Help! with crankshaft pulley nut

[trunnell@mindspring.com (Glenn Trunnell)]

Hi,

Due to a knocking rod bearing in my Spit I'm trying to get my spare motor
rebuilt over the next couple of weeks, I cannot get the #$%^& nut off the
end of the crankshaft though!  Is this nut reverse threaded by any chance?
There is no locking tab and I have tried and broken two tools so far trying
to remove this thing, I don't have an impact wrench, is that the only way?
Why in the hell is this thing so tight?  Any advice will be greatly
appreciated!

Thanks,
Glenn