Lincoln SAE-400 with 2-71 Detroit saved from the scrap heap. Follow as I try to resurrect it. Part 1

Picked this welding machine up for free as it was headed for the dump. It is complete but the engine is locked up. Guy said it sat for 20 plus years and is seized up from weather. Unfortunately that may not be true as the dip stick is bone dry but the coolant is full and clean.
Follow along as I try to salvage this welder and get the engine unstuck.