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I think that there are two posibilities. 1. A brown JD engine usually means an exchange engine. It is possible that the fan blades wer bent and then straightened when the engine was changed. This can cause a stress riser (weak area) to form in the blade. Then at some time in the future, BAM it comes apart with the results you described. You are lucky that no one was "in the line of fire". It is always good policy to replace the fan blades once they have been damaged in any way. They are under a lot of stress and can fail with little or no warning. And as you found out, as a suction fan (as in all cars trucks and most tractors) fails it's blades will pull themselves forward into the radiator or oil cooler. 2. When air was blown directly into the compressor air intake, it probably slammed the butterfly shut instantly which caused the engine to overspeed which resulted in the fan comming apart. In this instance you will be fortunate if there was no other damage to the engine and the compressor. It could be a combination of these two that resulted in the fan comming apart. What was your help thinking? If the airfilter was dirty enough to need cleaning, it shouldn't be cleaned with the compressor running!! A very poor practice. Not only did the fan come apart, but alot of the dirt that was in the filter most likely went right into the compressor. I would have had to tell that guy, "It was nice knowing you". Good Luck
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