OEM Chevrolet Silverado 3500 Classic Oil Pan

Chevrolet Silverado 3500 Classic Oil Pan Parts Questions & Experts Answers

• Oil Pan
  12599806
  Q: How to replace the oil pan on Chevrolet Silverado 3500 Classic?

  A: First, in the case vehicles are equipped with 4wheel drive (4WD), the inner axle housing nuts and washers are to be removed from the bracket and the front drive axle is to be supported with a suitable jack before making any replacement. The next step is to remove differential carrier lower and upper mounting bolts and nuts, lower front drive axle, and the transmission cover bolt. If necessary, remove the Oil Pan skid plate by removing its bolts, then crossbar bolts and crossbar itself. Take off bolt and cover transmission, drain the engine oil and take off the engine Oil Filter, and put the Drain Plug and Oil Filter back on until tight. For the vehicles with the 4 l60-e automatic transmission, pull out transmission bolt and stud on the right hand side, as well as the lower bolt on the left hand side. When you have the 4l80-e automatic transmission, unfasten the transmission converter cover bolts. Disconnect the oil level sensor e / c connector, remove the battery cable channel bolt, and pull out the channel pin from the Oil Pan tab; disconnect the engine wiring harness clip and the positive battery cable clip from the positive battery cable clip, remove the engine oil cooler lines, and the positive battery cable clip bolt and clip out. Remove the Oil Pan bolts and the Oil Pan itself, making sure to avoid foreign objects falling into the oil passages. Drill out the Oil Pan Gasket retaining rivets if necessary and discard the gasket and rivets. Clean and inspect engine Oil Pan where necessary. At the time of installation, it is necessary to apply a 5 mm (0.2 inch) bead of a sealant 20 mm (0.8 inch) long to the engine block on tabs of a front and rear cover gaskets that extend into the Oil Pan surface. Ensure that the oil gallery passages in the Oil Pan are properly aligned with the engine block using the new gasket of the Oil Pan, pre-assemble the gasket to the pan and load the Oil Pan, gasket, and bolts to the block. Secure Oil Pan bolts so that they are snug but not over tightened, then install transmission converter cover bolts so that they are snug for the 4l80-e automatic transmission, and the transmission bolt and stud at the right side for the 4l60-e automatic transmission. Use the bottom bolt on the left-hand side till it's locked in place, then tighten the Oil Pan and Oil Pan-to-Oil Pan front cover bolts to 25 nm (18 ft. Lbs) and 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.). Mount the positive battery cable clip onto the Oil Pan and tighten bolt to 9 nm (80 inch lbs.) and attach engine oil cooler lines to the positive battery cable clip, engine wiring harness clip, and the positive battery cable clip. Insert slide the channel pin in the Oil Pan tab, install the battery cable channel bolt and tighten it in 12 nm (106 inch lbs). Connect the oil level sensor electrical connector, install and bolt the transmission cover, after bolting it to a 12 nm (106 inch lbs), the remaining bolt to install is the crossbar and the bolt shall be tightened to 100 nm (74 ft. Lbs.). If necessary, install the Oil Pan skid plate and its bolts at 20 nm (15 ft. Lbs.), and then the transmission cover bolts at 12 nm (106 inch lbs.). Lift the front drive axle into position and this is for 4wd, install the differential carrier upper mounting bolt and nut that are going to be tight until snug, then install the lower mounting bolt and nut and tighten to 100 nm (75 ft. Lbs). Finally, install the inner axle housing washers and nuts to the bracket, tighten nuts to 100 nm (75 ft. Lbs.), remove the jack from the front drive axle, and new engine oil and a new Oil Filter.