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BILL WILLIAMSON · 05-22-2012, 01:48 AM

A looong time ago, I saw an old time machinest "stitching" a crack in a head surface. He drilled & tapped a hole at the beginning of the crack he then used a 1 1/2" long cast iron plug that was threaded on the lower end & square on the upper end. He dipped the threaded end in sulphuric acid, screwed it into the hole, snapped it off, then filed it flat. Drilled & tapped another hole, slightly overlapping the first hole, then repeated the process over & over until the whole crack was filled! I don't remember if I saw him surface the head or what kind of surfacer he had. He said the sulphuric acid was to "lock" the threads securely. Bill W.

05-22-2012, 01:48 AM	#3
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: Head Crack Stitching the Old Way A looong time ago, I saw an old time machinest "stitching" a crack in a head surface. He drilled & tapped a hole at the beginning of the crack he then used a 1 1/2" long cast iron plug that was threaded on the lower end & square on the upper end. He dipped the threaded end in sulphuric acid, screwed it into the hole, snapped it off, then filed it flat. Drilled & tapped another hole, slightly overlapping the first hole, then repeated the process over & over until the whole crack was filled! I don't remember if I saw him surface the head or what kind of surfacer he had. He said the sulphuric acid was to "lock" the threads securely. Bill W. __________________ "THE ASSISTANT GURU OF STUFF"