GMC 12554259 Pan,Oil

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In order to remove and install the oil pan, the procedure is different for each model year as well as the drivetrain. To start with 1994 and 1995 4WD models, you should disconnect negative battery cable and drain oil. Starter motor needs to be removed as well as two engine-to-bellhousing braces and lower part of bellhousing cover. Exhaust pipes must be separated from the manifolds. Oil pan mounting bolts/nuts are removed carefully noting location of studs and brackets. Slowly separate pan from block without prying so as not to damage sealing surfaces. Sealing surface distortion on oil pan flange can also be checked if any. New gasket is attached to pan with RTV sealant applied after cleaning gasket surfaces and carefully positioning it against block. Bolts/nuts are tightened in three steps starting at center and following a spiral pattern outwards. Engine removal may be needed for 2WD models (especially those with cast-aluminum oil pans) while 4WD models can use raised engine, which could mean that they will need to remove the engine first before accessing it fully in case there is a cast-aluminum oil pan involved. After removing bolts separate the pan carefully without using a pry tool, clean gasket surfaces, apply RTV sealant. Aligning the pan properly with the block, checking clearances when necessary then tightening of the bolts/studs holding it down in sequence. Complete remaining steps in reverse order; start engine; check for leakages at the pan before engaging gear.

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.

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.