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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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<blockquote data-quote="davidd" data-source="post: 112868" data-attributes="member: 1177"><p>I have been lucky with most of mine. I usually test the bore of the oil pump chamber with the pump removed.</p><p>[ATTACH=full]30051[/ATTACH]</p><p>I use a long 1" reamer. I have never had any serious trouble fitting one in a Comet case. As I rotate the reamer I might a a few minor spots that the tool will grab, but nothing dramatic. If I encountered a lot of resistance I would probably continue working with the reamer. However, I like Vincent Speets description of what he does as reamers can often gouge if you are not careful.</p><p></p><p>It sounds to me like the bore of your case has distorted. The oil pumps supplied by Mayghan have been built with an internal clearance that take into account that the bore might be very slightly distorted. Thus, if a Maughan pump sleeve is a tight fit on the worm, that tight fit is telling you that the bore needs serious attention.</p><p></p><p>It is not unusual that the sleeve is a tap fit, but it should be a very easy fit, not hard. I start the sleeve in a retarded position to its final resting spot and twist it clockwise (the direction of of the installation tool tightening and do it slowly to make certain that the I can twist the sleeve to the correct spot. I sometimes go to far, but the sleeve will come out easily. Test fit the worm. The oval hole usually has some burrs on it. Careful filing will usually fix it easily.</p><p>[ATTACH=full]30053[/ATTACH]</p><p>[ATTACH=full]30054[/ATTACH]</p><p>The cases will absorb an amazing amount of heat. I am with Bill. If you can get the cases warm you can then do localized heating around the pump to pull out the sleeve. You should not get the rest of the case hot enough to worry the Loctite. If the whole case is warm it will not draw away the heat around the pump sleeve so quickly. It is good to do this with all due speed!</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 112868, member: 1177"] I have been lucky with most of mine. I usually test the bore of the oil pump chamber with the pump removed. [ATTACH type="full" alt="DSCN2325.jpg"]30051[/ATTACH] I use a long 1" reamer. I have never had any serious trouble fitting one in a Comet case. As I rotate the reamer I might a a few minor spots that the tool will grab, but nothing dramatic. If I encountered a lot of resistance I would probably continue working with the reamer. However, I like Vincent Speets description of what he does as reamers can often gouge if you are not careful. It sounds to me like the bore of your case has distorted. The oil pumps supplied by Mayghan have been built with an internal clearance that take into account that the bore might be very slightly distorted. Thus, if a Maughan pump sleeve is a tight fit on the worm, that tight fit is telling you that the bore needs serious attention. It is not unusual that the sleeve is a tap fit, but it should be a very easy fit, not hard. I start the sleeve in a retarded position to its final resting spot and twist it clockwise (the direction of of the installation tool tightening and do it slowly to make certain that the I can twist the sleeve to the correct spot. I sometimes go to far, but the sleeve will come out easily. Test fit the worm. The oval hole usually has some burrs on it. Careful filing will usually fix it easily. [ATTACH type="full" alt="Tools 8.jpg"]30053[/ATTACH] [ATTACH type="full" alt="Tools 10.jpg"]30054[/ATTACH] The cases will absorb an amazing amount of heat. I am with Bill. If you can get the cases warm you can then do localized heating around the pump to pull out the sleeve. You should not get the rest of the case hot enough to worry the Loctite. If the whole case is warm it will not draw away the heat around the pump sleeve so quickly. It is good to do this with all due speed! David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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