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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil, is there a definitive answer?
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<blockquote data-quote="greg brillus" data-source="post: 172570" data-attributes="member: 597"><p>I've had a few cranks apart that either showed wear on the pin and the rod liner........a loss in the oil delivery for whatever reason is an obvious culprit........another issue I've seen is on some big ends, the rollers are quite a bit larger in diameter than the originals.......some say 3/16" in diameter or so........because of this, the liner that presses into the rod large eye bore is very thin.......I've seen these either crack very badly and/or a slither of metal cracks away at the edge........in one case this actually locked the crank up all together. Often the new big end assembly might come with the liners actually slightly oversize........obviously so you can hone the rod eye larger to true it up, but if this was not done, then the liner will be an overly tight fit in the rod.......this could cause too much stress on the liner and cause it to crack.......perhaps.......the sides of the rod/liner should have small grooves ground into them to allow the spent oil to drain away.......some rod to side plate clearance is too tight and very little side play.......obviously it will be difficult for any oil to pass if this is the case. I have one in the shop now with a total failure of the pin and rod liners.......the oil delivery holes in the pin were pointing straight up........my guess is this is wrong as the load is max at that point..........Lots of things to consider with the crank/rods.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 172570, member: 597"] I've had a few cranks apart that either showed wear on the pin and the rod liner........a loss in the oil delivery for whatever reason is an obvious culprit........another issue I've seen is on some big ends, the rollers are quite a bit larger in diameter than the originals.......some say 3/16" in diameter or so........because of this, the liner that presses into the rod large eye bore is very thin.......I've seen these either crack very badly and/or a slither of metal cracks away at the edge........in one case this actually locked the crank up all together. Often the new big end assembly might come with the liners actually slightly oversize........obviously so you can hone the rod eye larger to true it up, but if this was not done, then the liner will be an overly tight fit in the rod.......this could cause too much stress on the liner and cause it to crack.......perhaps.......the sides of the rod/liner should have small grooves ground into them to allow the spent oil to drain away.......some rod to side plate clearance is too tight and very little side play.......obviously it will be difficult for any oil to pass if this is the case. I have one in the shop now with a total failure of the pin and rod liners.......the oil delivery holes in the pin were pointing straight up........my guess is this is wrong as the load is max at that point..........Lots of things to consider with the crank/rods. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil, is there a definitive answer?
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