4. LUBRICATION SYSTEM MXU 500 IRS Oil Pump Drive Chain Guide OIL PUMP REMOVAL/INSPECTION/ INSTALLATION REMOVAL Remove the flywheel and driven gear (refer to the "STARTER CLUTCH REMOVAL/INSPECTION/INSTALLATI ON" section in the chapter 19). Remove the two bolts and oil pump drive chain guide. Oil Separator Cover Remove the two bolts and oil separator cover. When removing and installing the oil pump, use care not to allow dust or dirt to enter the engine.. Remove snap ring. Snap Ring Drive Chain Remove the oil pump driven gear, then remove the oil pump drive chain. Driven Gear 4-5