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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
stripped crankcase threads
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<blockquote data-quote="Cyborg" data-source="post: 117081" data-attributes="member: 3426"><p>You could probably get an idea of how deep the hole is and roughly how much is left in the way of threads. The threaded section, assuming your cases are the same as mine is definitely longer than the threaded section on that stud, at least the hole is. You could try cleaning all the crap out of the bottom of that hole. Once you are sure everything is out of there (and it can be packed in there so it feels quite solid) ... if you feel lucky you could run a bottoming tap in there and see if you can gain a few more threads. Might be worth a try making up a new stud if things appear “ok”. I would make the threaded portion longer than what the original was and try to make the threads slightly larger in diameter. You can probably only gain another .002” in diameter or so given the size of the stud. After cleaning out the threads and other crap, rinse it out a few times with acetone and let it dry. Apply some appropriate Loctite and let it set before you do up the nut. If you have a decent bore scope (which I obviously do not) you could take a peek. Personally I would want to have a better excuse to tear the engine apart, but if you did take it apart, no doubt you’d end up with a long expensive list of unrelated reasons why it was a good idea.</p><p></p><p>Ps there are types of Loctite that aren’t bothered as much by oil, but based on my personal experience clean is better... and absolutely spotless is better yet.</p><p></p><p>Getting a long enough tap will be a challenge, but a TIG can fix that.</p><p></p><p>[ATTACH=full]32514[/ATTACH]</p></blockquote><p></p>
[QUOTE="Cyborg, post: 117081, member: 3426"] You could probably get an idea of how deep the hole is and roughly how much is left in the way of threads. The threaded section, assuming your cases are the same as mine is definitely longer than the threaded section on that stud, at least the hole is. You could try cleaning all the crap out of the bottom of that hole. Once you are sure everything is out of there (and it can be packed in there so it feels quite solid) ... if you feel lucky you could run a bottoming tap in there and see if you can gain a few more threads. Might be worth a try making up a new stud if things appear “ok”. I would make the threaded portion longer than what the original was and try to make the threads slightly larger in diameter. You can probably only gain another .002” in diameter or so given the size of the stud. After cleaning out the threads and other crap, rinse it out a few times with acetone and let it dry. Apply some appropriate Loctite and let it set before you do up the nut. If you have a decent bore scope (which I obviously do not) you could take a peek. Personally I would want to have a better excuse to tear the engine apart, but if you did take it apart, no doubt you’d end up with a long expensive list of unrelated reasons why it was a good idea. Ps there are types of Loctite that aren’t bothered as much by oil, but based on my personal experience clean is better... and absolutely spotless is better yet. Getting a long enough tap will be a challenge, but a TIG can fix that. [ATTACH type="full" alt="61143BD5-1550-4161-89EA-A9A5848A9E8A.jpeg"]32514[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
stripped crankcase threads
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