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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Pump
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<blockquote data-quote="greg brillus" data-source="post: 122636" data-attributes="member: 597"><p>If the pump sleeve is very tight you are better off to make a long threaded puller and slowly wind it out, yes the 5/16" thread in the alloy end cap will pull out. Most often when you install the outer small main bearing race when the case cools, the race will shrink too much and the inner race will be too tight. I have to take the case half to my local engine reco shop where they hone the race larger to allow the inner to fit nicely..........This is very common, and many engines I have pulled apart, this bearing is too tight.........so much so that it makes it difficult to remove the crank assembly. Another issue which can go unnoticed is the timing cover screw just forward of the oil pump locating screw, if this is replaced with the common Allan head cap screws, and over tightened, it can bottom at the very thin end of its hole, this pushes directly against the side of the pump sleeve and will easily distort it. On my friends Norvin race engine this had happened, and it totally destroyed the oil pump, the drive worm, and due to no oil circulation, destroyed the big end as well....... He sent me though some pics of it, and you could see how the problem started...........a bit nasty. The gear teeth on the plunger looked like an apple core with the middle chewed away and the outer left behind.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 122636, member: 597"] If the pump sleeve is very tight you are better off to make a long threaded puller and slowly wind it out, yes the 5/16" thread in the alloy end cap will pull out. Most often when you install the outer small main bearing race when the case cools, the race will shrink too much and the inner race will be too tight. I have to take the case half to my local engine reco shop where they hone the race larger to allow the inner to fit nicely..........This is very common, and many engines I have pulled apart, this bearing is too tight.........so much so that it makes it difficult to remove the crank assembly. Another issue which can go unnoticed is the timing cover screw just forward of the oil pump locating screw, if this is replaced with the common Allan head cap screws, and over tightened, it can bottom at the very thin end of its hole, this pushes directly against the side of the pump sleeve and will easily distort it. On my friends Norvin race engine this had happened, and it totally destroyed the oil pump, the drive worm, and due to no oil circulation, destroyed the big end as well....... He sent me though some pics of it, and you could see how the problem started...........a bit nasty. The gear teeth on the plunger looked like an apple core with the middle chewed away and the outer left behind. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Pump
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