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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="greg brillus" data-source="post: 144624" data-attributes="member: 597"><p>My first question to this is........what if any prep was done to see that the head to liner joint is correct.........most are not........this leads to leaks, the next course of action is to pull the heads down even more........I had a barrel/head combo recently that was assembled with loads of what looked like loctite 518 or similar...... I had to heat the joint with a blow torch, then drive the 2 apart with a sharp wood chisel to separate them..........don't panic, very little if any damage was done........and yes I did try a large block of hardwood down the bore with blows from a hammer to no effect........Plenty of engines out there who's head nuts are torqued way too much.........This generally will result in the lower stud threads in the crank case failing........The thought being that if you tighten them more, then you don't need to re torque them later........Well I guess we all like to think of our bikes as being the ultimate classic bike........Bit like the "Titanic" and we all know what happened to that.......The fine alloy threads in these crank cases do in fact have an "elastic limit".........Race or road engines........Low or high compression.......no matter........30 to 32 Ft Lb's is all you need.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 144624, member: 597"] My first question to this is........what if any prep was done to see that the head to liner joint is correct.........most are not........this leads to leaks, the next course of action is to pull the heads down even more........I had a barrel/head combo recently that was assembled with loads of what looked like loctite 518 or similar...... I had to heat the joint with a blow torch, then drive the 2 apart with a sharp wood chisel to separate them..........don't panic, very little if any damage was done........and yes I did try a large block of hardwood down the bore with blows from a hammer to no effect........Plenty of engines out there who's head nuts are torqued way too much.........This generally will result in the lower stud threads in the crank case failing........The thought being that if you tighten them more, then you don't need to re torque them later........Well I guess we all like to think of our bikes as being the ultimate classic bike........Bit like the "Titanic" and we all know what happened to that.......The fine alloy threads in these crank cases do in fact have an "elastic limit".........Race or road engines........Low or high compression.......no matter........30 to 32 Ft Lb's is all you need. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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