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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 414 (Engine Cooling System - Excursion & F250-F550 Super Duty Pickup) >> Diagnosis And Testing >> Engine Cooling >> Component Tests >> Fan Clutch Test - Minimum Speed Requirement

Fan Clutch Test - Minimum Speed Requirement

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use a suitable marker to mark the coolant pump pulley (8509), one of the fan blade retaining bolts and the crankshaft pulley (6312).
  2. Connect a tachometer to the engine.
  3. Install a throttle adjusting tool.
  4. Connect the Digital Photoelectric Tachometer.
    5. WARNING: To avoid the possibility of personal injury or damage to the vehicle, do not operate the engine until the fan blade has been first examined for possible cracks and separation.
  5. Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved.
  6. Operate the strobe light at 4,320 rpm for 5.4L and 6.8L engines and 3600 rpm for 7.3L diesel engines, and aim it at the coolant pump pulley. Adjust the engine speed until the light flash and the coolant pump pulley mark are synchronized.
  7. Aim the strobe light at the fan blade bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
  8. The fan blade speed must not be greater than 1,900 rpm on 5.4L engines and 2,000 rpm on 6.8L and 7.3L engines.
  9. Turn the engine off.
  10. If the fan blade speed was greater than 1,900 rpm (on 5.4L) (on 7.3L diesel engines and 6.8L, 2,000 rpm), install a new fan clutch (8A616).
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