GM 12554259 Pan,Oil

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When separating the oil pan from the block, it's essential to do so carefully without using a pry tool, especially for models with cast-aluminum oil pans.

The remainder of the installation is the reverse of removal. The engine should be reinstalled and the vehicle should be lowered.

A thin coat of RTV sealant should be applied to the ends of the rubber seal, where it fits into the main bearing cap.

To remove and install the oil pan, the procedure varies depending on the model year and drivetrain. For 1994 and 1995 4WD models, start by disconnecting the negative battery cable and draining the oil. Remove the starter motor, the two engine-to-bellhousing braces, and the lower part of the bellhousing cover. Separate the exhaust pipes from the manifolds. Remove the oil pan mounting bolts/nuts, noting the location of studs and brackets. Carefully separate the pan from the block without prying to avoid damaging sealing surfaces. Clean the gasket surfaces and check for distortion on the oil pan flange. Apply RTV sealant, attach the new gasket to the pan, and carefully position the pan against the block. Tighten the bolts/nuts in three steps, starting at the center and working outward in a spiral pattern. For 1996 and later models, especially those with cast-aluminum oil pans, engine removal may be necessary for 2WD models, while 4WD models can be done with the engine raised. After removing the bolts, separate the pan carefully without using a pry tool, clean gasket surfaces, and apply RTV sealant. Ensure proper alignment of the pan to the block, measure clearances as needed, and tighten the pan bolts/studs in sequence. Finish the remaining steps in reverse, start the engine, and check for oil leaks at the oil pan.

The remainder of the installation is the reverse of removal. The engine should be reinstalled and the vehicle should be lowered.

When working on 1994-1995 4WD models' oil pan removal, it's necessary to separate the exhaust pipes from the manifolds.

When working on 1994-1995 4WD models' oil pan removal, it's necessary to separate the exhaust pipes from the manifolds.

A 3/16-inch wide by 1/8-inch thick bead of RTV sealant should be applied around the oil pan flange and the front circle of the pan, where it contacts the timing chain cover.