GMC 89060406 Engine Crankshaft FLYWHEEL

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To remove the driveplate, first raise the vehicle and support it securely on jackstands, then take out the transmission. Mark the relationship between the driveplate and the crankshaft with a marking pen, and remove the bolts securing the driveplate to the crankshaft. If the crankshaft turns, use a screwdriver to jam the driveplate or flywheel. Carefully take off the driveplate, wearing gloves to protect your fingers from the sharp edges of the ring gear teeth. Clean the driveplate to eliminate grease and oil, inspecting it for cracks and checking for any damaged ring gear teeth, laying it on a flat surface to check for warpage. Clean and inspect the mating surfaces of the driveplate and crankshaft, replacing the rear main oil seal if it is leaking before reinstalling the driveplate. For installation, position the driveplate against the crankshaft, aligning the previously made marks, and ensure correct installation with any alignment dowels or staggered bolt holes. Apply thread-locking compound to the bolt threads and place the retaining ring if equipped. Use only new bolts and wedge a screwdriver through the ring gear teeth to prevent the driveplate from turning while tightening the bolts in a criss-cross pattern to the specified torque. If the front pump seal or O-ring in the automatic transmission is leaking, replace it at this time. The rest of the installation follows the reverse order of removal.

The torque specifications should be used as per the standard guidelines.

Tightening the bolts will force the spacer off the crankshaft.

Apply thread-locking compound to the bolt threads and place the retaining ring if equipped.