Those Delco starters will sometimes hold themselves engaged if the engine does not crank over fast enough so that compression pushing a piston down can release some of the starter load. When the starter stays under load the spring in the solenoid may not be strong enough to disengage the drive from the ring gear. This causes the drive to hold the plunger in the engaged position causing the starter to keep cranking. If you do not find any electrical problems this is most likely what you will find. This is much more common with eight cylinder engines than a four cylinder engine.
From your description it sounds like you are not getting enough cranking speed on the engine when you are trying to start it. Make sure your battery is in good shape and your cables and connections are good. It would be good to know how much draw you have when cranking. If everything checks out electrically excessive draw will indicate a mechanical problem with the engine.
I have run across some of those German engines that had such a minor seeping of antifreeze from the sleeve o-rings that the lost antifreeze was never noticed in the oil. A small amount of antifreeze in oil can cause a "sticksion" problem. The oil gets so sticky that it takes a great deal of force to start to turn the crankshaft but after only a partial revolution it frees up and turns almost normally. With the starter out, try turning the flywheel to see if it takes excessive force to start to rotate it.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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