Description & Operation: 928

Blow-by gases are routed from crankcase to an oil separator where any excess oil in the gases can settle and flow back to oil pan. From oil separator 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 adaptor of air cleaner (lower portion) to prevent backfire flame from reaching crankcase.