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Just replaced fan clutch on an M42 and I used a Craftsman 32mm combo wrench that I bought. Wasn't too wide, but there is obviously more room in there with the M42. I looked locally for the bike tool/BMW-specific tool to rent and couldn't find anything. I also rented a kit from either Advance or Autozone, which I thought was the pulley holder, but turned out to be only wrenches. Anyway, the nut came loose using only the 32mm wrench with 1 or 2 taps from a hammer. No soaking, no torching. I ended up just returning the Craftsman wrench afterwards. Hopefully yours comes loose as easily.
How did you hold the pulley? Was the drive belt on? Mine committed suicide with the fan when the water pump tanked, so I'm going to try a large screw driver wedged in the pulley. Otherwise it just spins
??? It just rotates, there's basically no resistance. I can't get an impact effect.
Anyway, I was really looking for the 32mm wrench. They're pretty expensive and I will only need it this once (going fdm, spal fan). I've been trying a larger adjustable wrench and also a pair of locking pliers, but neither are long or narrow enough to orient vertically
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