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FJR Motorcycle Forums
Technical & Mechanical Problems
Bent Valves or No?
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<blockquote data-quote="Fred W" data-source="post: 1296770" data-attributes="member: 3828"><p>No, it can, and does, happen all the time. I know the chain seems tightly constrained down at the crank end, but that chain is like a mouse. It gets through cracks you would never expect it to fit through.</p><p></p><p>As you found, if the engine is not at #1 TDC there will very likely be one or more cam lobes depressing a valve. As soon as you loosen that CCT the cams under tension will want to yank the chain one way or the other and it will skip teeth on the crank sprocket. Like I said, this isn't theory. It has happened multiple times before. Yes, you could position the engine at #1 TDC and lessen the chance of this happening, but if you are just changing a CCT how do you know you are TDC unless you remove the timing chain cover? If you bother removing that cover you may as well just ty wrap restrain it (or stuff a socket behind the tensioner guide)</p></blockquote><p></p>
[QUOTE="Fred W, post: 1296770, member: 3828"] No, it can, and does, happen all the time. I know the chain seems tightly constrained down at the crank end, but that chain is like a mouse. It gets through cracks you would never expect it to fit through. As you found, if the engine is not at #1 TDC there will very likely be one or more cam lobes depressing a valve. As soon as you loosen that CCT the cams under tension will want to yank the chain one way or the other and it will skip teeth on the crank sprocket. Like I said, this isn't theory. It has happened multiple times before. Yes, you could position the engine at #1 TDC and lessen the chance of this happening, but if you are just changing a CCT how do you know you are TDC unless you remove the timing chain cover? If you bother removing that cover you may as well just ty wrap restrain it (or stuff a socket behind the tensioner guide) [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Bent Valves or No?
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