Nissan 12200-JK21A Crankshaft Assembly

Ensure the engine block and crankshaft are clean and inspected. Position the block with the bottom facing up, remove the main bearing cap assembly, and clean the bearing surfaces. Lay the new upper main bearing inserts in the block, ensuring the oil holes align, and place the lower inserts in the main bearing cap. Do not hammer the inserts into place, and avoid applying lubrication at this stage.