Torque specs

Is there anywhere to find toque specs to help facilitate changing parts on a truck? I've had mixed luck with calling a dealer/mechanic garage and was wishing there was some kind of dedicated database where you could look up specs by part or year, make and model.

 

How do you find out the grade of a bolt? I've currently got a secondary fan belt tensioner pulley that I need to change out. Being that the mounting material is the engine itself, what torque spec would I look up for that?

 

This is pretty much me. I just look up on YouTube or whatever resource I can to see if I think it's something I can do or not and if so, set about doing it.

The current truck I'm driving I've replaced three air suspension bags, ride height leveler valve, the rear differential torque arm and have to replace the fan belt tensioning pulley, fan clutch, fan belt and engine fan solenoid from what I understand. I don't even know how the fan belt is still on with how the tensioning pulley is angled but it's been holding up so I've been letting it be but figure I should replace it before it does anything obnoxious like busting a hole in the radiator.

The previous operators didn't seem to take care of the truck, from what I'm seeing.

 

My only concern with that is I think someone over torqued a fan belt pulley on a previous truck I was driving because I replaced it and it stripped the threads a lot easier than I feel like it should have and I really don't want to have that happen again. Might have been whoever put the previous one on but that doubt will always be in my mind because of it.