Engine System - Diagnosis and Tests/Using STANADYNE ’’TIME-TRAC’’ as Tachometer CTM3274 (01JUL99) 210-11 Saran Liter Engines 060799 PN=334 INSPECT THERMOSTAT AND TEST OPENING TEMPERATURE Visually inspect thermostat for corrosion or damage. Replace as necessary. • Test thermostat as follows: N CAUTION: DO NOT allow thermostat or thermometer to rest against the side or bottom of container when heating water. Either may rupture if overheated. 1. Remove thermostat. -UN-23NOV97 2. Suspend thermostat and a thermometer in a container of water. 3. Stir the water as it heats. Observe opening action of thermometer and compare temperatures with RG5971 specification given in chart below. NOTE:
Due to varying tolerances of different suppliers, initial opening and full open temperatures may vary slightly from specified temperatures. THERMOSTAT TEST SPECIFICATIONS Rating Initial Opening Full Open (Range) (Nominal) 71˚C (160˚F) 69—72˚C (156—162˚F) 84˚C (182˚F) 77˚C (170˚F) 74—78˚C (166—172˚F) 89˚C (192˚F) 82˚C (180˚F) 80—84˚C (175—182˚F) 94˚C (202˚F) 89˚C (192˚F) 86—90˚C (187—194˚F) 101˚C (214˚F) 90˚C (195˚F) 89—93˚C (192—199˚F) 103˚C (218˚F) 92˚C (197˚F) 89—93˚C (193—200˚F) 105˚C (221˚F) 96˚C (205˚F) 94—97˚C (201—207˚F) 100˚C (213˚F) 99˚C (210˚F) 96—100˚C (205—212˚F) 111˚C (232˚F) 4. Remove thermostat and observe its closing action as it cools.
In ambient air the thermostat should close completely. Closing action should be smooth and slow. 5. If any thermostat is defective on a multiple thermostat engine, replace all thermostats. CD,CTM125,229 -19-01DEC97 210 11