GM 12627163 Engine Crankshaft

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The crankshaft can only be removed having removed the engine from the car if and only if other components, such as the fly wheel, crank shaft pulley, timing chain or belt, engine oil pan, balance shaft with oil pump body, oil filter, and the pistons/connecting rods with the rear main oil seal. 1. The first check to be done is the inspection and measurement of crankshaft end-play with the help of a dial indicator placed close to the crankshaft. Push the crankshaft to the rear and screw the top of the indicator until its face reads zero; push the crankshaft to the front and read its position which should range from 0.003 to 0.010 inch (0.076 to 0.254 mm). If the dial indicator is not available, it is possible to use feeler gauges to measure clearance. It is recommended to slacken the lower crankcase bolts gradually so that they can be peeled off by hands; all the center bolts in the lower crankcase should however be replaced with new ones whenever the crankcase is to be fastened again. Carefully unbolt and take out the lower crankcase without dropping bearing inserts and then lift the crankshaft ,where necessary with a little help. For installation, make sure that the engines block as well as crank shaft are clean and that they have been inspected. Place the engine block with crank; upwards, any original bearing inserts should also be removed and the bearing areas washed. Place new upper main bearing inserts on the engine block and position oil holes; place the lower main bearing inserts on the lower crankcase. By use of a clean cloth, wipe the outer faces of the crankshaft and the bearing inserts before positioning the crankshaft in place. When measuring the oil clearance of the main bearing it is advisable to use Plasti-gage and should not be interfered with while the process is going on. In case of incorrect clearance it is necessary to make sure that there was no debris during the measurement and check if the bearing inserts are worn-out and must be substituted. Upon removing of any Plastigage residue, place back the crankshaft, ensure that bearing surfaces are lubricated and finally place the lower crankcase, tighten and sequence bolts. Check the crankshaft end play again and try to turn it with little force on it. Last but not the least part is to fit the new rear main oil seal.

Once the correct clearance is achieved, the Plastigage is removed and the crankshaft is lifted out of the cylinder block.