Jeep 5038339AE Crankshaft

Crankshaft may be removed only after the engine has been pulled out of the car provided that other accessories including the drive plate, crankshaft pulley, timing chain/belt, oil pan, oil pump, oil filter as well as piston/connecting rod assemblies have been withdrawn. Before the crankshaft removal, clean, and place an initial dial reading on the dial indicator touching the crankshaft. Wedge the crankshaft to the rear to obtain zero on the indicator and then wedge the crankshaft to the front to read the difference; ideal measure of end-float is about 0.003- 0.010 of an inch. In case you do not have the dial indicator consider using feeler gauges to measure the clearance. Tighten the main bearing cap bolts gradually, lightly knock the caps with a light hammer gently and then remove the main bearing cap bolts including caps. Take out the crankshaft as it is rather heavy, it is best to do it in pairs, and replace the main bearing cap assembly with the arrow pointing in front. For installation, then it is required to clean the engine block and the crankshaft and examine it before fixing it. Turn the block over; also, remove the main bearing cap assembly and clean the bearing surfaces. Fit new upper and lower main bearing inserts and check that the oil holes are also in position. Measure the main bearing oil clearance with the Plastigage and adjust to the rang of 0.0015 to 0.0023 inch. If clearance is incorrect, check cleanliness to be further confident and in case there is a need, check on the bearings sizes. Once the Plastigage has been removed clean the bearing surfaces and the thrust faces and apply a coat of grease on them then fit the crankshaft and bearing caps and tighten the bolts to the recommended torque. Recheck crankshaft end play and ensure you turn the crankshaft with an appreciable amount of friction. Last but not least, I then fitted the new rear main oil seal.

The crankshaft can only be removed if the engine has been pulled out of the vehicle; again, providing that the driveplate, crankshaft pulley, timing chain, oil pan, oil pump, oil filter, and piston/connecting rod assemblies have been removed. Before removal crank shaft endplay can be measured with a dial indicator pointing with the crankshaft on the plane of the crankshaft pulley. Place the face of a dial indicator against the crank, pry the crankshaft to the rear until zero is shown on the dial indicator and then pry the crankshaft to the front and read the number which should normally stand between 0.003 to 0.010 inch. Grooving is often caused by two faces not parallel to within .002 of each other and or the surfaces of the thrust washer/by bearing assembly face are worn. In case of absence of dial indicator, the amount of clearance can be measured with the help of feeler gauges. Turn the main bearing cap/bedplate bolts at least a few turns so that they can be removed by hand; then injecting some soft face hammer lightly on the main bearing cap/bedplate and lifting it from the cylinder block must be done carefully not to Damage the bearing inserts. Convey the crankshaft out of the engine, and it is advisable to do it with assistance because of the weight. Some of the critical pieces of advice that the manufacturer gives include the following Replace the main bearing cap assembly back on the engine block and put it in its proper place. For installation, it is imperative to make sure that the engine block and the crankshaft must be clean ad checked. Place the block with the bottom turned up, unscrew the main bearing cap assembly and clean the bearing faces. New upper main bearing inserts should be fitted and aligned with the oil holes; the lower ones are also put in the main bearing cap. Inspect the main bearing oil clearance with Plastigage and see to it that it conforms to the standard measurement. If the clearance is incorrect ensure there was no debris when taking the figures and if the band is very worn the bearing inserts may have to be replaced. Before finally laying the crankshaft back in position, it is important to remove all the Plastigage deposits and apply a coat of light grade of grease or engine assembly lube to the bearing surfaces as well as the thrust faces. In case of the thrust washers, they need to be fitted properly and to the bedplate sealing area one needs to apply the RTV sealant after the main bearing cap or in case of a bedplate, one needs to fit on the crankshaft and over the cylinder block. Torque the bolts in the sequence in their corresponding tightening values then recheck crankshaft end play. Swipe the crankshaft around for a little while to feel if they protest in an attempt to turn, if yes reject them. Last but not the least, fit in the new rear main oil seal.

The elimination of the crankshaft requires that the engine be pulled out on the vehicle. Before taking the crankshaft away, it is measured using a dial indicator or feeler gauges to find out about endplay. Therefore, one should gently tap assembly with a soft-face hammer to release it from cylinder block as well as loosen main bearing cap/bedplate bolts. At this stage, another person assists in lifting crankshaft from engine very carefully. During installation, this engine block is placed bottom side up and main bearing cap assembly is removed. In addition, original bearing inserts are taken out and surfaces cleaned. Further still, new upper main bearing inserts are put in all main bearing saddles ensuring oil holes are properly lined up inside them; thrust washers are situated in right journal while lower main bearing inserts fitted into main bearing cap. Then clean faces of blocks with the journal rings and crankpin journals for bearings installations. Afterward, lay crankshaft into its position within cylinder block and verify clearance between it and other parts by using Plastigage method. The following step is putting the main bearing cap assembly onto both crankshaft's one end and cylinder block then fastening nuts appropriately. Now, remove plastigauge and scrape off any burs from contact surface of bearings If necessary lift out piston shaft from inside cylinder through these square windows which enables positioning thin film lubricating fluid on each one of bearings against rotating shaft in its place again similar manner as previously mentioned above before having returned said part back into said surrounding machined aperture there being also supplied with subsequent removal lubricated afterwards cleaning annealed metal surfaces by means again given next words since therefore towards after before although yet because so if otherwise however except along beside etc.; The main bearing cap or bedplate is installed onto the crankshaft and cylinder block, and the bolts are tightened to the specified torque. Re-measure crankshaft endplay and turn it over by hand to ensure that it moves freely. Finally, insert the rear main oil seal.

The elimination of the crankshaft requires that the engine be pulled out on the vehicle. Before taking the crankshaft away, it is measured using a dial indicator or feeler gauges to find out about endplay. Therefore, one should gently tap assembly with a soft-face hammer to release it from cylinder block as well as loosen main bearing cap/bedplate bolts. At this stage, another person assists in lifting crankshaft from engine very carefully. During installation, this engine block is placed bottom side up and main bearing cap assembly is removed. In addition, original bearing inserts are taken out and surfaces cleaned. Further still, new upper main bearing inserts are put in all main bearing saddles ensuring oil holes are properly lined up inside them; thrust washers are situated in right journal while lower main bearing inserts fitted into main bearing cap. Then clean faces of blocks with the journal rings and crankpin journals for bearings installations. Afterward, lay crankshaft into its position within cylinder block and verify clearance between it and other parts by using Plastigage method. The following step is putting the main bearing cap assembly onto both crankshaft's one end and cylinder block then fastening nuts appropriately. Now, remove plastigauge and scrape off any burs from contact surface of bearings If necessary lift out piston shaft from inside cylinder through these square windows which enables positioning thin film lubricating fluid on each one of bearings against rotating shaft in its place again similar manner as previously mentioned above before having returned said part back into said surrounding machined aperture there being also supplied with subsequent removal lubricated afterwards cleaning annealed metal surfaces by means again given next words since therefore towards after before although yet because so if otherwise however except along beside etc.; The main bearing cap or bedplate is installed onto the crankshaft and cylinder block, and the bolts are tightened to the specified torque. Re-measure crankshaft endplay and turn it over by hand to ensure that it moves freely. Finally, insert the rear main oil seal.