... down. Each piston is connected to the crankshaft by a connecting rod. As the piston goes down, ... a balancer for the engine, reduces vibrations caused by cylinders firing, and it provides a smooth surface ... to transfer engine torque (the turning effort produced by the pressure from the crankshaft on the pistons) ... 038141025D for AUDI A3 (8L1) ,TT (8N3) ,A1 (8X1) ,VW PASSAT (3A2, 35I),BORA (1J2)