Did you put some sort of reinforcement plate on the front of the WP pulley after you took the fan off? I had one on a donor engine for my Ranger - Turbo Coupes use electric fans. I imagine the flexing of the pulley could allow it to crack, and a dummy fan mount base would help support it for less flexing.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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