Crankcase Ventilation Systems - MAZDA: Maintenance

Clean and check ventilation system every 12, 000 miles. On rotary engine models, check system by connecting a vacuum gauge between ventilation valve and oil fill tube. With engine running at 2500-3000 RPM, vacuum reading must be under 2.36" (60 mm) Hg.

Fig 1: 808 & 1800 Piston Engine Crankcase Ventilation System

Courtesy of MAZDA MOTORS CORP.

Fig 2: Crankcase Ventilation System RX2 & RX3 (1972-73)

Courtesy of MAZDA MOTORS CORP.

Fig 3: Crankcase Ventilation System R100 & RX2 (1971)

Courtesy of MAZDA MOTORS CORP.