Posted by JerryCPP(WA) on December 15, 2007 at 06:17:25 from (71.252.64.50):
In Reply to: welch plug posted by larryinwa on December 15, 2007 at 05:59:35:
Welch plug is another name for expansion plug. There are three types: shallow cup, deep cup, and disc. The cup types look like a cup, and are driven into the hole in the side of the block using a socket and hammer, and held there by friction. The disc type is a concave/convex disc - the hole in the block has a ledge the disc sits on, convex side out. Then you take a ball pein hammer and smack it once in the center. That causes the disc to expand against the side of the hole. Both types are prone to rusting from the inside as they contact the coolant. You cannot re-use them, and it's always a good idea to remove them during overhaul. That way you can dig out the crud in the block, and put new plugs in.
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