GM 98073535
Oil Pan

The first step for Oil Pan replacement begins by removing inner axle housing nuts and washers that secure the bracket when a vehicle has four wheel drive (4WD). Then you should use a suitable jack to support the front drive axle. You must first lower the front drive axle after removing the differential carrier upper and lower mounting bolts and nuts. Then remove the transmission cover bolt. Ensure to remove the Oil Pan skid plate after unbolted hardware then remove the crossbar component with its associated bolts. Pump out engine oil before extracting the engine Oil Filter before securely reassembling drain plug and Oil Filter together. The right side transmission bolt plus stud and left side bottom bolt need removal for vehicles with 4l60-e automatic transmission. Drivers who have the 4l80-e automatic transmission should start by taking out the transmission converter cover bolts. First disconnect the oil level sensor electrical connector before you remove the battery cable channel bolt and slide the channel pin out from the Oil Pan tab. Detach the engine wiring harness clip and positive battery cable clip from the positive battery cable clip then remove the engine oil cooler lines along with the positive battery cable clip bolt and clip. Next remove the Oil Pan bolts and the Oil Pan itself. Remove all the Oil Pan bolts while maintaining passage cleanliness from foreign objects. Drill out any rivets which lock the Oil Pan Gasket before completely removing it with its rivets. Check the engine Oil Pan for required cleaning and inspection. To install the parts you must apply a 5 mm (0.20 inch) bead of gm p/n 12378190 sealant or its equivalent on the tabs of the front and rear cover gaskets which extend into the Oil Pan surface. Position the oil gallery passages of the Oil Pan against their counterparts in the engine block with the new gasket. Install the Oil Pan with gasket and bolts onto the engine block tightening the Oil Pan bolts after achieving initial resistance then stop. For vehicles with 4l80-e automatic transmission secure converter cover bolts initially until they achieve a tight fit but for vehicles with 4l60-e automatic transmission tighten the right side transmission bolt and stud until they are snug. Tighten the bolts on the left bottom side until they are snuggly fit before applying torque sequences beginning at 25 nm (18 ft. Lbs.) for Oil Pan and Oil Pan-to-Oil Pan front cover bolts and continuing with 12 nm (106 inch lbs.) on the Oil Pan-to-rear cover bolts and finishing at 50 nm (37 ft. Lbs.) for the bellhousing, converter cover, and transmission bolts/stud. Furnish the Oil Pan with the positive battery cable clip and bolt before tightening the bolt to 9 nm (80 inch lbs.). Afterward, attach the engine oil cooler lines along with the engine wiring harness clip and positive battery cable clip to the positive battery cable clip. Insert the channel pin into the Oil Pan tab while installing the battery cable channel bolt at 12 nm (106 inch lbs.) torque. Then connect the oil level sensor electrical connector and secure the transmission cover and bolt at 12 nm (106 inch lbs.). Reposition the crossbar before installing its bolts at 100 nm (74 ft. Lbs.) torque setting. If equipped with the Oil Pan skid plate then install its bolts at 20 nm (15 ft. Lbs.). Have a helper raise the front axle into position so you can install the differential carrier upper mounting bolt and nut loosely before tightening both the differential carrier lower mounting bolt and nut to 100 nm (75 ft. Lbs.). Proceed to install the inner axle housing washers and nuts to the bracket while tightening them to 100 nm (75 ft. Lbs.) first install new engine oil and an Oil Filter then put the jack aside before reinstalling the front drive axle.

Begin Oil Pan replacement by making sure the crankshaft balancer does not lift the engine because this can result in damage. Start by dissembling the front Differential when your vehicle has four wheel drive (4WD) and then move on to the Starter motor. Begin by removing all bolts securing the Oil Pan skid plate followed by separating the skid plate from its position. Model-specific maintenance steps for two wheel drive (2WD) models involve deleting both crossbar bolts and crossbar components. For 4wd models, do the same. Drain all engine oil before disassembling the oil level indicator along with the removal of the oil level sensor electrical connector. The engine harness clip needs detachment from the Oil Pan before removing the oil level sensor. Bolt out the battery cable channel while relocating the channel until you take away the Oil Pan bolts. Owners can save money by keeping the Oil Pan Gasket when it shows no sign of damage. During new Oil Pan installation apply gm 2346286 sealant at four locations on the front and rear sections of the crankshaft bearing caps. First install a fresh Oil Pan Gasket inside the pan groove followed by installation of the Oil Pan using its bolts. Follow bolt installation sequence to achieve initial torque of 10 nm (89 inch lbs.) then complete with final torque of 25 nm (18 ft. Lbs.). Secure the battery cable channel by installing a bolt that should reach 9 nm (80 inch lbs.) torque rating. After attaching the oil level sensor to the Oil Pan with a 20 nm (15 ft. Lbs.) torque you must install the engine harness clip and reconnect the oil level sensor electrical connector. The oil level indicator needs replacement before proceeding to refill the engine with oil. Using a torque wrench torque the crossbar bolts to 100 nm (74 ft. Lbs.) during installation for 4wd models. For 2wd models, do the same. Place the Oil Pan skid plate and tighten its bolts to 20 nm (15 ft. Lbs.) while also reinstalling the Starter motor and front Differential when required.

Install the positive battery cable clip bolt and tighten to 9 Nm (80 lb in), slide the channel pin into the oil pan tab, and install the battery cable channel bolt, tightening to 12 Nm (106 lb in).

Install the oil pan, gasket, and bolts to the engine block, tightening the oil pan bolts until snug without overtightening.

Remove the transmission bolt and stud on the right side and the bottom bolt on the left side.

Install the oil pan skid plate and its bolts, tightening them to 20 Nm (15 ft. lbs.), followed by the transmission cover bolts tightened to 12 Nm (106 inch lbs.).

Install the transmission cover bolt, tighten it to 12 Nm (106 inch lbs.), raise the front drive axle into position, and if equipped with AWD, install the differential carrier upper mounting bolt and nut until snug without tightening, followed by the lower mounting bolt and nut, tightening both to 100 Nm (75 ft. lbs.), then install the inner axle housing washers and nuts to the bracket, also tightening to 100 Nm (75 ft. lbs.). Remove the jack from the front drive axle and install new engine oil and a new oil filter.

Install the transmission converter cover bolts until snug.

Ensure the alignment of the structural oil pan is critical, and do not reuse the oil pan gasket.

Tighten the oil pan and oil pan-to-oil pan front cover bolts to 25 Nm (18 ft. lbs.), the oil pan-to-rear cover bolts to 12 Nm (106 inch lbs.), and the bellhousing, converter cover, and transmission bolts/stud to 50 Nm (37 ft. lbs.).