Exhaust Emissions System - Crankcase Ventilation: Maintenance

Every 15, 000 miles or 15 months, check for loose, disconnected, or deteriorated hoses. Replace hoses as necessary. Replace check valve. Make sure that fixed orifice at 4-way fitting is clear by passing a 0.039" (1 mm) drill bit through passage on CVCC engines, or a 0.035" (0.89 mm) drill bit for non-CVCC engines.

Fig 1: Honda Crankcase Ventilation System

Courtesy of AMERICAN HONDA MOTOR CO., INC.