1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 151Get this manual
Thermomelt Stile Procedure 1Install correct test propeller and place engine in test tank
i twist and remove all spark plug leads
To avoid accidental starting of engine while servicing,
2Start engine and run at 3000 RPM for at least five minutes
L!J heads with 1250 (520 C) and 1630 (730 C) Thermomelt Stik4At 900 RPM, the 125 (52 C) marks should remain liquid and glossyThe 1630 (73 C) marks should remain dull and chalky If the 1250 (52 C) marks do not remain liquid and glossy, troubleshoot the cooling system for causes of overcooling If the 163 (73 C) marks become liquid and glossy, troubleshoot the cooling system for causes of overheatingf41 5When the engine speed is increased to 5000 RPM, both 1630 L!J (730 C) marks should remain dull and chalky If the marks become liquid and glossy, troubleshoot the cooling system for causes of overheating0 0