ISO 789-4:1986 Preview
Agricultural tractors -- Test procedures -- Part 4: Measurement of exhaust smoke
This standard was last reviewed and confirmed in 2015. Therefore this version remains current.
This second edition cancals and replaces the first edition (1982). This part is the fourth of a series of eight. Specifies a method of measuring the smoke emiited by the engines of tractors operating at a steady speed. Annex A gives characteristics of opacimeters; installation and use of theopacimeter is described in annex B; annex C tabulates reference fuel specifications; annex D includes an specimen test report.