i just took my top end off my 350x and found that the 2 exhaust valves are stuck open. there is no damage to the piston but i guess the piston must have clipped the valves and bent them. i have no idea why though. i checked the connecting rod bearing and that seems ok. the compression release has the cable disconnected. could that have rotated around wrong and held the valves open so they got slapped by the piston? i just replaced the clutch. could i have done something wrong when replacing the clutch. the valve timing is fine as well .............well i took the valves out of the head expecting to find them bent. they were stubborn and i had to pull and twist to get them thru the guides. next i put them in a drill to see how much they were bent and surprise there not! and once i got them out they slide back in and move great! whats the deal???????????any ideas would be appreciated .

 

maybe you have an oil supply problem to the top end. how was the cam journals? the valves might be bent just a little, because there 's not much clearance between the stem and the valve guide so it wouldn't take much to stick. either that or the valve adj. was too tight. you definitely shouldn't have to struggle to get the valves out.

 

thanks i will check it out

 

Siezed valves are kind of a classic overheated head problem. When sufficient heat builds up any oil in the valve guides cooks, litterally glueing the valves in an extended position. Luckily this may not involve any warping or bending. a cleaning may be all that's needed, and find what caused the overheating.