Trying to take apart my bmw n51 motor for fun and not trying to rebuild it becuase it toast. Took evetthing atchatchet to block off and finaly got the cylinder head off. The big end bearing is exposed on the pistons on the bottom of the block, i see the bolts that are on the bearings and bolts sorounding the pistons but i dont understand how i will get each one free from block. Any help?
I am confused by your description of the internals.
However, if this is a “normal” engine then the connecting rod for the piston is fixed to the crankshaft with the big end and cap . Remove the cap and the push the piston out the top of the block.
There were some engines where the pistons came out the bottom of the block but engines are built smaller now so that is hardly likely.