The crankshaft can only be removed after the engine has been pulled out of the car on the condition that such parts as the flywheel crankshaft pulley, timing chain cover, oil pan, oil pump body, oil filter, and
Piston/connecting rod assemblies have been stripped off. Before withdrawal make sure of the crankshaft end float by putting the dial gauge parallel to the crankshaft. Push the crankshaft to the right and then to the rear to bring the indicator to zero then push the crankshaft to the left then note down the reading which should be within the range of 0.003-0.010 inch (0.076-0.254mm). Sometimes get of clearance can be approximated if dial-indicator is not available by use of feeler gauges. Unbolt the main bearing bridge and then free up and remove the main bearing cap bolts to the point where you can do so without dropping the bearing inserts. It is recommended that you lift the crankshaft out and seeing as they are quite heavy you might have a friend help you. For installation, make sure that the engine block and the crankshaft are clean and likewise check for any signs of damages. Raise the engine block in an inverted fashion, provide no support for the crank and remove any residual support and clean up the bearing surfaces. New upper and lower main bearing inserts have to be fitted, beforehand making sure that the oil holes are in place and aligned; no lubricant shall be applied at this time. Using Plastigage to check the oil clearance and make certain that the Plastigage is installed correctly and the bolts are tighten correctly and compare the width of the crushed Plastigage as shown on the scale. If clearance is not as specified, check the fact that no debris was in evidence when the clearance was measured, and consider machining or replacing the bearing inserts in this case. If you found some Plastigage on the crankshaft, then remove it, and apply some grease or assembly lube to the bearing surfaces and lay the crankshaft back in its position. The main bearing caps should be fitted correctly and oil put on the bolts before tightening as provided for. Lastly, once more adjust the crankshaft end-float and double check it for any drag on it before fitting a new rear main oil seal.