This engine rebuild kit is designed for N40, N42, and N46 2.0L inline-4 naturally aspirated engines.It includes a crankshaft, connecting rods, piston and ring set, main and rod bearings, and a gasket kit.Compatible with models including 116i, 120i, 316i, 316ci, 316ti, 318ci, 318ti, and 320i, and fits chassis codes E81, E82, E83, E85, E87, E88, E46, E90, E91, E92, E93, E60, E61, and E84. Piston & ring set OE reference numbers: 11257562457, 11257541469, 11257556435 Crankshaft OE reference numbers: 11217516040, 11210142288, 11210142287, 11217516424, 11210390923 Connecting rod OE reference numbers: 11247589533, 11247536190, 11247516426 Main and rod bearing OE reference numbers: 11217627037, 11217627038, 11217627039, 11218605856, 11218605857, 11218605858, 11217580991, 11217580992, 11217581007, 11217581008, 11217581009, 11247536774, 11247536777, 11247552063, 11247552064, 11247576717, 11247576718 Specifications: Wrist pin diameter Φ20 mm; connecting rod length 197 mm; cylinder bore Φ84.00 mm; ring thickness: first ring 1.2 mm, second ring 1.5 mm, oil control ring 2.0 mm.All components are standard specification (STD 0.00) and intended for use without cylinder bore expansion. Package includes: 1 crankshaft, 4 connecting rods, 1 piston and ring set, 1 main and rod bearing set.