Cooling System Investigation of the 3-kW MEP Models 016A, 021A, and 026A (60Hz, 400-Hz, and 28-V d.c.) Gasoline-Engine-Driven Generator Sets,

The purpose of this report is to describe the characteristics of the cooling system on the MIL STD 3-kW, Models MEP 016A 60-Hz, 021A 400-Hz, and 026A 28-V d.c. gasoline-engine-driven generator sets from the viewpoint of design modifications necessary to alleviate chronic engine overheating prroblems experienced when the sets are operated in high ambient temperatures andor operated in revetted walled locations. The investigation covers the history of the cooling system on the Model 4A032 6-hp MIL STD engine and how the cooling system was altered and compromised when the engine was applied to 3-kW generator set. The report describes experimental modifications made to the set cooling system which allowed the set to be operated inside an acoustic enclosure without overheating the engine. These improvements to the engine and generator cooling systems could be considered for incorporation into future production 3-kW MIL STD gasoline-engine-driven generator sets. Author