This report describes a procedure that underground coal mine operators may use to comply with the United States Mine Safety and Health Administration's regulation regarding weekly exhaust emissions testing of diesel-powered equipment. The regulation, published in Part 7, Title 30 of the Code of Federal Regulations, will become effective November 25, 1997.(3) The procedure consists of four parts: loading an engine using the torque converter stall method, measuring gaseous emissions while the engine is loaded, recording test results, and based on the results, determining if immediate engine maintenance is required. A portable gas analyzer is used to measure CO (and possibly other emissions) to determine if maintenance is needed. The analyzer is also used to measure CO2 or O2 to verify proper engine loading. Laboratory experiments using this procedure detected an induced engine fault, and two separate field evaluations demonstrated that results could be obtained quickly, accurately, and reproducibly.