Thermostat; Thermometer - Subaru XT 1988 Service Manual

2-5
ENGINE COOLING SYSTEM
Be careful not to deform the clip.
Fig. 15
Water pump
case
L2-570
7) Rotate water pump shaft by hand. It should turn
smoothly without emitting noise.
INSTALLATION
Installation is in the reverse order of removal procedures.
Observe the following:
1) Replace the gasket with a new one_
2) After reinstalling the water pump, adjust the drive belt
tension and run the engine to make sure that neither water
leakage nor abnormal noise exists.
Thermostat
REMOVAL AND INSTALLATION
1) Remove the thermostat case cover and gasket, and pull
out the thermostat_
2) Install the thermostat in the intake manifold, and install
the thermostat cover together with a gasket.
a. When reinstalling the thermostat, use a new gasket.
b. The thermostat must be installed with the jiggle pin
upward. (1800 cc model only)
INSPECTION
Replace the thermostat if the valve does not close completely
at an ambient temperature or if the following test shows
unsatisfactory resu Its.
12
Immerse the thermostat and a thermometer in water. Raise
water temperature gradually, and measure the temperature and
valve lift when the valve begins to open and when the valve is
fully opened. During the test, agitate the water for even tem-
perature distribution. The measurement should be to the
specification.
1800
cc
Sub-
valve
2700 cc
Main
valve
Fig. 16
Starts to open
86.5 - 89.Soe
(188 - 193°F)
86 - 90°C
(lS7 - 194°F)
90 - 94°C
(194 - 201°F)
1 Thermometer
2 Thermostat
Thermometer
INSPECTION
Fully opens
100°C (212°F)
102°C (216°F)
A7-021
1) To test the thermometer, connect the gauge section and
the sensor unit in series_
2) The thermometer performance data are shown below.
Temperature
Resistance
[120°C (24SoF)
J
14.9 - 17.3n
100°C (212°F) 26.2 - 29.3n
sooe (176°F)
47.5 - 56.Sn
[50°C (122°F))
133.9 - 178.9n
I