In a W115 body style 240D (1974), where does the block heater bolt/screw in? What must I remove (and where is it) from the engine block to install it? What's the size of the bolt?
After 30 years of Ohio salt and snow, I'm guessing it's probably a bolt that's thoroughly rusted to the block, so I'd really welcome any suggestions on removing the bolt as well (aside from a week's treatment with penetrating oil). Thanks so much.