I read the bulletin once, and it says the chain just slaps the cover for a second and it does NOT have enough clearance (even with no oil pressure) to allow the chain to jump. For this reason, it is considered a non critical item to replace. Just a nuisance with it's noise. Mine's done it for a couple years or so. If you put on a good filter like NAPA gold or something, it DOES minimize the time lapse and severity of the sound, but it still seems to always exist on mine. I just turn the radio up before I start it (my stereo is wired to work in the crank position on the keyswitch).
