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The distributor to head bolt was loose, in order to adjust the timing. When the spring caught in the distributor mechanism, it stopped that from rotating and subsequently the helical gears forced it out of the block. But my question is whether there are any internal differences in the various Bosch ...

Hi all, I have a 1976 520 with a 78-80-ish 528i motor and running gear in it. The car has been off the road since 1994 and I'm the fourth or fifth owner since then. The motor is rebuilt, and looks wonderful, but I've struggled a lot with sorting out little issues to get it running properly. In the e...