Re: 2 Blade Fan
Don't Know about crack in casting but be sure and scrape the Powder Coating out of the taper area that mounts on shaft. I bought 30 model that had a knock that turned out to be the powder coating had flowed out and left fan loose on water pump shaft ate the keyway and shaft up. Previous owner thought it was Timing gear and replaced them, knock was still there so he sold it as is! I replaced Fan and pump quiet as a mouse now.
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