GM 12554258 Pan Assembly, Oil

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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.

If the oil pan is stuck, it can be dislodged using a block of wood and a hammer.

A scraper should be used to remove all traces of sealant from the pan and block. The mating surfaces should then be cleaned with lacquer thinner or acetone.

The oil pan mounting bolts/nuts should be removed, and it's important to note the location of studs and brackets to ensure proper reinstallation during assembly.

If the oil pan is stuck, it can be dislodged using a block of wood and a hammer.

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

After completing the oil pan installation process, clearances should be measured as needed, and the engine should be started to check for oil leaks at the oil pan.