Baller Hugh Nichols Posted November 17, 2011 Baller Share Posted November 17, 2011 The threads on my engine block drain plugs have karoaded till i can't replace the anti knock sensor on the right side. I tried a tap but the crap is hard as a rock. Any suggestions? Link to comment Share on other sites More sharing options...
Baller thompjs Posted November 17, 2011 Baller Share Posted November 17, 2011 Dude, call Super Dave -- he fixed his. You probably are using the wrong tap. Use anti-seize on them when fixed Link to comment Share on other sites More sharing options...
Baller thompjs Posted November 17, 2011 Baller Share Posted November 17, 2011 Dave thinks it was 1/8th pipe thread Link to comment Share on other sites More sharing options...
clemsondave Posted November 17, 2011 Share Posted November 17, 2011 If its just corrosion, try something like Lime-Away. But yes it is pipe thread. Link to comment Share on other sites More sharing options...
Baller_ RichardDoane Posted November 17, 2011 Baller_ Share Posted November 17, 2011 it should be 1/4 pipe thread, use a sharp tap (not an old worn out one) and a little thread cutting oil Link to comment Share on other sites More sharing options...
Baller rawly Posted November 17, 2011 Baller Share Posted November 17, 2011 1/4-18 pipe tap,try to clean up the first few threads with a dental pick or similar tool so you don't cross the threads.good luck Link to comment Share on other sites More sharing options...
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