Chrysler 4663638 CRANKSHFT

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To remove the crankshaft, the engine must be taken out of the automobile. Prior to removing the crankshaft, however, it is necessary to measure its endplay using a dial indicator or feeler gauge. The main bearing cap bolts are then unfastened and the main bearing cap assembly is gently lifted away from its position. Another person could now easily lift out the crankshaft from the engine. Cleaning and inspection of both the engine block and crankshaft precede installation. Original inserts are withdrawn whereas bearing surfaces are cleaned up on which new upper and lower main journal bearings will otherwise be installed ensuring that oil holes match accordingly. Then, lay down a crankshaft with thrust washers set on right main journal inside and check main bearing oil clearance by means of Plastigage.Such action may require replacement of different bearing inserts as maybe , Once the clearance is correct, the Plastigage is removed and the crankshaft is lifted out of the cylinder block. Clean moly-base grease or engine assembly lubricant must be applied onto bearing insert faces when they go back into place again since after that, put your crank-shaft back in cylinder block. Finally, the rear main oil seal is installed.

To remove the crankshaft, one has to tow the engine out of the car and assuming that the following components have been removed; driveplate, crankshaft pulley, timing belt or chain, oil pan, oil pump body, oil filter, oil pump pick-up tube, windage tray and connecting rod/bosses. Before removing measure the crankshaft end play by placing the dial indicator on the crankshaft as shown below. Rotate the crankshaft to the rear and set the indicator to zero then turn it to the front to read the figure, depending on the engine type it should read between 0.003 to 0.010 inch (0.076 to 0.254 mm). In case, one has no dial indicator, feeler gauges can be applied to decent clearance measurement. On 2.4L engines, you will have to remove the bolts holding the ladder frame and detach this from the engine block. It is necessary to use new cap bolts to assemble the engine and the old bolts must be used for shaft oil clearance measurement. Gradually, relieve the primary bearing cap bolts and using a soft-faced hammer tap the cap lightly and then remove the cap gently. Take out the crankshaft if possible, with help, and replace the bedplate/main bearing caps with the arrow pointing forward. It is recommended that during installation the engine block and the crankshaft must be cleaned well and inspected too. The new target wheel has to be installed on 2.4L and on 3.6L engines, using a new bolt which must be tightened in turn. The engine block has to be positioned upside down, the main bearing caps have to be removed and the bearing surfaces have to be cleaned. Set new upper main bearing inserts and make sure the oil holes are in line; fit Thrust washers in the proper journals. Remove the old piston assembly; clean the crankshaft and put it horizontally; check the main bearings oil clearance with the help of Plastigage. Place main bearing caps without removing from the Plastigage and provide proper alignment and torque settings. If the clearance turns out to be marginal with respect to the specified limits it is recommended to investigate whether the bearing is restricted by dirt or oil and decide about replacement of bearing inserts. All Plastigage should be cleaned off just prior to final assembly, and the bearing surfaces and thrust faces should be coated lightly with oil. Reinstallation of crankshaft should be done; the bearing insert faces should be cleaned and treated with oil before fixture of the main bearing caps. After that, with the bolts tightened progressively in horn sequence, check crankshaft end-play again. Revolve the Crank Shaft with your hands and feel whether the Crank Shaft is binding anywhere in its operation. For 2.4L engines use RTV sealant on the engine block base prior to positioning of the ladder frame and doing the tightening of the bolts. Last of all, it is necessary to fit the new rear main oil seal assembly and the oil pump or the pick-up tube.

The crankshaft endplay needs to be rechecked.

Remove any Plastigage residue before final installation, applying a thin layer of lubricant to the bearing surfaces and thrust faces.

The main bearing caps are installed.