Hi everyone, how do you get the chain off the little drive wheel thing on the engine? I tried just moving it around, but the chain wont come off like on a bicycle I would just unscrew the wheel but there are these funny washers with a tab on them that prevent access by a socket...

Also I removed the oil pump, and it seemed that there was some gearbox oil beyond the rubber seal - is this bad? Im still learning...
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'87 MC16