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water pump return line nut is rounded – can't remove 900 1994

I'm really stuck. Bought a '94 940 that's been butchered by at least one mechanic.

Need to replace a mashed up mushroom gasket that's causing a coolant leak. The nut holding the return line to the back of the water pump is rounded. Really rounded. Won't budge.

There's no room to maneuver vise grips. A nut buster won't fit either. I'm thinking of cutting the nut off with my Dremel. Maybe the whole stud.

So is there a tool I can use I'm unaware off? Perhaps a secret technique for removing the nut? And if I get really desperate and lob off the stud, what surprises am I in for when I pull the pump off? Is the stud attached to the back of the water pump? Is it easily replaced?

Thanks so much!

Roger






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