#1. 2.4 LITER. Water pump assy bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Water Pump Housing to it's Mounting point. Engine Crankshaft Main Bearing Cap Bolt. Engine Water Pump Bolt. Flange. Crankshaft Main Bearing Cap. Housing. Manifold. Pulley. Thermostat outlt.