Your search for the manual will require patience. Check vintage tractor forums, sign up for email alerts on eBay, and ask local aviation mechanics. Once you have it, treat it as a museum piece—laminate the wiring diagram and keep the original safe from grease.
Brass hammer, puller (specified in manual), feeler gauge, multimeter with capacitance test, high-temp grease (never WD-40). scintilla magneto manual
Measure primary winding between the "kill" terminal and ground. If open, the coil is dead. Rewinding is possible but manual suggests sourcing a NOS (New Old Stock) coil. Your search for the manual will require patience