Thanks Gadge
It's probably about 5 mm out at the extreme. So I reckon the sump will come off. As to straightening: sledge hammer, long bar, B&S device, lathe?
Well, that's about at the limit of 'straightenability', I'd say.
I would not recommend any of the 'hammer' methods which are mentioned at various sites around the Web, due to the potential to damage the shaft, and the crankcase if used with the crank still in the engine.
There are 'crankshaft straightener' tools on the market, which are a jig that bolts up to the engine, and uses jacking screws acting against a protective sleeve to apply force to bend the shaft back.
Like
THIS one. Which also has a runout indicator that can be seen in the pic. Not worth buying one for a single job, though.
For a one-off, use of a press, a set of V blocks, and a dial indicator and base to measure runout [and locate the 'high spot' of the bend], would be the best way to do it. This is with the crank out of the engine.
One other thing; be sure to check the flywheel key - it's quite likely to be at least partly sheared. If it is, replace it with a new Briggs one - don't use a steel key.
