Does anyone know where you can find repair parts for the old "take apart" plugs? More specifically, the screw on electrode cap and the crushable copper rings used between the two parts of the spark plug.
There is no cap that screws on. On the later X plugs the brass cap is crimped onto the insulator. The 8-32 electrode post is embedded in it. They don't separate. The earlier X plugs have a small washer and nut on top to fit the removable 5-40 electrode.
You won't find an exact reproduction of the washers. I tried to get some of the current ones from the manufacturer with no success. That's just as well, because I'm not impressed with them. What I have found, I think, is better – copper crush gaskets I bought from an aircraft supply.
All the information is here: http://www.mtfca.com/discus/messages/506218/513718.html?1422570598
Like Steve, I have looked for replacement washers for the Champion X and A 25 take apart plugs. Googled and looked at every combination of words that might apply to the little, very thin copper gaskets used on same.I have looked up "conical crush washers", "cupped copper washers", etc, etc. I know there has to be a conical washer to take up irregularities on couplings where they might leak, but I cannot find anything anywhere.I do know the newer X use a much thicker copper sealing gasket than the older ones, so Steve's idea of crush gaskets may be the only way to go. These are the same type as are used in exhaust and intake make-up, only larger. Maybe a member could stamp out thin copper washers that would conform to the electrode when tightened, thereby sealing the plug. Any takers?
I seem to me that the main sealing washer on some plugs I have seen were more then just cupped washers and some have asbestos packing built into them. What are the modern take a part Champion's using to seal with?
I haven't driven a lot of miles on these, but they seem to be OK so far.
Mark, the new ones have just a narrow copper ring. As I mentioned above, I wasn't impressed.
Thanks Steve, they cost to much to just take apart.
Steve, I wonder what is the composition of the white filler inside the copper? Is it heat sensitive? If so, can it be picked out?
I assume the stuff inside the gaskets is an asbestos substitute. It must take the heat OK. I haven't seen any fire coming out the tops of my plugs when car is running. I suppose after they've run awhile I should open up a plug and take a look.
It's more then likely the same stuff as used in the manifold gaskets.