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FJR Motorcycle Forums
Technical & Mechanical Problems
Killed my Engine
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<blockquote data-quote="jestal" data-source="post: 314362" data-attributes="member: 477"><p>Sounds bad but hope for the best. If the chain just managed to drop off the crank sprocket the cams may not be turning causing no compression.</p><p></p><p>I can just about guarantee you that the engine is not "free spin." Few engines are, actually, despite many that claim to be. If a cam stops turning and a valve is held open enough it will hit the piston. Reliefs are there for running clearance, not for "free spin" purposes. But, there are a lot of places the cams can stop and not hit the valves into the pistons so cross your fingers.</p><p></p><p>PM me and I'll give you my phone number and talk you thru what to check. It really isn't that hard to correct, hopefully. If you can do a valve lash check you are there with some info. Even if something touched the head will have to come off but certainly nothing worse than replacing a few valves.</p><p></p><p>To make you feel better it is highly unlikely that ALL the valves could be bent....damn near impossible. Point is that no compression can come from just the cam not turning, not because of a bent valve. Stop turning it over until you find out more!! You'll just do more damage.</p></blockquote><p></p>
[QUOTE="jestal, post: 314362, member: 477"] Sounds bad but hope for the best. If the chain just managed to drop off the crank sprocket the cams may not be turning causing no compression. I can just about guarantee you that the engine is not "free spin." Few engines are, actually, despite many that claim to be. If a cam stops turning and a valve is held open enough it will hit the piston. Reliefs are there for running clearance, not for "free spin" purposes. But, there are a lot of places the cams can stop and not hit the valves into the pistons so cross your fingers. PM me and I'll give you my phone number and talk you thru what to check. It really isn't that hard to correct, hopefully. If you can do a valve lash check you are there with some info. Even if something touched the head will have to come off but certainly nothing worse than replacing a few valves. To make you feel better it is highly unlikely that ALL the valves could be bent....damn near impossible. Point is that no compression can come from just the cam not turning, not because of a bent valve. Stop turning it over until you find out more!! You'll just do more damage. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Killed my Engine
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