For now I'll just cover the pistons with rod orientation.
In the picture below it shows the top of the piston. The red circle on the left is highlighting the "AW" with an arrow. That arrow is to be pointed toward the front end of the motor or stated by Bentley manual, to face the camshaft drive. The circle to the right is the piston's size, in this case 86.365mm.
The caps of the connecting rods have "C4" stamped into the top of them. On this motor those face towards the rear of the motor. Also the rod bearings have two small tabs on them and they should be on opposite ends.
When taking apart the rotating assembly, it is extremely important to match the existing parts with their current cylinder especially if you are not replace the pistons. The reason behind this is over time the parts wear in a certain pattern and the same wear may not occur in a different cylinder.
I will do other parts as they come along.
1987 325is(Midnight Tuning Tuned OBD I S52
) - Current Summer Car
2012 Hyundai Veloster Tech- Daily Driver
1985 318i - 1st Car (started it all)