Changed the harmonic balancer tried to crank the car,

What is this



heard noises loosened the oil pan and

Appears to be your main bearing caps? I have no idea

How did you install the new balancer?

It was my first time doing it,I didn't know anything about the timing

Yikes! Expensive lesson.

Sorry to see this. Not good news at all.
I know it'* a bit too late now, but always best to consult a service manual before performing any unfamiliar mechanical work.

your timing shouldn’t be changed by replacing harmonic balancer. Your engine uses the rings to know where the crankshaft is in its rotation which means all appropriately manufactured replacements should fall very close to the Oe design. Unless you played with it, your engine wouldmt detonate from a new balancer that was remotely decent.

what else was going on when you replaced, what did you touch, did ya break wires somewhere. Was this engine high mileage and burning oil like mad etc

What they said ^^^^^^^

. . . and how did you replace the harmonic balancer?

Why did you replace it?????

did you use an impact wrench to take it off or put it on?
what kind of car?