Re: Valve problems on the way home today.

Posted by Owen_Dyneto On 2010/6/11 8:31:42

Doubt it's a worn cam lobe, the video clearly shows both lifters and valves on #8 going up and down. Even if worn somewhat, assuming the valve wasn't bent or stuck, you'd still have compression. I still think the most likely reason is a bent valve, or a piece of broken piston or ring or other debris stuck under the valve head.

PS - assuming I'm correct, running the engine will risk battering the seat and if it gets battered too much to regrind, you'll be faced with installed a valve seat insert which typically involves removal of the engine. The valve is VERY hard but the seat is just cast iron. Time to pull the cylinder head, I'd say.