I have been working on my 1977 400D and I get the engine to crank and spin freely until it makes a groaning noise like something rubbing against it inside. Could this be a timing issue or should I look at a starter problem....or worse? I wish I could describe it better, it can come and go during the same starter cycle. I have never had any experience with a point ignition since the early 70's so I am grasping at straws here. Suggestions?
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