Section 03-03: Engine Cooling
1997 F-250, F-350 and F-Super Duty Workshop Manual
REMOVAL AND INSTALLATION

Thermostat, Water

V-8, Gasoline

Removal

  1. Drain the radiator (8005) so that the coolant level is below the water thermostat (8575). Refer to Cooling System Draining, Filling and Bleeding in the Cleaning and Inspection portion of this section.

  1. Disconnect the bypass hose at the water pump (8501) and water hose connection.

  1. Remove the bypass tube.

  1. Remove the water hose connection (8592) attaching bolts.

  1. Bend the upper radiator hose (8260) upward and remove the water thermostat and water hose connection gasket (8255).

Installation

  1. Clean the water outlet water hose connection gasket surfaces. Coat a new water hose connection gasket with Perfect Seal Sealing Compound B5A-19554-A or D7AZ-19554-BA or equivalent meeting Ford specification ESR-M18P2-A or ESE-M4G115-A.

  1. Position the water hose connection gasket on the intake manifold or cylinder head opening.

  1. Install the water thermostat in the intake manifold opening with the copper pellet or element toward the engine (6007) and the thermostat flange positioned in the recess. If the water thermostat is improperly installed, it will cause a retarded flow of coolant.

  1. Position the water hose connection against the intake manifold (9424) and install attaching bolts. If a 7.5L engine, tighten bolts to 32-37 Nm (24-27 lb-ft). For all other engines, tighten bolts to 16-24 Nm (12-18 lb-ft).

  1. Install the water bypass line and tighten hose connections.

  1. Fill the cooling system as described in Cooling System, Draining, Filling and Bleeding in the Cleaning and Inspection portion of this section.

  1.  WARNING: DO NOT STAND IN LINE WITH OR NEAR RADIATOR FAN BLADE (8600) WHEN ENGINE IS RUNNING.

    Operate the engine until normal operating temperature is reached, then check the coolant level and check for leaks.

    Thermostat Installation, 5.8L

    ItemPart NumberDescription
    18255Water Outlet Connection Gasket
    28592Water Outlet Connection
    3391428Screw, 5/16-18 x 1.25
    48575Water Thermostat
    5391430Screw 5/16-18 x 1.75
    A—Insert with Copper Pellet Towards Engine
    B—Tighten in Sequence Indicated in Text to
    16-24 Nm (12-18 Lb-Ft)

Diesel

Removal

  1. Drain the cooling system. Refer to Cooling System Draining, Filling and Bleeding in the Cleaning and Inspection portion of this section.

  1. Disconnect the drive belt (8620) at the drive belt tensioner pulley (6B217).

  1. Remove the upper radiator coolant hose clamp at the water hose connection and disconnect the upper radiator hose from the water hose connection.

  1. Remove retaining screws and the water hose connection.

  1. Remove the thermostat housing O-ring and water thermostat.

Installation

  1. Install the water thermostat O-ring.

  1. Position the water hose connection. Install retaining screws and tighten to 20 Nm (15 lb-ft).

  1. Connect the upper radiator hose to the water hose connection and install hose clamp at the water hose connection.

  1. Install the drive belt at the drive belt tensioner pulley.

  1. Refill and bleed the engine cooling system as described in Cooling System, Draining, Filling and Bleeding in the Cleaning and Inspection portion of this section.