Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 361Get this manual
3 Litre Oil Injection System
FINAL CHECKS BEFORE OPERATION OF ENGINE
A CAUTION
Verify fill cap gaskets are in place and caps are tight on engine oil reservoir and remote oil tank Mix gasoline and oil mixture of 50: in the remote fuel tank during the initial break-in of the engineBe certain the warning horn is installed and is operationalRefer to Instrument and Warning Horn InstallationEach time the key switch is turned from the "off' to "on" position (engine not running); the warning horn will sound momentarilyThis tells you the warning system for the oil injection system is functional and the warning horn is operationalIf warning horn does not sound or horn stays on when key is turned to the "ON" positionrefer to oil injection system troubleshooting chart fol lowing to correct the problem
00 NOT allow dirt or other contamination to enter tankshoses or other components of the oil injection system during installationManual
CAUTION