288717 Thermostat housing adapter. Used on the Hercules 2300, 3400 and D198 Gas and Diesel engines. DSW If replacing both cylinders at

If replacing both cylinders at the same time then 2 kits will have to be ordered

570-31240 Piston ring set

751-40112 Thermostat housing

the primer mechanism is very cheap and that's just the stuff you see from the outside

288717 Thermostat housing adapter. Used on the Hercules 2300, 3400 and D198 Gas and Diesel engines. DSW If replacing both cylinders at288717 Thermostat housing adapter. Used on the Hercules D2300 and G3400 engines and the military D198 and 298 engines. This adapter has a 3 8 inch NPT opening on the side. There were similar adapters produced from Hercules and the difference was some adapters had more openings or none at all. This will be item number 20 in the Hercules drawing. NSN