GM 10130928 Seal, Camshaft Drive Belt Upper Cover

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This procedure will require special tools available at automotive tool companies and some auto part stores. If the specialty tools, such as camshaft timing clamps, camshaft sprocket holding tool, and camshaft and intermediate shaft sprocket remover, are not available, obtain similar tools and adapt them for this application. Begin by removing the cam carrier and the Lash Adjusters from the cam carrier housing, keeping the Lash Adjusters in order for reinstallation. Turn the camshafts so the "flats" are facing up, then install the special camshaft timing clamp tool. Remove the camshaft sprocket bolts using the sprocket holding tool to hold the sprockets while loosening the bolts. Use a puller to remove the sprockets and then take out the flat ring from the sprocket bore. Next, remove the camshaft thrust plate cover and the thrust plate, followed by the timing clamp, and carefully withdraw the camshafts through the back of the cam carrier, ensuring not to damage the camshaft journals. Remove the seals from the carrier by carefully prying them out with a screwdriver, taking care not to damage the aluminum seating surface in the carrier. Inspect for damage or pitting on the camshaft lobes, check the nose of the camshaft for brinelling, and examine the camshaft journals inside the carrier for wear or damage. When installing the camshaft, exercise care to avoid damaging the seal, and coat the camshaft lobes and journals with moly-base grease or engine assembly lube prior to installation, ensuring the arrow on the thrust plate points up. Install the camshaft seal using a large socket and a hammer, or a piece of pipe if a large socket isn't available, making sure the seal enters the bore squarely and stops when the front face is at the same depth as the original seal. Finally, the remainder of the installation is the reverse of removal, and be sure to check cam timing after reassembly and before starting the engine.