1.8 Miata crank bolt / sprocket problem

OK, I was taking the Manic Miata on a shakedown cruise and, well, it shook down.

It threw the blower belt and was making an awful clanging noise. I thought it was just the add-on blower drive pulley but it turns out that the whole accessory drive pulley was loose. In fact, I believe 2 of the 4 bolts broke off in the timing belt sprocket. I think it was the guy helping me (the car's PO) who put that stuff together, but it might have been me. It's irrelevant now.

2 questions:

1) What's the magic for loosening the crank bolt? There's too much driveline windup for me to get any torque on the bolt in the 60 degrees or so that I have to move the wrench (particularly with the big cheater pipe on it).

2) Is there any way to get the sprocket off without undoing the whole timing belt, with all the covers, valve cover, etc? I'm assuming no. Unfortunately, I don't see a way to get the old bolt stubs out without removing the sprocket.

Any advice or even just commiseration is appreciated. Thanks.

Impact wrench (air or electric)?

Which way does the crank pulley and bolt turn when you when you use starter motor? Looking directly at front of engine. (Not at home to check mine)

Flyin miata makes a tool for that, but depending on which bolts broke, might not help you.

I have a tool that looks like a lifesaver lollipop but because of the stubs I can only get 2 of the 4 bolts in. Plus I can't really see anything that lines up with the bolt hole in the stick part.

I guess I'll have to try the starter trick. Thanks, guys.

It's old school, but it works if you don't have correct tools. Don't crank starter, just tap it. Make sure wrench is secure against frame.

I made an aluminum crank and cam tool when I did the timing belt on my NB. Since then I have used the tool for my 1.8 NA and even the 1.3 B3 in my NA. The tool is fairly easy to make if you have some 3/32 thick aluminum laying around.

The bird painted on the tool is an obscure Portlandia reference.

edit..The bolts sticking through the tool in the second photo are for tightening and loosing the camshaft sprockets.

Breaker bar is the easy button. And you will be taking the timing belt off, effectively.

Make sure the replacement bolts are the correct length, the correct grade and properly torqued. There's at least one manual out there with in/lbs and ft/lbs mixed up on the torque. If they're too long, they'll bottom out before tightening.