I started tearing apart my 4bt & got stuck on the crank pulley. It's so tight I'm afraid the bolts will break off & got to wondering if they may be left hand thread. Are they left hand? Anybody have any other disassembly tips? Are the lifters like a flat tappet gas engine & have to stay with the same cam lobe?Any timing marks to pay attention to? Any hidden head bolts? This is my 1st diesel & don't want to over look anything that will make this project cost more money.Thanks for any help. Curtis