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SERIES 55 ENGINE COOLING FAN

The engine cooling fan is front mounted and belt driven from the crankshaft pulley. See Figure 25425 . ‪

1.Thermostatically Controlled Engine Fan ‪

Location of Engine Cooling Fan

In most applications, the fan is thermostatically controlled. The fan assembly regulates fan speed and maintains a constant coolant temperature, regardless of variations in the engine load or ambient air temperature. No adjustment of the thermostatic control is necessary. ‪

The groove pulley uses a matched set of drive belts. ‪

Whenever one fan belt is replaced, all belts must be replaced as a matched set. Refer to section for belt adjustment or replacement information. ‪

Repair and Replacement of Engine Cooling Fan

To determine if repair is possible or replacement is necessary, perform the following procedure. See Figure 21999 . ‪

Repair or Replacement of Engine Cooling Fan Flowchart

Removal of Engine Cooling Fan

Remove the engine cooling fan as follows: ‪

NOTICE:

Before removing the fan, check the blades for misalignment or damage. Do not rotate the fan by pulling on the fan blades. Engine and radiator damage could result. ‪

NOTICE:

Once removed, the fan must be stored in a vertical position. If stored horizontally, damage may result. ‪

Note: Fan blades must rotate in a vertical plane, parallel with and a sufficient distance from the radiator core.

  1. Loosen and remove the fan mounting bolts. Remove the fan.
  2. Remove the fan drive belts and fan pulley.
Inspection of Engine Cooling Fan

Inspect the engine cooling fan as follows: ‪

  1. Clean the fan and related parts with clean fuel oil.

    To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure.

  2. Dry the fan and related parts with compressed air.
  3. Inspect the fan blades for cracks or other damage if the blades are cracked or deformed, replace the fan.
  4. Inspect the fan pulley for wear or damage to grooves.
  5. If the grooves are excessively worn, replace the pulley inspect the fan pulley for rust or rough spots.
  6. Rust and minor imperfections may be removed with a crocus cloth soaked in fuel oil.

Installation of Engine Cooling Fan

Install the engine cooling fan as follows: ‪

  1. Install the fan pulley and drive belts.
  2. Install the fan. Tighten the fan mounting bolts to 100 N m (74 lb ft).

    Note: After installing, ensure fan blades rotate in a vertical plane, parallel with and a sufficient distance from the radiator core.