The document provides instructions for removing and installing various engine components on a Caterpillar 305E2 Mini Hydraulic Excavator including the inlet manifold, inlet and exhaust valves, engine oil cooler, engine oil pump, water pump, and water temperature regulator. The procedures include draining fluids, removing mounting hardware and connections, cleaning components, and installing components in the reverse order of removal while applying sealant and torquing fasteners to the specified values.