I have a 3L turbo diesel Holden rodeo, and I just finished rebuilding it, is it normal for a rebuilt engine to crank so long, and no, I have started it before, so it's not because it doesn't have fuel. It only happens when I first start it, within a few hours of starting for the first time that day, it will start right up. but it will crank forever once it has cooled down.
thanks
Model year? 
The OP’s vehicle is a rebadged Isuzu diesel pickup - https://en.wikipedia.org/wiki/Holden_Rodeo
Its a 2003 holden rodeo ra tfs77 manual 450000 km, ob2 ports not working
@InThrustWeTrust
No that's not normal generally that means you have a problem with the cold start system. have the glow plug system checked first
Thanks, i'll check it, but i don't think i would need a cold start system when the ambient temp is 25 degrees Celsius anyway?