Was out on the delta Friday and my boat broke down. Started it up, idled fine, motor sounded great. Water temp was about 140* and oil pressure was up at 50psi. Swung it up gradually to 4,000RPM and heard a noise, and the motor instantly died. Got towed in by a friend and as he was towing me, I turned the key, the motor cranked over kinda weak sounding, then it locked up.
On a hunch I pulled the valve covers off, and two of the pushrods are nowhere to be found! Somehow they came out and I'm assuming they ended up in the rotating assembly which is what is locking it up. I checked the oil and there's no water in it, so I doubt the pushrod ever punctured the cylinder walls. I haven't torn the motor apart yet.
What could have caused this to happen?
What are the chances of the rotating assembly being undamaged by the pushrod that is stuck in it?