GM 12641015 Pan Assembly, Oil (Rwd)

Lifting the car and taking off the oil pan In order to take off the oil pan, you should first discharge the battery by detaching the cable from it's negative terminal. Then, next, disconnect the plenum, the intake manifold, the valve covers, and the timing chain cover. Depending on the make of the car remove the engine using a suitable engine support fixture and then remove the front subframe. Now remove the right-side engine mount bracket bolts and the bracket, then the long bolts that hold oil pan to the rear main oil seal housing-some model may be nuts on this. Undo all the remaining bolts that hold the oil pan with the timing cover and engine block apart and pry the oil pan off the engine block in areas noted above that will minimize rustled up pieces of metal. If necessary, you can remove the oil level sensor by rotating it counterclockwise until it comes loose from the oil pan, then undo the retaining bolts of the baffle and take it out also, and the oil pickup oil seal needs to be replaced also. Before installation, clean the surfaces on which the oil pan and engine block will be bolted with brake system cleaner, inspect the oil pump pickup for cracks or leakage and make sure that screen is not blocked or damaged. Replace the oil seal on the oil pickup for the pump, re-torque the bolts in the bottom of the oil pan and fit the baffle. Tap two studs of M8 x 1.25 mm bolts and thread for at least 25 mm while the nut head of the bolts are capped and place the threaded studs on the oil pan bolt holes for the alignment. Use a 1/8-inch wide groove of RTV sealant to the mated surface of the oil pan and to the corners of the timing chain cover and rear main seal housing. Place the oil pan and secure the bolts loosely; also, remove the threaded dowel pins and properly tighten the oil pan bolts with a desired torque sequence. Last of all, put the correct kind and amount of oil, taking action and turning on the engine, then inspect for leakage before returning the car to operation.

Before proceeding with the removal of the oil pan, one requires to have the air conditioning system evacuated by a professional then pull the cable of the negative terminal of the battery. Lift the vehicle properly with jackstands remove the engine oil from it and then proceed to remove the oil filter then the air filter housing and air intake resonator. Subsequently, disconnect all the wiring harness brackets which are attached near the oil pan also the brackets which secure the transmission oil cooler lines on the passenger side to be undone; finally pull the electrical connector from the oil level sensor present on the right side of the oil pan. It is not completely necessary, but remove the front exhaust pipes from the engine and the rest of the exhaust system to make the oil pan removal easier. Pull the starter motor and the two hourly plastic housings on each side of the bell housing, besides, disconnect the ac line to the compressor and cover. Place a support handle above the engine so that the engine can be lifted a little in order to carry out the removal of engine mount nuts and the mount which joins the subframe. Nuf that nu subframe, nad complete the removal of the transmission to oil pan bolts. If so fitted, undo the engine oil cooler line and the adaptor from beside the driver's side of the oil pan, and also the access plugs over the nuts at the rear of the oil pan. Last of all, take out all the oil pan bolts and drop away the oil pan from the engine, it might be required to use rubber mallet in order to break the gasket. For installation, and for removal you should also remove the gasket, and flush the oil pan with solvent and clean the oil pan gasket mating surface and the engine block mounting surface. Run a thin RTV sealant up to 0.2 inch wide along the seams of where the front and rear covers meet the engine block, put the new gasket onto the oil pan and install it and at this time tighten the bolts to finger tight while also making sure that the oil gallery passages are properly aligned. Check the fit between the rear wall of oil pan and the front wall of the trans housing, and if clear and interlocking, then slowly tighten the oil pan bolts in a star pattern till you get the torque specified for it. It is recommended to reinstall the subframe, then reverse the removal procedure, replace the oil in the engine, start the car, and assure that there are no leaks driving the car.

Tighten the oil pan-to-engine block bolts gradually in a criss-cross pattern from the center outwards to the specified torque.

The oil pickup can be removed once the bolts in the bottom of the oil pan are taken out, and the oil pickup oil seal should be discarded.