Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 323Get this manual
Be careful not to get dirt or other contamination In tanks, hoses or other components of the oil Injection system during Installation
crankshaft and is co nnected to the throttle linkage for metering the varied flow of oil per engine RPM Final Checks Before Operation of Engine Make sure fill cap gaskets are in place and caps are igh on engine oil reservoi and remote oil tank Mix gasoline and oit mixture of 50: in the remote fuel ta nk during the initial break-in of the en gineBe certa in the warning horn is installed and is operationalRefer to Instrument and Warning Horn InstallationEach time the key switch is turned from theoff" to "o n" posit ion (engine not running); the warni ng horn wi ll sound momen tarily This tells you the wa rn ing system for the oil injection system is functional and the warning horn is operati onalIf warning ho rn does not sound or horn stays on when key is tu rned to the "O N" position, refer to oil inj ection system troubleshooting chart following to correct the problem
Oil injected engines additionally, must be run on 50:1 gasoline oil mixture in the fuel tank for the first 100 gallons of fuelRefer to engine break-In procedures In the OperationMaintenance Manual