See Figure 1
At the recommended intervals in the maintenance interval chart, the oil filler cap must be cleaned. Disconnect the positive crankcase ventilation hose from the cap and lift the cap from the rocker cover. Soak the cap in kerosene or mineral spirits to clean the internal element of sludge and any blow-by material. After agitating the cap in the solution, shake the cap dry. Reinstall the cap and connect the hose.