Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 201Get this manual
Oil Injection System Trouble Shooting Chart TROUBLE SHOOTING THE OIL INJECTION SYSTEM If problem occurs with the oil injection system and the warning horn sounds in pulsating manner, stop engine and check if problem is caused by (1) low oil level or (2) faulty warning sensor
Open the cowling on engine and check oil level in engine reservoir tankIf oil is not to the top of tank, the problem is low oilThere is safety reserve of oil left in the reservoir after the low oil warning is sounded that allows you enough oil for 30 to 40 minutes of full throttle operationRefer to troubleshooting chart to correct the problem
Problem: Oil Level in Engine Oil Reservoir Tank is Low But Not Low in Remote Oil TankPossible Cause Fill cap is leaking air on the remote tankRemote oil hose (blue stripe) is blockedRemote pulse hose (second hose) is blocked or puncturedRemote pulse hose check valve is faulty (this valve is located at the engine end of the hose)A restricted oil outlet filter in the remote tankAir leak in upper portion of oil pickup tubePossible Cause Horn malfunction or open (TAN) wire between horn and engineCorrective Action Make sure O-rings or gaskets are in place and caps are tightCheck length of hose for kinkCheck length of hose for kink or leakageReplace check valve