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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lifter exhaust - Vincent Comet Serie C
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<blockquote data-quote="ClassicBiker" data-source="post: 55299" data-attributes="member: 1632"><p>Michel,</p><p>Glad nothing went walkabout in your timing chest. For the exhaust lifter to work on a cold engine and not lift the exhaust valve on a warm engine something must either be expanding or moving with the heat of the engine and introducing slack into the system. That or there is a loss of rigidity with some component once warm. Myself, I think I might be inclined to warm the engine to the point the exhaust lifter didn't work, remove the cable, the cable abutment (ET172), the spacer (ET168), and hook the cable anchor (E218) with something such as a screw driver to determine if the problem is within the timing chest or perhaps the cable is getting a bit spongy with heat. If it wasn't the cable at fault I would look to see what was happening to ET172, ET168, E217, and E218 once warm. My reasoning being ET168, ET172, and E217 all transfer the pressure of the outer cable to the crankcase, if they are not rigid and maintaining their position relative to the outer crankcase when warm then they are introducing slack and lost motion to the system. I suspect E217 of being loose in the case when warm and when you squeeze the lever of it moving into the case and E223 the return spring pushing it out again. When cold the case has sufficient grip for all to work. Keep me posted please, I'm interested to know what the actual cause of your problem is once you find it.</p><p>Steven</p><p>[ATTACH=full]2979[/ATTACH]</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 55299, member: 1632"] Michel, Glad nothing went walkabout in your timing chest. For the exhaust lifter to work on a cold engine and not lift the exhaust valve on a warm engine something must either be expanding or moving with the heat of the engine and introducing slack into the system. That or there is a loss of rigidity with some component once warm. Myself, I think I might be inclined to warm the engine to the point the exhaust lifter didn't work, remove the cable, the cable abutment (ET172), the spacer (ET168), and hook the cable anchor (E218) with something such as a screw driver to determine if the problem is within the timing chest or perhaps the cable is getting a bit spongy with heat. If it wasn't the cable at fault I would look to see what was happening to ET172, ET168, E217, and E218 once warm. My reasoning being ET168, ET172, and E217 all transfer the pressure of the outer cable to the crankcase, if they are not rigid and maintaining their position relative to the outer crankcase when warm then they are introducing slack and lost motion to the system. I suspect E217 of being loose in the case when warm and when you squeeze the lever of it moving into the case and E223 the return spring pushing it out again. When cold the case has sufficient grip for all to work. Keep me posted please, I'm interested to know what the actual cause of your problem is once you find it. Steven [ATTACH=full]2979[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lifter exhaust - Vincent Comet Serie C
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