2008 Evinrude E-TEC 55MFE Technical Manual, Page 182Get this manual
COOLING SYSTEM PRESSURE RELIEF VALVE SERVICING
PRESSURE RELIEF VALVE SERVICING
The pressure relief valve assembly should be serviced at the same time as the thermostat
Inspection
Inspect all parts for cracks, heat damage, or signs of corrosionReplace damaged partsClean debris from housing and parts
Disassembly
Remove screws and cover from pressure valve assembly
Pressure Relief Valve Assembly Components
Assembly
Assembly is the reverse of disassemblyPay close attention when performing the following additional tasksInstall new plunger seal squarely over ridge in housing002443