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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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<blockquote data-quote="greg brillus" data-source="post: 176995" data-attributes="member: 597"><p>That's probably why you can have issues with new studs if the thread pitch is 60 deg and not the correct 55 deg........many damaged threads, and many times it can happen if the original studs are not used......On early engines that originally used the 2 piece stud/tube arrangement, it is common for the upper section of thread in the cases to feel a bit "Sloppy" this is because the upper section of thread has been over tightened at some point and damaged the upper thread section.......with the lower part having the small brass insert, once removed this section of thread seems fine........It is a double edged sward to leave this and rely on the existing thread to handle the load.......The repair is not easy, unless you are clever enough to custom make new studs........time consuming and expensive......i feel the 5/8" UNF studs that Maughan's make is the best and quickest method.......I resist welding these cases unless absolutely necessary........distortion and annealing the surrounding alloy is not good.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 176995, member: 597"] That's probably why you can have issues with new studs if the thread pitch is 60 deg and not the correct 55 deg........many damaged threads, and many times it can happen if the original studs are not used......On early engines that originally used the 2 piece stud/tube arrangement, it is common for the upper section of thread in the cases to feel a bit "Sloppy" this is because the upper section of thread has been over tightened at some point and damaged the upper thread section.......with the lower part having the small brass insert, once removed this section of thread seems fine........It is a double edged sward to leave this and rely on the existing thread to handle the load.......The repair is not easy, unless you are clever enough to custom make new studs........time consuming and expensive......i feel the 5/8" UNF studs that Maughan's make is the best and quickest method.......I resist welding these cases unless absolutely necessary........distortion and annealing the surrounding alloy is not good. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Black Shadow Crankcase Threads
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