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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank Case Inspection
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<blockquote data-quote="Pushrod Twin" data-source="post: 57551" data-attributes="member: 340"><p>Thank you gentlemen. Peter, Greg, yes, all of these things must be checked & inspected for serviceability. Having been an aircraft technician early in my career, then an aeronautical machinist for the next 30 odd years, I am vaguely familiar with inspection techniques, which is why I ask for dimensions & tolerances. We all know the case mating surfaces need to be flat, how flat? If I place them on a surface plate, is a .005" feeler gauge blade acceptable? When I measure the mains bearing bores, what should the diameter be, how much out of round, if any, is acceptable? When I torque the case halves together, what is the dimension of the cylinder throats, variation in flatness of the decks etc? Timing case spindles, we know they are an interference fit, I dont expect to pull them out for a measure, has anybody calculated a torque test with a nut pulling over a sleeve to determine how much torque indicates acceptable "tightness"?</p><p>I guess as a long time Moto Guzzi owner I have been spoilt, while not quite up to aircraft standards, they do at least have understandable tables of dimensions & tolerances.</p><p></p><p>David, my MPH's start at 533, June 93. I am only a pup in this organisation! But thanks for the steer, I do have 40 Years on & will clearly need to spend the time looking there & the 10 year sequel. I will also need to laboriously look back through what I do have to find Neville's later articles.</p><p></p><p>So, conclusion; it appears that I will need to write an inspection list, fill in the dimensions & tolerances, then publish it. </p><p>I will be asking for help where I cant find answers elsewhere.</p><p>It wont start this week, I still have a shaft to finish machining which will drive the alternator. That is the last job to complete for the Norton gearbox hook up to my die cast Series C cases, would you like to see what I have done?[ATTACH=full]3297[/ATTACH] [ATTACH=full]3298[/ATTACH]</p></blockquote><p></p>
[QUOTE="Pushrod Twin, post: 57551, member: 340"] Thank you gentlemen. Peter, Greg, yes, all of these things must be checked & inspected for serviceability. Having been an aircraft technician early in my career, then an aeronautical machinist for the next 30 odd years, I am vaguely familiar with inspection techniques, which is why I ask for dimensions & tolerances. We all know the case mating surfaces need to be flat, how flat? If I place them on a surface plate, is a .005" feeler gauge blade acceptable? When I measure the mains bearing bores, what should the diameter be, how much out of round, if any, is acceptable? When I torque the case halves together, what is the dimension of the cylinder throats, variation in flatness of the decks etc? Timing case spindles, we know they are an interference fit, I dont expect to pull them out for a measure, has anybody calculated a torque test with a nut pulling over a sleeve to determine how much torque indicates acceptable "tightness"? I guess as a long time Moto Guzzi owner I have been spoilt, while not quite up to aircraft standards, they do at least have understandable tables of dimensions & tolerances. David, my MPH's start at 533, June 93. I am only a pup in this organisation! But thanks for the steer, I do have 40 Years on & will clearly need to spend the time looking there & the 10 year sequel. I will also need to laboriously look back through what I do have to find Neville's later articles. So, conclusion; it appears that I will need to write an inspection list, fill in the dimensions & tolerances, then publish it. I will be asking for help where I cant find answers elsewhere. It wont start this week, I still have a shaft to finish machining which will drive the alternator. That is the last job to complete for the Norton gearbox hook up to my die cast Series C cases, would you like to see what I have done?[ATTACH=full]3297[/ATTACH] [ATTACH=full]3298[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank Case Inspection
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