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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="oexing" data-source="post: 137349" data-attributes="member: 1493"><p>Greg,</p><p>Lycoming approve Loctite 515 for sealing crank case halves when not having POB No. 4 plus silk thread on there. You certainly keep any studs free from sealant and apply only a very fine bead of sealant as you don´t need more than a minimal film to seal all imperfections. Loctite 515 is roughly same as 518, low strength sealant and not hard to break - provided nobody had overdone it on all sorts of places you don´t want to fill. So your troubles were started not from just the cylinder base faces but by sealant filling most other gaps at same time from exessive use .</p><p> Fretting between crank case halves is a problem in aero engines so my idea definitely no silicon seals to be used there. Loctite types 510, 518, 574 , 515 typically need min. 5 minutes for initial low strength so no, not a resaon to worry about when you got most bolts and nuts ready for assembly. In some places I want to open occasionally like simple covers I get Hylomar as it is easy to clean with acetone . Sometimes rubber (NBR) gaskets for simple places can be reused. But I do not plan to go inside any engine when on the road - a shame to the mechanic I´d say in that kind of "accident " . You would not be prepared to look inside your car engine on holyday trips , any time waiting for technical holdups - or would you ? </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 137349, member: 1493"] Greg, Lycoming approve Loctite 515 for sealing crank case halves when not having POB No. 4 plus silk thread on there. You certainly keep any studs free from sealant and apply only a very fine bead of sealant as you don´t need more than a minimal film to seal all imperfections. Loctite 515 is roughly same as 518, low strength sealant and not hard to break - provided nobody had overdone it on all sorts of places you don´t want to fill. So your troubles were started not from just the cylinder base faces but by sealant filling most other gaps at same time from exessive use . Fretting between crank case halves is a problem in aero engines so my idea definitely no silicon seals to be used there. Loctite types 510, 518, 574 , 515 typically need min. 5 minutes for initial low strength so no, not a resaon to worry about when you got most bolts and nuts ready for assembly. In some places I want to open occasionally like simple covers I get Hylomar as it is easy to clean with acetone . Sometimes rubber (NBR) gaskets for simple places can be reused. But I do not plan to go inside any engine when on the road - a shame to the mechanic I´d say in that kind of "accident " . You would not be prepared to look inside your car engine on holyday trips , any time waiting for technical holdups - or would you ? Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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