Question 1

How to remove and replace the oil pan on V8 Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL?

Accepted Answer

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 filler. Remove the oil pan skid plate, if equipped. Unbolt the steering rack and allow it to hang out of the way. On 4WD vehicles, remove the front differential carrier. Remove the transmission bell housing covers from the rear of the engine block. Remove the crossmember. Remove the lower transmission-to-engine bolt(s). These bolts vary depending on the model of transmission used but all screw into the oil pan. Disconnect the wiring from the engine oil level sensor. Disconnect the wiring harness retainers from the oil pan. Disconnect the oil cooler lines from the oil pan on models with automatic transmissions. Remove all 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. Drill out the rivets securing the oil pan gasket to the oil pan and remove the old gasket. Wash out the oil pan with solvent. Thoroughly clean the mounting surfaces of the oil pan and engine block of old gasket material and sealant. 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 of the block where the front cover and the rear cover meet the engine block. The gasket tabs protrude at these points and must have sealant around them. Attach the new gasket to the pan, install the pan, and tighten the bolts finger-tight. Be sure the oil gallery passages in the pan and the gasket are aligned properly. Install all of the oil pan mounting bolts snugly. Install the lower transmission mounting bolts snugly. Tighten the oil pan bolts and the transmission bolts to the correct 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.

Question 2

How to remove and install an oil pan on 4.3L V6 Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL?

Accepted Answer

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.

Genuine Chevrolet Tahoe Oil Pan

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