mm x 1.25 thread). put them on the stud and lock them together (tighten them together using two wrenches) . Then, put a wrench on the lower one and unscrew the stud from the case. Remove the nuts and go on to the next stud.

[thrownchain]

I good set of vice grips.

[Bert44]

What dirty rat said, plus heat the cases until spit sizzles (or 100 c).

[JPark]

I'd already tried those methods but the nuts still slipped and so did the vicegrips. I didn't want the aluminum coming along with the stud so I backed off. But a better vicegrip finally worked and the other three were less cranky.

The spigot was way off which explains the ooze around the seam. The head was also warped pretty severely so it pays to check these things while you're there.

[MTrat]

Harbor Fr(e)ight has a wrench specifically for removing studs. Pretty cheap and useful for other things.

[Lugnut68F]

Turn the case half over and put the stud in a vise. Put it down close to the base where it goes into the case. Tighten the vise as tight as you can get it and work the case back and forth until it breaks loose. Once it breaks loose, you should be able to take it out with vise grips. I'm sure it's not a recommended method but it works for me just fine and don't get mess up the studs. This is assuming you have the cases split.

[rlkarren]

This tool is made specifically for removing cylinder studs. How to use it will reveal itself when you get it in your hands.
if this tool doesn't remove it... well, it WILL remove it or snap it off. At least then you can have it drilled out if it snaps off.
As MTRat says, I got mine at Harbor Freight.

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I've pulled numerous hodaka 90/100 engines apart that would otherwise be boat anchors. By removing the cylinder studs I am able to split the engine no matter how stuck the pistons are. The cylinder and crank assembly is removed as one and then I use a Hydraulic press to press out the piston. Saved many cylinders and complete engines, because this tool could remove those cylinder studs.

$0.02

Roger

[thrownchain]

Make sure the tool you buy is small enough to take out the size stud you have. I have one of those and it just rotates around the stud. Need to find a smaller size.

[viclioce]

Also consider applying some heat to the cases in the immediate area of the stud being removed. I have found that sometimes turning the stud or bolt clockwise as to tighten it, can break it free & make it turn much more easily coming out. Victor