#1. 2.7 LITER. PartQualifier: #1. Water pump bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Engine Coolant Outlet Housing or related components. Bolt used to fasten the Engine Intake Manifold. Engine Coolant Thermostat Housing Bolt. Engine Water Pump Bolt. Coolant Outlet. Coolant Thermostat. cover. Intake Manifold. Water Pump.