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FJR Motorcycle Forums
Technical & Mechanical Problems
Killed my Engine
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<blockquote data-quote="Hit the Road Jack" data-source="post: 314563" data-attributes="member: 5454"><p>I would surmise from viewing the cam drive illustration (<a href="https://parts.yamaha-motor.com/partimage.gifx?d=92020,2,0" target="_blank">https://parts.yamaha-motor.com/partimage.gifx?d=92020,2,0</a>) that one of the three cam-chain guides has worn through or disintegrated due to low chain tension, possible allowing the chain to slip/not engage the crankshaft sprocket. Most likely the aft side tension guide has gone bye-bye, which would explain the tensioner events you experienced. You'll probably find bits of worn Delrin in your oil-pan. Hopefully, your valves survived intact. Only a head removal will tell for sure, which you'll need to do to recover the cam drive tensioner(s). Good luck!</p><p></p><p>I too have, in my distant past, witnessed a matched set of eight bent valves result from my wife's POS '82 Ford Escort timing belt slippage due to an on-the-road water pump replacement (by a moron)!</p></blockquote><p></p>
[QUOTE="Hit the Road Jack, post: 314563, member: 5454"] I would surmise from viewing the cam drive illustration ([URL="https://parts.yamaha-motor.com/partimage.gifx?d=92020,2,0"]https://parts.yamaha-motor.com/partimage.gifx?d=92020,2,0[/URL]) that one of the three cam-chain guides has worn through or disintegrated due to low chain tension, possible allowing the chain to slip/not engage the crankshaft sprocket. Most likely the aft side tension guide has gone bye-bye, which would explain the tensioner events you experienced. You'll probably find bits of worn Delrin in your oil-pan. Hopefully, your valves survived intact. Only a head removal will tell for sure, which you'll need to do to recover the cam drive tensioner(s). Good luck! I too have, in my distant past, witnessed a matched set of eight bent valves result from my wife's POS '82 Ford Escort timing belt slippage due to an on-the-road water pump replacement (by a moron)! [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Killed my Engine
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