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I'm having an issue greasing a ball joint in my bronco--it's a '90, 351, eddie bauer, if that helps. The BJ in question is on the front, passengers side. Before I attempted greasing I jacked up the vehicle, as I read that it helps to take the weight off the BJ.
At first the grease was coming out at the zerk. Upon closer inspection, I could see that the zerk fitting was crossthreaded. I removed the fitting, and tried to pump grease through it. Worked fine. I then managed to rethread it correctly, so that the grease doesn't spew out. In fact, now I can't pump in any at all. I read that the zerk can be screwed in too far, so I tried backing it off a good bit. Same thing: no grease in, and no grease out. I found a cutaway of how a ball joint is built, and after looking at it, I'm wondering if it's possible for the joint to rust up and block the grease from going into the cup. Here's the picture, for reference(click it to see full-sized version):
Anyway, as I know WD-40 and ducktape can fix just about anything, I was thinking of squirting some of the former under the rubber cup to try and break up any interior rust that might be blocking the grease from going in. I'm out of ideas otherwise. Am I on the right track here, or am I headed for trouble?
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