I have the impeller nut tool and a spline socket. Just extremely difficult to break nut loose.
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Soak it down with penetrating oil, the next day, heat it up, a MAP torch is plenty hot, then with a breaker bar or impact, put pressure on it while hitting it with a hammer. It will go.
If it feels like your going to break something, or hurt yourself, stop and drill some holes through the nut at the key slot and cut it with a cold chisel.
It should virtually fall off then.
GT
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