Details of the lower part of a 4-cylinder engine
1. Crankshaft sprocket; 2. Front cover (oil pump housing); 3. Rear seal housing; 4. Back cover; 5. Oil pan; 6. Oil intake pipe and filter; 7. Block caps of main bearings; 8. Connecting rod cap; 9. Lower connecting rod bearing; 10. Main bearing cap; 11. Lower main bearing shell; 12. Crankshaft; 13. Upper main bearing shell; 14. Thrust bearing half rings; 15. Oil jet; 16. Upper connecting rod bearing; 17. Piston rings; 18. Piston pin circlips; 19. Piston pin; 20. Piston; 21. Connecting rod; 22. Cylinder block
Fix the engine on a special stand, or on the floor.
Make sure you have all the necessary tools.
If you are going to completely sort out the engine, you need to disassemble it and get all the internal parts.