Mopar 4663745AC Pump-Engine Oil

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The oil pump is an integral component of the balance shaft module and cannot be removed or disassembled from it; if there is a problem with the oil pump, the entire balance shaft module must be replaced. To begin removal, relieve the fuel system pressure and disconnect the negative battery cable from the remote ground terminal or battery. Rotate the engine to Top Dead Center for the #1 cylinder on the compression stroke. Loosen the lug nuts on the right front wheel, raise the vehicle, and support it securely on jackstands. Remove the right front wheel, splash shield, and inner fender shield, followed by the valve cover and oil pan. Next, remove the timing chain cover, timing chain, and crankshaft sprocket. Align the drive chain plated links with the timing marks on the crankshaft sprocket and the Balance Shaft Module drive gear; if the marks cannot be found, mark the oil pump/Balance Shaft Module drive chain to the BSM drive sprocket and crankshaft gear for proper installation. Press the oil pump/BSM tensioner piston back into the tensioner body, retaining it in the locked position with a special tool or a 3 mm drill bit. Do not remove the oil pump/BSM drive sprocket. Remove the BSM mounting bolts in reverse order of tightening, lowering the rear of the balance shaft module, removing the timing chain from the sprocket, and then the BSM itself. Remove the chain from the crankshaft sprocket. If necessary, replace the crankshaft front seal within the oil pump body. Two different lengths of mounting bolts can be used on the BSM: 180 mm and 185 mm; discard the 180 mm bolts and replace them with new ones, measuring the BSM mounting bolts and replacing as needed. Check the threads of each 185 mm mounting bolt with a straightedge or ruler; if there is a gap, replace the bolts and apply clean engine oil to the threads before installation. Clean the bolt holes for the BSM mounting bolts, then place the timing chain over the crankshaft sprocket, aligning the plated link with the timing mark or previously made marks. Lift the BSM and place the drive sprocket into the timing chain, aligning the plated link with the timing mark on the drive gear. While holding the BSM in place, insert the mounting bolts and tighten by hand in several even stages, then tighten the bolts in the recommended sequence to the specified torque. The final step requires tightening the bolts a specific number of degrees; an angle-torque gauge is recommended for this procedure. After tightening, remove the pin from the tensioner and release the piston, verifying that the timing marks are aligned. Install the timing chain and timing cover, followed by the oil pan and valve cover. The remainder of the installation follows the reverse order of removal. Finally, install a new oil filter and engine oil, start the engine, check for oil pressure and leaks, and recheck the engine oil level.

The oil pump is an integral component of the balance shaft module and cannot be removed or disassembled from it; if there is a problem with the oil pump, the entire balance shaft module must be replaced. To begin removal, relieve the fuel system pressure and disconnect the negative battery cable from the remote ground terminal or battery. Rotate the engine to Top Dead Center for the #1 cylinder on the compression stroke. Loosen the lug nuts on the right front wheel, raise the vehicle, and support it securely on jackstands. Remove the right front wheel, splash shield, and inner fender shield, followed by the valve cover and oil pan. Next, remove the timing chain cover, timing chain, and crankshaft sprocket. Align the drive chain plated links with the timing marks on the crankshaft sprocket and the Balance Shaft Module drive gear; if the marks cannot be found, mark the oil pump/Balance Shaft Module drive chain to the BSM drive sprocket and crankshaft gear for proper installation. Press the oil pump/BSM tensioner piston back into the tensioner body, retaining it in the locked position with a special tool or a 3 mm drill bit. Do not remove the oil pump/BSM drive sprocket. Remove the BSM mounting bolts in reverse order of tightening, lowering the rear of the balance shaft module, removing the timing chain from the sprocket, and then the BSM itself. Remove the chain from the crankshaft sprocket. If necessary, replace the crankshaft front seal within the oil pump body. Two different lengths of mounting bolts can be used on the BSM: 180 mm and 185 mm; discard the 180 mm bolts and replace them with new ones, measuring the BSM mounting bolts and replacing as needed. Check the threads of each 185 mm mounting bolt with a straightedge or ruler; if there is a gap, replace the bolts and apply clean engine oil to the threads before installation. Clean the bolt holes for the BSM mounting bolts, then place the timing chain over the crankshaft sprocket, aligning the plated link with the timing mark or previously made marks. Lift the BSM and place the drive sprocket into the timing chain, aligning the plated link with the timing mark on the drive gear. While holding the BSM in place, insert the mounting bolts and tighten by hand in several even stages, then tighten the bolts in the recommended sequence to the specified torque. The final step requires tightening the bolts a specific number of degrees; an angle-torque gauge is recommended for this procedure. After tightening, remove the pin from the tensioner and release the piston, verifying that the timing marks are aligned. Install the timing chain and timing cover, followed by the oil pan and valve cover. The remainder of the installation follows the reverse order of removal. Finally, install a new oil filter and engine oil, start the engine, check for oil pressure and leaks, and recheck the engine oil level.

To remove the oil pump, first remove the bolt from the pick-up tube assembly and lower it away from the oil pump. Then, remove the oil pump mounting bolts and detach the pump from the engine block.

Install the pump cover and tighten the bolts to the torque.

The replacement oil pumps may experience oil pressure problems due to a collapsing oil pressure relief valve and spring.

It is advisable to consult with a dealer parts department or a qualified automotive repair facility for the correct oil pump.

Insert the outer rotor into the oil pump housing, hold it against one side, and measure the clearance at the opposite side.

Prime the pump by packing it with petroleum jelly.

A feeler gauge and a micrometer or dial caliper are needed to check the clearance of various oil pump components, including cover flatness, outer rotor diameter and thickness, inner rotor thickness, and various clearances.

To install the oil pump, position it on the engine and ensure that the pump rotor is aligned with the crankshaft drive. Then, install the oil pump mounting bolts and tighten them to the specified torque. Install a new O-ring onto the oil pump pick-up tube, connect the tube to the pump, and tighten the bolt to the specified torque. The remainder of the installation is the reverse of removal.

Insert the outer rotor into the oil pump housing, hold it against one side, and measure the clearance at the opposite side.

Remove the Allen wrench to allow the tensioner to release, then take off the spring from the dowel pin and slide the tensioner from the oil pump.

Make reference marks on the chain and oil pump gear, hold the gear to prevent movement, and remove the T45 Torx mounting bolt and the gear.

Unbolt the cover from the back of the oil pump housing and remove the inner and outer rotors from the oil pump body, noting their installed direction for reassembly.