When my starting batteries are dead I wrap a rope around the pulley on the front of the engine and pull. It may work. LMAO
A decade or so ago in one of the sailing around-the-world races, one of the contestants lost his starter motor. They run the engine to charge the battery, need to keep the instruments and autopilot going. To start it, they came up with a scheme involving wrapping a line around the flywheel, running it to the end of the boom, then doing an abrupt jibe. When the boom came across it yanked the line and started the engine (these boats have 1500 sq ft mainsails). Finished the race that way. Hard to duplicate on a trawler though.