Q: How to remove and reinstall an oil pump in four cylinder engine on 2006 Pontiac G6?
A: To remove the oil pump, first drain the engine oil and remove the drivebelt. Loosen the right front wheel lug nuts, raise the front of the vehicle, and support it securely on jackstands before removing the right front wheel. Next, remove the timing chain cover and, working on the rear of the timing chain cover, loosen the oil pump cover screws gradually until they are all loose, then remove the cover. For inspection, note any identification marks on the rotors and withdraw them from the pump body; if no marks are visible, use a permanent marker to create your own for correct reinstallation. Clean and dry all components thoroughly, inspecting the rotors for wear or damage; if any component is scored or damaged, the entire oil pump assembly must be replaced. If the components are acceptable, dip the rotors in clean engine oil and install them into the pump body with the identification marks aligned as noted during disassembly. Remove the oil pressure relief valve components from the oil pump body, clean and dry them, and inspect for wear or damage before reinstalling in the correct order. For installation, place the rotors into the housing with the hub of the inner rotor facing the engine front cover, ensuring correct installation for proper fastening of the engine front cover. Install the oil pump cover and screws, tightening them by hand until snug, then gradually and evenly to the specified torque. Reinstall the timing chain cover, fill the engine with fresh oil, and install a new oil filter. Start the engine and check for leaks, ensuring that oil pressure rises to normal quickly; if it does not, stop the engine immediately to investigate the cause, as running with insufficient oil pressure can cause severe engine damage.