GM 94845385 SPROCKET, Engine Camshaft

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This is where the following procedure is followed starting from the third step right up to the eleventh ,but the tenth step is excluded. On pre-1974 small-block VB models, first temporarily unbolt and on some models remove the oil pan. First, you have to take out the fan belt, the fan, as well as the pulley, then the fan shroud. And if the camshaft is to be removed, work on the radiator is compulsory as well to be done. Then unbolt the accessory drive pulley and then go on and un-bolt the torsional damper retaining bolt. With a suitable puller, unscrew the torsional damper, it is very important to note that only a puller that pulls on the hub of the damper is allowed. Go on and take out the water pump. In small-block VS fasten the crankcase front cover plate according to the instructions and then loosen the bolts and disconnect the cover. For big-block VS, unscrew the front cover bolts to loosen the front cover so that you can strip the attaching screws and then using your hands pull the cover slightly forward in order to sever the oil pan front seal so that it is right up against the block at both the left and the right ends, following this, you can then fully remove the front cover. Tighten the crankshaft until the camshaft and the crankshaft sprockets are aligned and then unbolt the three camshaft sprocket bolts. With the soft-faced mallet, tap off the camshaft sprocket, and with your fingers, take off the timing chain. If required the crankshaft sprocket can be removed using a puller so chosen that is suitable for the application. If the engine is installed, remove both of the front mount through bolts and the right engine stand, then lower the engine on the frame. Pry out the two centre bolts and the one lower bolt which holds the hood catch support to the grille and radiator support in order to have room for the removal of camshaft. If it has not been done earlier, extract the fuel pump and also the pushrod present in the car. While doing this, care should be taken to avoid any form of impact or rough handling of the camshaft journals and cam peaks and when withdrawing this camshaft, it should be pulled out slowly, and supported in two different points in order to ensure that the cam lobes and the distributor gear do not cut or groove the camshaft bearings which are available in the camshaft block. This can be done through the installment of two, 5/16 inch - 18 x 4 inch bolts through the sprocket flange holes then tighten them in equal intervals to create a motion of the camshaft.

When fitting a new camshaft or valve lifters, coat the cam lobes with camshaft installation lubricant. Begin by installing two 5/16 inch - 18 x 4 inch bolts in the camshaft bolt holes and lubricate the journals with engine oil. Carefully install the camshaft, ensuring the journals and cam lobes feed through the bearings to avoid damage, then remove the bolts once the camshaft is fully seated. Place the timing chain on the camshaft sprocket, aligning the marks on both the camshaft and crankshaft sprockets, and connect the chain to the crankshaft sprocket while aligning the camshaft dowel with the dowel hole in the sprocket before installing it. Draw the sprocket onto the camshaft using the attaching bolts without driving it on to prevent loosening the rear plug, then torque tighten the bolts. Lubricate the timing chain with engine oil. If not already done, pry out the old seal from the front of the front cover with a screwdriver, clean the seal housing, and install a new seal with the open end facing inside the cover, pressing it in carefully to avoid damaging the seal lips. Smear the front cover oil seal lips with engine oil. For small-block VB, ensure the block and crankcase front cover are clean, remove any protruding oil pan gasket material with a sharp knife, and apply a 1/8 inch bead of RTV sealant at the oil pan and block joint as well as the front lip of the oil pan. Coat the cover gasket with a non-setting sealant, position it on the cover, and loosely install the cover, starting with the top four bolts and then two 11 inch - 20 x 1/2 inch screws at the lower cover holes. Apply RTV sealant on the bottom of the cover, install it, and tighten the screws alternately and evenly while aligning the dowel pins. Remove the two 1/4 inch - 20 x 1/2 inch screws and install the remaining cover screws. For big-block VB, ensure the block and crankcase front cover are clean, cut the tabs from the new oil pan front seal, and install the seal to the front cover, pressing the tips into the holes. Coat the gasket with a non-setting sealant, position it on the cover, and apply a 1/8 inch bead of RTV sealant at the oil pan and block joint before installing and torque tightening the cover attaching screws. Install the fuel pump pushrod and the pump, followed by the water pump. Coat the front cover seal area of the torsional damper with engine oil, place the damper in position, and use a damper installer or a suitable bolt and spacers to draw the damper into position, then install and torque tighten the damper retaining bolt, taking care not to damage the damper. Finally, install the accessory drive pulley, fan shroud (and radiator if applicable), fan pulley, fan, and fan belt, adjusting the fan belt tension as needed.