GMC 12584041 Seal, Crankshaft Front Oil

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Disconnect the cable from the negative battery terminal. Remove the drivebelt. Raise the vehicle and support it securely on jackstands. Remove the splash shield from below the engine compartment by removing the splash shield mounting bolts. Use a breaker bar and socket to remove the crankshaft pulley center bolt. A large pin spanner can be used to prevent the pulley from rotating while the bolt is loosened. Discard the bolt and obtain a new one for installation. It will be necessary to lock the pulley in position using a strap wrench or a large pin spanner. Be sure to wrap a length of old drivebelt around the pulley for a good grip if you are using a strap wrench. Slide the puller off the nose of the crankshaft. If the pulley is stuck, use a puller that bolts to the three threaded holes in the pulley hub. Additionally, a spacer, such as a deep socket that just fits into the hole in the pulley and bears on the crankshaft, will be required to avoid damage to the crankshaft. Use a seal puller to remove the Crankshaft Seal. A screwdriver may be used instead, if the tip is wrapped with tape to avoid scratching the crankshaft. Clean the seal bore and check it for nicks or gouges. Also examine the area of the hub that rides in the seal for signs of abnormal wear or scoring. For many popular engines, repair sleeves are available to restore a smooth finish to the sealing surface. Check with your auto parts store. Coat the lip of the new seal with clean engine oil and drive it into the bore with a seal driver or a socket slightly smaller in diameter than the seal. The open side of the seal faces into the engine. Using clean engine oil, lubricate the sealing surface of the hub. Install the crankshaft pulley/damper with a special installation tool, available at most auto parts stores. Do not use a hammer to install the pulley/damper. Install a new center bolt and tighten it to the torque. You must use a new pulley bolt. The remainder of the installation is the reverse of the removal procedure. Reconnect the battery.

Disconnect the cable from the negative battery terminal. Loosen the right front wheel lug nuts, raise the vehicle and support it securely on jackstands, and remove the wheel. Remove the inner fender splash shield from the passenger side of the vehicle. Remove the crankshaft pulley bolts using the pressure from the drivebelt to prevent the engine from rotating. Remove the drivebelt. Remove the timing belt cover and the timing belt. Use a pin spanner to hold the crankshaft sprocket stationary, then remove the crankshaft center bolt. Remove the crankshaft sprocket and the seal hub from the crankshaft. Use a seal puller to remove the crankshaft front seal. Clean the seal bore and check it for nicks or gouges. Also examine the area of the hub that rides in the seal for signs of abnormal wear or scoring. Coat the lip of the new seal with clean engine oil and drive it into the bore with a seal driver or a deep socket slightly smaller in diameter than the seal. The open side of the seal faces into the engine. Lubricate the seal contact surface of the crankshaft seal hub with clean engine oil. Install the crankshaft sprocket and tighten the center bolt to the specific torque. Reconnect the battery. The remainder of installation is the reverse of removal.

Disconnect the cable from the negative battery terminal. Remove the drivebelt. Raise the vehicle and support it securely on jackstands. Remove the splash shield from below the engine compartment. Use a breaker bar and socket to remove the crankshaft pulley center bolt. Slide the puller off the nose of the crankshaft. Use a seal puller to remove the crankshaft front seal. Clean the seal bore and check it for nicks or gouges. Coat the lip of the new seal with clean engine oil and drive it into the bore with a seal driver or a socket slightly smaller in diameter than the seal. Using clean engine oil, lubricate the sealing surface of the hub. Install the crankshaft pulley/damper with a special installation tool. Install a new center bolt and tighten it to the specific torque. Reconnect the battery.

The crankshaft and seal bore should be thoroughly cleaned and degreased by wiping them with a rag soaked in lacquer thinner or acetone.

A special rear main oil seal installation tool or a socket with the exact diameter of the seal can be used to drive the seal in place.

Install a new center bolt and tighten it to the specific torque.

The new seal should be carefully positioned onto the crankshaft, ensuring that the edges are not rolled over.

The new seal should be carefully positioned onto the crankshaft, ensuring that the edges are not rolled over.

A special rear main oil seal installation tool or a socket with the exact diameter of the seal can be used to drive the seal in place.