4. LUBRICATION SYSTEM DOWNTOWN 125i Arrow Mark INSTALLATION Install the oil pump and oil separator and tighten the two bolts. The arrow mark must be keep upward. Make sure the pump shaft rotates freely and arrow on the oil pump is upside. Oil Separator Bolts Pump Drive Chain Snap Ring Install the pump drive chain and driven gear, then set the snap ring securely on the pump shaft. Pump Driven Gear Snap Ring Bolt Install the oil separator cover properly. Fit the tab of the separator cover into the slit in the separator. Oil Separator Cover 4-4