CYLINDER BLOCK AND CRANKCASE
Page 4B–30 90-857138R1 MAY 2000
Measuring/Testing Thermostat
1. Inspect thermostat, replace if stuck or damaged.
2. Use Measurement Test following to measure:
a. Valve opening temperature.
b. Valve lift.
MEASUREMENT TEST
1. Tie a piece of thread (or other non-conductive material) onto the thermostat.
2. Suspend the thermostat in water.
3. Heat water slowly while observing the thermostat.
a
a-Valve Lift
Water Temperature
Valve Lift
Below 122° F (50° C) 0 in. (0 mm)
Above 145° F (67° C) Minimum 0.12 in. (3 mm)
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