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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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<blockquote data-quote="oexing" data-source="post: 112878" data-attributes="member: 1493"><p>While reconstructing my Argentina B-Raps I had to deal with same problem a few months ago and decided to get a real nice push fit at NO resistance at all for fear of distorting the delicate sleeve. After checking the bore for nicks and dents, you can run down a reamer if you got one, provided it is not blunt at all, and if still not lucky to push the sleeve in to its stop, you could smear some extra fine abrasive paste up the bore and use the brass sleeve itself for lapping it up the bore. I got paste of 5 micron , diamond or the like and screw the sleeve on the end of a threaded rod for manipulating it up the bore. Just see that the paste stays up the bore mostly so you don´t enlarge the bore at the entrance too much. Sure, you get a tiny taper along the bore and sleeve at the top but I do not think it is critical or a negative factor when located in its final position. When up to the stop there is only minimal play in the assembly and wet sumping cannot be a factor after the engine has cooled down and oil got its high viscosity again. So no real need to go for a press fit, too much risk of getting a seizure when knocking the sleeve in and insufficient running clearance for the plunger. Just keep the rear part of the sleeve clean of paste and most of the honing action in front of the sleeve, manipulate the lot in a honing motion with paste and oil, cutting oil is great. </p><p> In case you have to remove substantial material in the bore and your blunt reamer is unable to free cut to size you are entitled to use a secret toolmaker´s trick for restoring the reamer to achieve an individual size. You get a piece of carbide, like a lathe tool insert or a rod of carbide and run it along the cutting edge of the reamer under an angle like in my photo below. That way you create a tiny burr along the flute and so will be cutting the bore to your liking. Be cautious with forming these burrs, you can set the reamer to oversize two or three thou with this trick. You can check with your finger nail at the reamer edge for "size" . </p><p></p><p> Vic</p><p>[ATTACH=full]30066[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 112878, member: 1493"] While reconstructing my Argentina B-Raps I had to deal with same problem a few months ago and decided to get a real nice push fit at NO resistance at all for fear of distorting the delicate sleeve. After checking the bore for nicks and dents, you can run down a reamer if you got one, provided it is not blunt at all, and if still not lucky to push the sleeve in to its stop, you could smear some extra fine abrasive paste up the bore and use the brass sleeve itself for lapping it up the bore. I got paste of 5 micron , diamond or the like and screw the sleeve on the end of a threaded rod for manipulating it up the bore. Just see that the paste stays up the bore mostly so you don´t enlarge the bore at the entrance too much. Sure, you get a tiny taper along the bore and sleeve at the top but I do not think it is critical or a negative factor when located in its final position. When up to the stop there is only minimal play in the assembly and wet sumping cannot be a factor after the engine has cooled down and oil got its high viscosity again. So no real need to go for a press fit, too much risk of getting a seizure when knocking the sleeve in and insufficient running clearance for the plunger. Just keep the rear part of the sleeve clean of paste and most of the honing action in front of the sleeve, manipulate the lot in a honing motion with paste and oil, cutting oil is great. In case you have to remove substantial material in the bore and your blunt reamer is unable to free cut to size you are entitled to use a secret toolmaker´s trick for restoring the reamer to achieve an individual size. You get a piece of carbide, like a lathe tool insert or a rod of carbide and run it along the cutting edge of the reamer under an angle like in my photo below. That way you create a tiny burr along the flute and so will be cutting the bore to your liking. Be cautious with forming these burrs, you can set the reamer to oversize two or three thou with this trick. You can check with your finger nail at the reamer edge for "size" . Vic [ATTACH type="full"]30066[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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