1995 Johnson Evinrude "EO" 60 LV 90, 115, 150, 150C, 175 Service Manual, P/N 503151, Page 134Get this manual
Engine Temperature Check The Markal Thermomelt Stik is heat-sensitive marker that melts on contact with surface of specific temperatureOne source of Thermomelt Stiks is Stevens Instrument Company
f1l At least two Thermomelt Stiks or digital pyrometer should
be used to accurately determine the engine's operating temperatures
The Thermomelt Stik mark will appear dull and chalky when the surface marked is below the Stik's rated temperatureWhen the surface exceeds the Stik's rated temperature, the mark will appear liquid and glossyf21 To achieve accurate and consistent readings, engine temperature must be gauged at the top of each thermostat pocketTo troubleshoot and isolate cooling system problem properly, be sure to test both cylinder headsFor the following engine operating temperatures and RPM figures to be correct, the inlet water temperature must be 70 10 (21 3)Pyrometer Procedure