Greetings-
After purchasing this 1982 300 series, I did a lot of maintenance, including removing the crank pulley to replace the front crank seal. 3000 miles later, some noises alerted me to discover that two of the six bolts connecting the crank pulley to the crank "mounting plate"(?) had backed out and the other four bolts had sheared. I honestly can't say that I used any threadlock when installing the bolts. Is the issue as simple as, due to not using threadlock, two bolts backed out, destabilized the connection of the pulley to the plate, eventually causing the other four to shear? I'm about to begin the repair process, and just want to make sure that there isn't an additional potential cause I should be aware of. The plates connection to the crank appears firm. Many thanks.