1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 169Get this manual
Troubleshooting Bleeding Air From Oil Injection System CAUTION
If air exists in either oil pump hose (inlet or outlet), the air MUST BE bled from hose(s) or engine damage may occurBLEEDING AIR FROM OIL PUMP INLET HOSE With engine not running, place shop towel below oil pumpLoosen ble ed screw thre to four turns and allow air bubbles to exit inlet hoseTorque ble ed screw to 25 lbin(2.8 m)This procedure also allows oil pump to fill with oilBLEEDING AIR FROM OIL PUMP OUTLET HOSE Purge air from outlet hose by running engine (on 50:1 gasolineoil mixture in fuel tank) at idle spe ed until no air bubbles are present in outlet hose
Oil Pump Volume (Flow) Test WARNING
The input fuel line TEE fitting from which the oil line was removed MUST BE CAPPED OFF to prevent fuel leakage while the engine is running