GMC 10111769 Seal Assembly, Cross Shaft Front Oil

If the engine has been removed from the car, disregard the following steps which do not apply. Begin by removing the engine drive belts for each accessory. Next, take off the right front fender inner splash shield to provide working clearance. With the parking brake applied and the shifter in "Park" (automatic) or in gear (manual) to prevent the engine from turning over, remove the crank pulley bolt, using a breaker bar if necessary due to the considerable torque. Mark the position of the pulley to the hub before removing it, then detach the bolts securing the crank pulley to the hub and lift it out. Use a crank hub puller to remove the hub from the crankshaft. Carefully pry out the oil seal from the front cover with a large screwdriver, ensuring not to distort the cover. Install the new seal with the helical lip toward the rear of the engine, driving it into place with a special tool or an appropriately sized socket, or a flat block of wood if there is enough room. Apply a light coat of oil to the inside lip of the seal. Position the pulley hub on the crankshaft and, using a slight twisting motion, slide it through the seal until it bottoms against the crankshaft gear, using the crank pulley hub bolt to press it into position. Install the crank pulley onto the hub, aligning it with the marks made during removal, then install the crank pulley hub bolt and torque it to specifications. Complete the installation by reversing the removal steps and tightening the drive belts to their proper tension.

Where a new or re-ground crankshaft is to be fitted, or the original one has been re-ground, the correct bearings must be fitted. The V6 engines require the rear main bearing oil seal to be fitted with the upper half seated on the cylinder block seat and the lower half on the rear main bearing cap with the lips turned forward. If two lips are available place the one helix forward. For the seal halves install the protector installation tool and lubricate the seal lips with fresh engine oil. Place the main bearings in the cylinder block and bolt the main bearing caps in place; apply engine assembly lube to the bearing surfaces. Be very gentle in placing the crankshaft in its corresponding location so as not to scrap the bearing surfaces off the journals. It is necessary to put a layer of brush-on sealer on the block mating surface and the related surface of the bearing cap while the crankshaft or seal should not be contacted. Place securing bolts of the main bearing caps on the crankshaft and onto the cylinder block in a manner to face an arrow on the bearing. Tighten all the main bearing cap attaching bolts to the prescribed torque, apart from the number 5 (L4) or number 3 (V6) main bearing cap which should be initially tightened to about 15-18 Nm. Gently strike the end of the crankshaft with a lead hammer if the rear bearing is not seated properly, then re-torque all bearing cap bolts to the prescribed standards. For crankshaft end play, push the crankshaft forwards and check with the feeler gauge the clearance between the front of main bearing and the crankshaft thrust surface. Last put in the rear oil seal and the flywheel to help rotate the engine during reassembly, for L4 engines place the Woodruff key into the slot in the end of the crankshaft then put in the crankshaft timing gear and be sure that the timed mark on the crankshaft and camshaft gears match.

Remove the old oil seal from the bearing cap and apply a sealer to the seal groove.

To replace the front seal, start by removing the vibration damper.

Always replace both halves of the rear main oil seal as a unit.

Remove the timing chain cover.

Ensure the correct bearings are used.

Always replace both halves of the rear main oil seal as a unit.

Drive in the new shedder using a punch, staking it in place in at least three locations.

After removing the vibration damper, carefully pry the seal out of the cover.

Begin by removing the oil pan and oil pump, followed by the rear main bearing cap from the engine.

Clean all sealant and foreign material from the cylinder bearing cap and case without using an abrasive cleaner. Inspect components for nicks, scratches, or burrs at all sealing surfaces.

Apply the new oil seal packing around the opening with the ends positioned at the top.

If the special tool is unavailable, carefully work the seal lip over the crankshaft end and tap it in with a hammer and blunt drift until properly seated.