What's the best way to keep it from spinning on the D2? Sticking a screw driver in the flywheel gives me chills......Thanks guys

 

I used a half inch air gun. I found a setting that I liked based on torquing a bolt to around 200lbs outside the car, then torqued the pulley on the car.

I didnt have to hold anything.

 

If the oil pan is off, the old 2x4 up on the crank works to tighten it or loosen it.

 

There is also a tool that holds flywheels, and it works much better than a screwdriver.
+1 on a wood block if the oil pan is off.

 

Wood block in the crank web works well as suggested. I don't recommend trying to hold the flywheel

I caved and bought the official tool

 

Thanks guys. Oil pan is off. Let ya'll know how it goes

 

I don't know what torque spec you're trying to achieve on these engines but you're better off holding it at the snout, I presume this is what the official tool does. Locking the flywheel is a good way to immobilize the engine for other reasons but not for torquing the crank pulley, especially if you're using an impact gun. By holding the crank at the back you're transmitting all that force through the entire crank, gives me chills just the think about it! The closer you can get to where the action is, the better for the crank itself.

 

200' lbs
Which is why a wood block between the crank and engine block(oil pan off) works perfectly.
I always use a torque wrench too, I'm not trusting an impact. I have seen crank pulley bolts come loose for that reason.

 

I will admit I have used a gun in the past however a torque wrench is a much better bet. The BMW M5 engines go to 325 ft/lbs so it takes a good sized torque wrench, but it's worth the piece of mind. On a stand is also a little easier than in situ, and the block of wood really helps there.

 

Well of course a torque wrench is "perfect" for knowing but dont limit yourself to thinking theres only 1 way to achieve an outcome.

Locking the flywheel with a prybar, using the old serpentine with a prybar, installing the belt and locking other pulleys.