What causes 1 fouled plug?
Originally Posted by jyeager
I would rule out PCV-based oil consumption or all plugs would be fouled. We know the cylinder is firing, so there is either oil being sucked down the valve guide, or through bad rings, or the injector is stuck open.
Compression test will tell you if there is a problem with rings or valve. Switching injectors will tell you if it's the injector. If neither of those 2 tests shed any light I'd settle on the valve seal.
To answer your question you can bend a valve without bending a push rod. In fact, I don't think you can bend a pushrod without bending a valve IF THE PISTON CONTACTED THE VALVE. Most of the time you bend a pushrod it's from simple valve float. The pushrod comes off the lifter or the lifter comes off the cam and when they meet up again, the lifter is coming up while the rod is coming down and you bend your pushrod...this is NOT due to valve hitting the piston or you WOULD see a bent valve also.
Good luck figuring out your problem.
Compression test will tell you if there is a problem with rings or valve. Switching injectors will tell you if it's the injector. If neither of those 2 tests shed any light I'd settle on the valve seal.
To answer your question you can bend a valve without bending a push rod. In fact, I don't think you can bend a pushrod without bending a valve IF THE PISTON CONTACTED THE VALVE. Most of the time you bend a pushrod it's from simple valve float. The pushrod comes off the lifter or the lifter comes off the cam and when they meet up again, the lifter is coming up while the rod is coming down and you bend your pushrod...this is NOT due to valve hitting the piston or you WOULD see a bent valve also.
Good luck figuring out your problem.
