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this will not work for the AC Delco or the Pienne pumps found on earlier engines
750-41610/025 Piston assembly
figure 21 and number 3 in figure 22 of the drawing
751-40112 Thermostat housing
If replacing both cylinders at the same time then 2 kits will have to be ordered
288717 Thermostat housing adapter. Used on the Hercules 2300, 3400 and D198 Gas and Diesel engines. DSW this will not work for288717 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