Well as some of you here know my motor broke at the DLB Hookie Day run halfway to Windmill Cove.
Motor is now at the machine shop for teardown and inspection to find the cause of the failure. So far, we have a broken camshaft, 4 broken lifters and 1 pushrod down in the pan along with a couple of the lifters. The cam broke in two places...1 break right at the #8 exhaust lobe and the 2nd break at the #4 cam journal...and is wedged between the #7 connecting rod and the crank counterweight.
Basically the story goes...out at the delta Danny and I (DELTA~HOLIC) were running from Orwood to Windmill Cove and he kept dropping fuel pressure and kept having to stop. He got so far behind I stopped the boat to allow him to catch up. He caught up and I fired it back up. Motor fired up, sounded great, had 50psi of oil pressure, motor temp at 140*. I bring the RPMs up to 4000 to get going and motor ran great for one second, heard a bad sounding noise and she was done. Nearest marina was Tiki Lagun so Danny towed me there. On the way there I tried to crank the motor. Motor cranked but kinda sounded very weak, then locked up.
Well upon pulling the headers off I see that the #8 exhaust valve broke right in the middle of the stem. My theory is that the valve broke, causing the spring to relax against the rocker, which applied a ton of pressure to the pushrod/lifter and jammed the camshaft on the exhaust lobe, causing it to break there initially. Then while I was being towed, when I tried to crank the motor over, that section of the cam no longer being supported by the #5 journal was trying to push valves open, and broke in the second spot due to the rear of the cam not being supported.
Theory #2 is that the cam broke for whatever reason, which stopped the #8 exhaust valve mid travel. Upon trying to crank the motor over the piston came up and hit the valve and broke the valve.
In any event, the machine shop will be tearing it down early in the week and hopefully by Tuesday he'll know what caused it and we'll know what all is damaged and will know where to go from here.