Are all m20 water pumps reverse threaded for the fan? I have spent the entire afternoon trying to separate my fan and water pump so that I can replace the pump. The new pump I bought clearly has reverse threads, but I am unable to brake the nut loose by rotating it clockwise (if you were looking from the front of the fan. I have the pulley held in place with a flat bar between the screws and a 4 foot piece of pipe around an open ended wrench on the nut. I have put A LOT of torque on the nut, but it won't brake loose. Could it be normal instead of reverse threads? It's on an 87 325e.
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It's reverse threaded. Try impact instead of the torque route. Put the wrench on it and go to town with the hammer. -
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I built a pulley holding tool by drilling a couple holes in a steel bar. I have the bar clamped into a table vice and have hit the wrench with a mallet probably a hundred times. This nut is not coming off.
Maybe the previous owner used loctite? I'm going to try some heat tomorrow but other than that, I have no idea what else to try.Comment
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Most likely the po used locktiteOriginally posted by SonnyComment
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you need a chain wrench, always work with other project as well.Comment
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Would you put it around the pulley? I snapped an oil filter strap wrench yesterday trying this. The holder tool that I built holds the pulley very solid, but I still can't brake the nut free.Originally posted by mr.vang View PostComment
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Maybe you're just a wuss?
But seriously, try smacking it with a bigger hammer. Rubber/plastic isn't going to cut it. You need metal to impart a shock into the nut.Comment
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Haha apparently you are right about me being a wuss. My buddy finally got it off this afternoon (I must have loosened it for him).Originally posted by AndrewBird View Post
We just kept using bigger and bigger hammers and more penetrating oil. Finally it broke free after probably 30 hits using a heavy sledge hammer.
I don't see how this would have been possible if the water pump was still in the car. I'm curious how it got so tight (there was no thread locker). Maybe whoever worked on the car last didn't realize it was reverse thread and made it WAY too tight when trying to remove it.Comment
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I think this. ^Originally posted by TB123 View Post
When you put it back, finger-tight is all it needs.Originally posted by Andy.BComment
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I did the same, until I finally was so pissed that I smacked that crap out of it, and finally it came loose.Comment
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