I RECENTLY replaced my pushrod bearings and after reasemble motor wont turn over hits hard once then thats it

 

What are push rod bearings?

What kind of engine are we talking about, and what year.

 

its a 2000 4.0 inlinen 6

 

Hmm it doesn't start after replacing the what.....

 

the bearings on the crank going to each conectinc rod

 

That would be the crank bearings/main bearings.

That shouldn't have nothing to do with it not starting tho.Something else must of happened.

Getting fuel? What about a good spark? Timing has to be off or something.I would start with making sure its in time and has fuel and spark.That or some sensor didn't get plunged back in.

 

Would also help to know what or how you changed them.Motor taken out and apart or was it done with the motor still in or what not,The more info you give the better odds you have of getting some help.

 

If you installed the wrong size bearings with insufficient clearance the engine won't turn (too much drag). You need a minimum clearance of 0.001" on the mains and connecting rods.

Did you mic out the journals or use plastigauge to determine the proper bearing selection?

 

Yeah
There are several size bearings. Make sure you used the right ones!