Sd240 help

I have an sd240 engine that I'm trying to free up. What size nut is on the crank sprocket to try and turnthe engine over?

1-5/8" socket

Tyvm

OK, I'll bite.........what does "Tyvm" translate into ?

Thank you very much!!!!

Ooohhhh !
Well, I guess you can figure out about how OLD I am.............Those of us born in the last century often suffer from don'thaveaclueitus, when it comes to
the lingo in normal use among today's younger set. Forgive me-----------I'll just stay out of the way from now on, if there's letter combinations that don't
click with this old brain !

Hey all good have to learn sometime!!!