Service Procedures

Inspect all hoses for obstruction or internal ruptures of rubber which could seal off passage. Also check for cracks or deterioration of rubber. Inspect rubber grommets at rocker arm covers for evidence of deterioration; replace if not in good condition to prevent leakage of gases. Inspect PCV valve for carbon build-up internally, if build-up is evident, valve should be replaced. If valve appears to be in good condition, clean with suitable solvent and blow out with air pressure. Flame arrester should be washed in solvent and blown out with air. A badly plugged arrester should be replaced. On engines equipped with "Positive" ventilation, vented oil filler cap should be washed with solvent and dried with air pressure.