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With the alternator removed, a very simple job, you should be able to see if the big end bearings and conrod eye have blued, and if there are any metallic fragments in the ‘well’. (Use a magnet, one of those telescopic pocket ones). If the big ends are OK the main bearings might be OK too, and the piston seizure would be the main worry. IF you can get it moving freely you will be able to give it a partial inspection via the transfer ports. If piston metal has ‘wiped’ over the piston rings I’m afraid a strip-down will be necessary. If it looks OK it may be that just the skirt of the piston seized, and it all depends on the amount of damage that occurred. At least if you are able to turn the engine, it becomes a straightforward job to get the barrel off for a proper inspection and repairs. Personally I would not try and restart an engine that has suffered a seizure, as there may be deposits of aluminium in the bore, and damage to the piston is even more likely, both of which will need some attention. If you find metal particles in the crankcase well then obviously some skilled help is vital. And of course your Pilgrim pump needs an overhaul to rectify whatever caused it to fail on one side, assuming of course that it wasn’t a case of very bad ‘adjustment’ that made it stop pumping on one side. The oil tank and feed pipes should also be thoroughly flushed out. When I rebuilt a 1950 Flyer, over thirty years ago, I found a good handful of sand, grit, and small pebbles in the tank. A nasty bit of sabotage ! No wonder the engine had died !