I got a new cylinder base nut set from RGM and found that two of the nuts are 5/16, all my studs and holes in cylinder flange are 3/8, was this changed at some point?
Thanks
7x 3/8"; 2 x 5/16" Have a…
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case studs VS barrels
1949 thru 1975 front 2 barrel holes are 3/8...., front 2 case studs are 3/8... necked down to 5/16
however during that period the nut thread pitches did change
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It's possibley...
... to allow clearance for the spanner although a reduced hexagon might be a better solution for that.
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Engineering?
Barrels are iron, cases are aluminum. putting smaller shorter diameter studs in aluminum is not smart, they can pull out easier. Putting 5/16 holes in the iron barrels is not smart, makes barrel manufacturer change drill setup.
Only one iitem is now special, the stepped studs, they were not stupid !
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Ok makes sense
Hello David have ordered the stepped studs, curiously the front centre stud is short too but specified at all 3/8”!!
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Which stepped studs?
Peter
Hope you ordered the early type 26 tpi through 71? VS later UNF 24 tpi 72-75 ? IIRC
of course a 99 part should be early
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7x 3/8"; 2 x 5/16"
Have a look at the illustration:
https://andover-norton.co.uk/en/shop-drawing/891/dommi-engine-500-600cc#