Friend and I decided to put an overdrive pulley on my super-charged Mercedes. Read all the DIYs on it and thought we knew exactly what we were doing. Turns out we didn't. Ran great (extra 3 lbs. of boost) for about 200 miles and then it happened. We had pushed the woodruff key out of the slot and the pulley spun, sheared the key and drove it into the timing chain. Pulley grenaded and took out a bunch of other stuff, too. $2600 fix.
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