1999 "EE" Evinrude 5 thru 15 4-Stroke Service Manual, P/N 787022, Page 124Get this manual
[][[] Use OMC Camshaft Seal Installer, PI 342214 on 9.915 (305cc) or PI 342668 on thru 8, and hammer to tap seal into placeTap until installer contacts head Temperature Switch Test
Purpose heat sensitive switch is installed in the cylinder head to monitor engine temperatureThe switch is connected in series with the warning systemIf the switch senses temperature in excess of predetermined limit, contacts close and cause the System Check gauge "WATER TEMP" light to turn on and the warning horn to sound for ten secondsIf boat is not equipped with System Check gauge, the warning horn will sound continuous tone
INote To ensure that the temperature sensing
system can alert the operator during an overheating condition, test the warning system as described in OMC Accessories Service Manual, System Check Engine Monitor
Testing
1Disconnect the connector and remove the temperature switch from the cylinder head