Be very careful using an impact wrench to tighten that crank bolt. Those hardened cranks have been known to break on the end using an impact.

I once called about an 86 wagon listed for sale in my area to be told by the owner that the dealer had installed a new crankshaft in the engine. When I asked if the engine was a rebuild she said no just a new crankshaft, something to do with major service that included among other things a new timing belt.

Randy