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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Straight Torque
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<blockquote data-quote="greg brillus" data-source="post: 106809" data-attributes="member: 597"><p>2 points of interest........ The hollow studs only pick up on the upper half of the 9/16" thread in the crankcase, this explains why on some older engines you find that section of thread is quite sloppy whereas the lower half is still a good diameter where the brass inserts are seldom removed/disturbed. The second point is that the early heads that do not have the vertical rib up the center of each side, are quite weak in their alloy towers where the hold down studs pass through. Plenty of these early heads end up badly cracked from the nuts being over tightened in an effort to seal the head to barrel joint. Torque figures would never have been quoted on account of that owners would never have had a torque wrench in those days, just like they didn't own a lathe or mill.......We are lucky these days that we can own all these tools and carry out a good job. Volkswagen engines used the same head to barrel seal form, and they are only torqued to 19 Ft lb's, but they are very small diameter studs as well. I think one issue of over tightening the head nuts arises from the visual size of the hold down studs suggests that they can be pulled down to a much higher figure. The waisted studs are quite massive, but as we all know, this all adds to the massive strength of the engine to replace the conventional frame section.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 106809, member: 597"] 2 points of interest........ The hollow studs only pick up on the upper half of the 9/16" thread in the crankcase, this explains why on some older engines you find that section of thread is quite sloppy whereas the lower half is still a good diameter where the brass inserts are seldom removed/disturbed. The second point is that the early heads that do not have the vertical rib up the center of each side, are quite weak in their alloy towers where the hold down studs pass through. Plenty of these early heads end up badly cracked from the nuts being over tightened in an effort to seal the head to barrel joint. Torque figures would never have been quoted on account of that owners would never have had a torque wrench in those days, just like they didn't own a lathe or mill.......We are lucky these days that we can own all these tools and carry out a good job. Volkswagen engines used the same head to barrel seal form, and they are only torqued to 19 Ft lb's, but they are very small diameter studs as well. I think one issue of over tightening the head nuts arises from the visual size of the hold down studs suggests that they can be pulled down to a much higher figure. The waisted studs are quite massive, but as we all know, this all adds to the massive strength of the engine to replace the conventional frame section. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Straight Torque
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