Spark plug ceramic: How to remove?

[69427]

I'm working on making a fitting to put compressed air into the cylinder(s) while I'm in the process of removing and installing valve springs to check my piston to valve clearance, and also the piston valve pocket clearance. I'm using an AC sparkplug for the correct thread size, and will weld/braze an airhose fitting to that. The hold up is, HTH do you get all the ceramic chipped out of the plug? That stuff is damn tough. Anyone done this with any success?

 

[DWncchs]

I put mine in the vice on the flats and tightened enough to crack the ceramic,then rotated and tightened and cracked some more. Once I went around once it fell out.

 

[010752]

Here is a pic for making a TDC tool frpm a plug.

 

[mrvette]

I'm working on making a fitting to put compressed air into the cylinder(s) while I'm in the process of removing and installing valve springs to check my piston to valve clearance, and also the piston valve pocket clearance. I'm using an AC sparkplug for the correct thread size, and will weld/braze an airhose fitting to that. The hold up is, HTH do you get all the ceramic chipped out of the plug? That stuff is damn tough. Anyone done this with any success?

Why not buy a cheep hose setup to do the same thing?? I have had one for years now...sorta the same as a compression checker...just inject air into the cyl, piston flips to BDC and holds valves in position...

ME, I prefer the rope trick...clothesline down the spark plug hole, slowly bring piston up to jamb the valves closed, ...obviously the rockers are free on that cyl anyway....

or am I missing something??

:clobbered: