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Tech. Advice: Series 'A' 500cc/1000cc Bikes
BA Gearbox Bearings
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<blockquote data-quote="A_HRD" data-source="post: 175866" data-attributes="member: 49"><p>I can confirm that the BAP gearbox output bearing is 1.500" x 72mm x 17mm. It's 1.500" bore because that is the OD of the Driving Gear Sleeve. Consequently, the two should slip together as a nice smooth sliding fit. Why anyone would want to seek any other size I know not. </p><p></p><p>Decades ago, SKF sold this size to Burman (unsealed); they called it a W3500A. Naturally, as the use of Burman BAP gearboxes declined in the mid-1950s, SKF stopped producing that bearing. Subsequently, as the supply began to dry-up and bike restoration took-off as a hobby, people needed that very bearing. The requirement was fulfilled by a few enterprising bearing companies taking a stock metric bearing of the same OD and width, then boring them out to 1.500". And that's still where we are today, and that's why its so expensive to buy. Be sure to buy reputable donor bearings. (Don't even think about buying Chinese ones!). The VOCSC one is £135+VAT; but it has steel shields which pass oil. </p><p></p><p> I have one left of SKF manufacture 1.500" x 72mm x 17mm with seals in both sides; but it's destined for one of my projects. I recommend leaving both seals in place to keep contaminants out. The correct amount of factory grease is trapped inside and will outlast most of us! </p><p></p><p>Peter B</p></blockquote><p></p>
[QUOTE="A_HRD, post: 175866, member: 49"] I can confirm that the BAP gearbox output bearing is 1.500" x 72mm x 17mm. It's 1.500" bore because that is the OD of the Driving Gear Sleeve. Consequently, the two should slip together as a nice smooth sliding fit. Why anyone would want to seek any other size I know not. Decades ago, SKF sold this size to Burman (unsealed); they called it a W3500A. Naturally, as the use of Burman BAP gearboxes declined in the mid-1950s, SKF stopped producing that bearing. Subsequently, as the supply began to dry-up and bike restoration took-off as a hobby, people needed that very bearing. The requirement was fulfilled by a few enterprising bearing companies taking a stock metric bearing of the same OD and width, then boring them out to 1.500". And that's still where we are today, and that's why its so expensive to buy. Be sure to buy reputable donor bearings. (Don't even think about buying Chinese ones!). The VOCSC one is £135+VAT; but it has steel shields which pass oil. I have one left of SKF manufacture 1.500" x 72mm x 17mm with seals in both sides; but it's destined for one of my projects. I recommend leaving both seals in place to keep contaminants out. The correct amount of factory grease is trapped inside and will outlast most of us! Peter B [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
BA Gearbox Bearings
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