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Thanks for the reply's. That's my working theory: that the locking nut vibrated off and disappeared into the bowels of the engine and the tappet slowly unscrewed, pressed against the inside of the cap and banged a hole and slowly tapped a threaded hole during its escape.

Not my finest work: https://live.staticflickr.com/65535/52884577726_796490544b_c.jpg By the way it took me 30 min to figure out how to post this picture (and I work in IT). I created an account on flickr, tried all the default image sharing options (none worked), then searched the web for 15 min bef...

Thanks for the reply. I did just as you mentioned and, luckily, did not find any debris in the oil or slinger. It'll be a mystery as to where the tappet made its way to until engine disassembly but I'm intrigued by the hole in the valve cover that looks as if it were drilled and tapped. I wonder if ...

Recently I've noticed a decrease in power - 50% to be precise. Investigation showed that my left cylinder intake tappet retaining screw came loose and allowed the tappet screw to unscrew and begin hitting the aluminum access port util it punched a hole through it and subsequently disappeared. Withou...