La318 cylinder head question
You said that you had a stuck valve.
now you say it's not stuck.
How did you diagnose this?
a cylinder balance test?
a Compression test?
a Leak-down test?
The sound the pistons make when they hit the hung-open valve?
The 12.5% powerloss?
Maybe it's time to back up the us and start over?
I diagnosed it by:
1-Loud ticking noise from drivers side
2-rough running
3-power loss
4-compression test showing 60psi on that cylinder, only improving to 65 with a wet test, while all the rest are 115-120psi
5-valve marks on the piston top
6-backfire through carb on acceleration
7-burning oil from that side of wngine
Now, looking at the piston top with borescope, it looks more like the exhaust valve, based on the position of the valve marks on the piston. Which seems odd with the backfire through the carb, but I’ll see for sure once I get the head off.
Edit: definitely the exhaust valve. Not sure why it hit, lifter is moving freely, pushrods aren’t bent, I’ll pull the valves later this week and see if any are bent?
Any ideas on what else would cause just one valve, in just one cylinder to hit the piston a few times, and that cylinder to have super low compression on a wet and dry compression test?