BK2Q-6110-D1E Engine System Piston for Ford Transit V348 The BK2Q-6110-D1E Piston is designed for the 4D22 diesel engine. As a key component of the engine system, the piston moves inside the cylinder and works together with the piston rings, connecting rod and crankshaft to convert combustion pressure into mechanical power. This replacement piston is suitable for engine repair, overhaul and replacement applications. Before ordering, please verify the OE reference number,