Description & Operation: 928S

Blow-by gases are routed from crankcase to an oil separator where any excess oil drains into oil pan. Blow-by gases continue to lower section of air cleaner. A pre-heating line runs across part of the vent hose. This helps keep blow-by gases at a temperature which is more suitable for combustion once they are taken into combustion chamber. A flame guard is also installed in inlet adapter of air cleaner (lower portion) to prevent backfire flame from reaching crankcase.