4. LUBRICATION SYSTEM VITALITY 50 INSTALLATION O-rings Dowel Pin Install the O-rings and dowel pin. Inspect the O-rings and replace if damaged. Bolts Install the oil pump and tighten the bolts. Make sure that the pump shaft rotates freely without binding. Oil Pump Oil Pump Gear Install the oil pump gear and tighten the nut. Nut 4-13