Fan Blade


Coolant pump-mounted fans occasionally require service. They are damaged due to metal fatigue, collision, road hazards, and abuse. Any condition that causes an out-of-balance pump-mounted fan will result in early pump failure. A check for fan problems is a rather simple task.

  1. Remove the belt(s).
  2. Visually inspect the fan blade for cracks, breaks, loose blades, or other damage. Is the fan blade sound? If yes, proceed with step 3. If no, replace the blade.
  3. Hold a straightedge across the front of the fan blade. Are all blades in equal alignment? If yes, proceed with step 4. If no, replace the blade.
  4. Slowly turn the fan blade while looking for any out-of-true condition or other damage.
  5. Turn the fan blade fast and look for out-of-true conditions. An out-of-balance fan assembly can lead to water pump shaft and bearing failure. A noticeable wobble or any blade that is not in the same plane as the rest indicates that replacement is in order.
  6. The fan blade can also be checked by removing it and laying it on a flat surface. If it is straight, all the blades should touch the surface. Never attempt to straighten a damaged cooling fan blade. Bending it back into shape might seem easier (and cheaper) than replacing it, but doing so is risky. Whenever metal is bent, it is weakened.
  7. If the fan blade fails either steps 5, 6 or 7, it must be replaced. Because of to high operating speeds, it is not recommended that repairs be attempted to an engine cooling fan blade.
  8. Be sure to clean all mating surfaces and tighten the fan bolts evenly to avoid causing a cocked assembly.

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