Question about 1991 Mercury Cougar

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Power steering pully, what size allen need

I need to know what size allen wrench i need to pull the power steering pully.

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I have a 97 chevy dually and i need a diagram of how to change the serpetine belt..its a 7.4 litre

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Tensioner pulley

This doesn't sound like a problem with your idler pulley to me, more like an axle or wheel bearing? But to check your pully just pull it back with the correct tool, some use a square 3/8 or 1/2 regular socket drive and a breakover works great. some you can just get the correct size boxend wrench on it and pull it back, after you have the tension off the belt remove the belt, spin idler pully and see if it is bad, try and wiggle the arm back and forth with a pry bar. it should have very little play in it. I hope this helps you Isolate your problem and Merry Christmas!

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