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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
stripped crankcase threads
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<blockquote data-quote="Marcus Bowden" data-source="post: 117095" data-attributes="member: 3287"><p>Gary my handsome,</p><p> The thread in the c/case is 5/16" Whitworth. UNC will also do it, tapping size drill is 1/4" for BSW. You will be safe drilling another half-inch, then either get a second stage tap (suitable for tapping aluminium) and grind the shank to 1/4" dia then some 5/16" steel rod and drill 1/4". Grind a flat on the tap, hold the steel rod in a vice cut a short length of silver solder and drop it into the rod hole with some easy-flow flux and tap on top use a propane torch to heat on the area at the base of the hole keeping pressure on tap till it sinks into rod and you see silver come up. Squirt kerosene/paraffin into the hole and gently tap the hole further in, make up a longer stud with Whit one end and BSF the other or a length of 5/16" Whitworth stud bare if no threading facilities. Job done, bar the shouting which it essential.</p></blockquote><p></p>
[QUOTE="Marcus Bowden, post: 117095, member: 3287"] Gary my handsome, The thread in the c/case is 5/16" Whitworth. UNC will also do it, tapping size drill is 1/4" for BSW. You will be safe drilling another half-inch, then either get a second stage tap (suitable for tapping aluminium) and grind the shank to 1/4" dia then some 5/16" steel rod and drill 1/4". Grind a flat on the tap, hold the steel rod in a vice cut a short length of silver solder and drop it into the rod hole with some easy-flow flux and tap on top use a propane torch to heat on the area at the base of the hole keeping pressure on tap till it sinks into rod and you see silver come up. Squirt kerosene/paraffin into the hole and gently tap the hole further in, make up a longer stud with Whit one end and BSF the other or a length of 5/16" Whitworth stud bare if no threading facilities. Job done, bar the shouting which it essential. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
stripped crankcase threads
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