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Thermostat Removal and Installation
Removal
1) Drain coolant referring to "Cooling System Draining" in this
section.
2) Remove intake manifold referring to "Intake Manifold
Removal and Installation" in Section 6A1.
3) Remove generator referring to "Generator Dismounting and
Remounting" in Section 6H.
4) Disconnect water hose (1) and heater hose (2) from each
pipe.
5) Remove thermostat case (3) with thermostat cap (4) and
water inlet pipe (5).
6) Remove water inlet pipe (5) with thermostat cap (4) from
thermostat case.
7) Remove thermostat.
Installation
Reverse removal procedure for installation noting the following
points.
• When positioning thermostat (1) on thermostat case (2), be
sure to position it so that air bleed valve (3) comes at posi-
tion as shown in figure.
• Use new O-rings when installing.
• Adjust water pump belt tension referring to "Water Pump/
Generator Drive Belt Tension Inspection and Adjustment" in
this section.
• Adjust A/C compressor belt tension (if equipped) referring to
"Compressor Drive Belt Inspection and Adjustment" in Sec-
tion 1B.
• Refill cooling system referring to step 7) to 22) of "Cooling
System Flush and Refill" in this section.
• Verify that there is no coolant leakage at each connection.
Thermostat Inspection
• Make sure that air bleed valve (1) of thermostat is clean.
Should this valve be clogged, engine would tend to overheat.
• Check to make sure that valve seat (2) is free from foreign
matters which would prevent valve from seating tight.
• Check thermostat seal (3) for breakage, deterioration or any
other damage.
ENGINE COOLING 6B-11
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