GMC 15042759 Plate Assembly, Clutch Pressure & Driven (W/ Cover)

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The removal process occurs by removing the transmission, leaving the engine in place to allow access to the clutch components; meanwhile, it is important to have an engine hoist or jack and a piece of wood under it before lowering down the motor to avoid crushing the oil pump pick up through the oil pan. The oil pan was next to the pickup; thus, care must be taken. Firstly, remove the release cylinder. In case of heavy-duty (cast iron case) transmissions, remove bellhousing-to-engine bolts and probably pry off the housing from alignment dowels. It's fine if you leave clutch fork and release bearing with housing. Consequently, it is recommended to use an alignment tool for supporting clutch disc when it is removed. Care should be taken while checking flywheel and pressure plate for indexing marks or scribed marks regarding their alignment. The pressure plate should be loosened gradually in a criss-cross pattern and its bolts can be removed after which pressure plate and then clutch disc are also withdrawn. One needs to inspect all clutch components including flywheel that has a pilot bearing for defects like twisted fingers of diaphragm spring as well as worn-out driven plate assembly (clutch dic). Rivets' heads on frictional lining above 1/16 inch are checked while rivets are not allowed to move freely; besides, any distortion or cracks are examined too before that disc is replaced. Also, one needs to check release bearing as well as machined surfaces and diaphragm spring fingers on pressure plate for wear or damage whereas if needed this part should be substituted. To ensure no oil or grease remains on them, clean flywheel and pressure plate surfaces using lacquer thinner or acetone just before their installation. For proper installation, position clutch disc and pressure plate against flywheel using an alignment tool while tightening each bolt of pressure plate-to-flywheel gradually in a criss-cross pattern . Finally these bolts need tightness after aligning the disc by using this tool. Before installing a clutch release bearing, it is necessary to lubricate it with high-temperature grease in contact areas of the release lever and release bearing as well as on transmission input shaft bearing retainer. Reinstallation is done of the transmission, release cylinder and all parts that were removed initially with all fasteners tightened to the recommended torque specifications.

The clutch disc and pressure plate should be positioned against the flywheel with an alignment tool to ensure proper installation.