1/2 '' ratchet 6" extension 27mm deep socket. It fits....does'nt seem like it should..... but it does. I used to think the shroud had to come off but it does'nt.
You have to lie on your back under the front of the car. You can put the socket and extension on the crank bolt first and then plug in the ratchet or you can connect the ratchet to the extension/socket and slide it into the balancer pulley sideways until it is almost to the bolt and then manipulate it the right way and then stab around until you seat the socket over the crankbolt. It works, just try it. We used to take the shroud and fan off to do this, until it was discovered that it does actually fit without removing all that stuff. The fan is a real pain to take off....when I found out that I had been taking the fan off all those times for no reason, it was embarrasing. Try it you will see. The drawback is that if you are adjusting valves it is way easier with a second person to spot for you.