GM 12599806 Pan Assembly, Oil

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To remove the oil pan, start by and unscrew the connection of the cable on the negative terminal of the battery. Lift the car properly with jackstands and drain the engine oil and the oil filter also. After that you will proceed to removing the lower control arm crossmember by pulling it out from below the oil pan using the bolts. Remove the front exhaust pipes by unbolting them from the exhaust manifold and taking them off since they will also interfere with the oil pan. Take off the starter motor and in the case of having, the transmission side covers. Remove the wiring harness bracket from the front of the oil pan and the bracket on the passengers side that secures the transmission oil cooler lines and the wiring to the starter motor. Loosen the bolt which connects the electrical connector to the oil level sensor installed on the lower side of the oil pan on the passenger compartment. Take off the transmission to oil pan bolts. If fitted with an engine oil cooler, then you need to remove the cooler lines and the adapter from the driver's side of oil pan. On models with the 4L80 - E automatic transmission, unscrew the torque converter cover bolts and on those that use the 4L60 - E automatic transmission dispense with the stud and bolt on the right side. Remove all oil pan bolts, after which the pan has to be lowered from the engine; if necessary it should be banged gently with a rubber mallet to free the gasket and check whether all the bolts are out. For the installation, one has to drill out the rivets that were holding the previous gasket in place and clean the oil pan with solvent. Remove oil pan and clean the mounting surfaces of the oil pan and engine block Using a bead of RTV sealant, treat the mating surfaces of the front and rear covers with the engine block. Operate them to engage and interface the new gasket to the pan, then fit and progressively tighten the bolts affording correct orientation of the oil gallery passages. Check the gap, being the distance of the rear face of the pan to the front face of the transmission bellhousing and if it is satisfactory then tighten the pan bolts/studs in a sequence to the torque setting. If not, secure the two lower oil pan to bell housing bolts and tighten them to lightly in order to pull the oil pan close to the bell housing. Finally, it is necessary to carry out the installation in the reverse sequence, subsequently tightening the oil pan bolts, putting the correct type and amount of oil, starting the engine and checking the damages before returning the car to the operational state.

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands, drain the engine oil, and remove the oil filter. Remove the oil pan skid plate if equipped. Remove the lower crossmember from below the oil pan. On 4WD models, remove the front differential carrier. There is an engine wiring harness at the front of the oil pan. Disconnect the harness bracket. Disconnect the front exhaust Y pipe from the engine and the exhaust system and remove it from the vehicle. Remove the starter motor. Also, remove the plastic bell housing side covers. Disconnect the transmission cooler line bracket from the side of the oil pan. Disconnect the remaining wiring harness brackets. Remove the transmission-to-engine mounting bolts. Disconnect the electrical connector from the oil level sensor if equipped. Remove the transmission-to-oil pan bolts. Remove the oil pan bolts, then lower the pan from the engine. The pan will probably stick to the engine, so strike the pan with a rubber mallet until it breaks the gasket seal. Wash out the oil pan with solvent. Thoroughly clean the mounting surfaces of the oil pan and engine block of old gasket material and sealer. Wipe the gasket surfaces clean with a rag soaked in brake system cleaner. Apply a 3/16-inch wide, one-inch long bead of ATV sealant to the corners where the front cover meets the block and at the rear where the rear main cap meets the block. Then attach the new gasket to the pan, install the pan, and tighten the bolts/studs finger-light. The alignment of the rear face of the aluminum pan to the rear of the block is important. Measure between the rear face of the pan and the front face of the transmission bell housing with feeler gauges. Clearance should ideally be flush, but up to 0.011 inches is allowable. If the clearance is OK, tighten the pan bolts/studs in sequence to the torque specifications. The remainder of installation is the reverse of removal. Add the proper type and quantity of oil, start the engine, and check for leaks before placing the vehicle back in service.

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands, drain the engine oil, and remove the oil filter. Remove the oil pan skid plate if equipped. Remove the lower crossmember from below the oil pan. On 4WD models, remove the front differential carrier. There is an engine wiring harness at the front of the oil pan. Disconnect the harness bracket. Disconnect the front exhaust Y pipe from the engine and the exhaust system and remove it from the vehicle. Remove the starter motor. Also, remove the plastic bell housing side covers. Disconnect the transmission cooler line bracket from the side of the oil pan. Disconnect the remaining wiring harness brackets. Remove the transmission-to-engine mounting bolts. Disconnect the electrical connector from the oil level sensor if equipped. Remove the transmission-to-oil pan bolts. Remove the oil pan bolts, then lower the pan from the engine. The pan will probably stick to the engine, so strike the pan with a rubber mallet until it breaks the gasket seal. Wash out the oil pan with solvent. Thoroughly clean the mounting surfaces of the oil pan and engine block of old gasket material and sealer. Wipe the gasket surfaces clean with a rag soaked in brake system cleaner. Apply a 3/16-inch wide, one-inch long bead of ATV sealant to the corners where the front cover meets the block and at the rear where the rear main cap meets the block. Then attach the new gasket to the pan, install the pan, and tighten the bolts/studs finger-light. The alignment of the rear face of the aluminum pan to the rear of the block is important. Measure between the rear face of the pan and the front face of the transmission bell housing with feeler gauges. Clearance should ideally be flush, but up to 0.011 inches is allowable. If the clearance is OK, tighten the pan bolts/studs in sequence to the torque specifications. The remainder of installation is the reverse of removal. Add the proper type and quantity of oil, start the engine, and check for leaks before placing the vehicle back in service.

Remove the transmission-to-oil pan bolts, followed by the oil pan bolts and nuts, and the oil pan reinforcements on each side. Lower the pan from the engine, striking it with a rubber mallet if necessary to break the gasket seal, and carefully slide it out to the rear, possibly turning the crankshaft slightly for clearance.

On models with automatic transmissions, you should disconnect the oil cooler lines from the oil pan.

After draining the engine oil, you should remove the oil pan skid plate if it's equipped.

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