F 350 4WD Pickup V8-7.3L DSL (1988)
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Thermostat: Service and Repair
NOTE: The specified thermostat does not contain an internal bypass, since the bypass is located in the cylinder block. Whenever the thermostat is
replaced, it Is mandatory that only Motorcraft E5TZ-8575-C or Navistar 1807945-C1 thermostat be installed.
Thermostat Assembly
NOTES:
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Do not attempt to repair the thermostat. It should be replaced if it is not operating properly.
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Check the thermostat before installing it.
REMOVAL
1. Disconnect ground cables from both batteries.
2. Drain coolant from radiator until coolant level is below thermostat.
3. Remove accessory drive belt.
4. Disconnect alternator electrical connectors and remove alternator.
5. Remove the water outlet housing attaching bolts. Bend the radiator upper hose upward and remove the thermostat and gasket.
INSTALLATION
1. Clean the water outlet housing gasket surfaces. Coat a new outlet housing gasket with Perfect Seal Sealing Compound BA-19554-A
(ESR-M18P2-A) or equivalent. Position the water outlet housing gasket on crankcase opening.
2. Install thermostat in crankcase opening with the copper pellet or element toward engine and the thermostat flange positioned in the recess. If
thermostat is improperly installed, it will cause a restricted flow of coolant.
3. Position the water outlet housing against the crankcase. Install and tighten the attaching bolts to 27 Nm (20 ft. lb.).
4. Install alternator and connect electrical connectors.
5. Install accessory drive belt.
6. Fill and bleed the cooling system.
7. Connect ground cables to both batteries.
WARNING: DO NOT STAND IN LINE WITH OR NEAR RADIATOR FAN WHEN REVVING ENGINE.
8. Operate the engine until normal operating temperature is reached, then check the coolant level. Inspect cooling system for leaks.