Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

After seeing Gils replacement crankshaft, i would advise not using a drill to start the M91. The high torque of a drill can cause the 5 piece crankshaft to loosen where the shaft is pressed together, causing continual timing changes and other problems. I learned this the hard way, and started making rope start pulleys for any engines that don't have a 1 piece crankshaft.
crazydoug