Changing the oil pump on a 1983 Dodge 400 is not a simple procedure and should not be attempted by a novice home mechanic. The 2.2-liter engine came in both a turbo and a non-turbo version. Changing the pump on a turbo engine is slightly easier. Steps that can be safely skipped for the turbo engine will be indicated at the end of the step. Be sure to read the entire step before performing the work if your engine is turbocharged. Locate a solid, level and well-lit area to park the vehicle. Park the car, shut off the ignition and allow the vehicle to cool completely before proceeding.
Tools Used: Ratchet and sockets, Screwdrivers, Adjustable wrench, Torque wrench, Liquid gasket, Jack, Jack stands, Oil filter wrench, Drip pan, Funnel, Shop rags, Replacement oil filter, 5-quarts 10W-30 motor oil
Change the Oil Pump
Removing the Oil Pump
Locate and remove the upper timing belt cover from the engine. This Step is unnecessary for turbo engines.
Set the position of the no. 1 piston to top dead center by turning the engine over until the timing mark on the flywheel is aligned with the mark on the transaxle housing and the mark on the camshaft sprocket aligns with the mark on the cylinder head. This Step is unnecessary for turbo engines.
Disconnect the negative battery cable from the battery. Remove the oil dipstick from the engine. Disconnect and remove the distributor. This Step is unnecessary for turbo engines. Set the vehicle's parking brake.
Jack up the vehicle and place the jack stands under the car. Make sure they are located beneath the car's frame and that the legs of the jack stands are sitting level on the ground.
Place the drain pan under the oil drain plug located at the bottom of the engine on the oil pan. Remove the drain plug and allow the oil to drain until the flow comes to a complete stop.
Reinstall the drain plug into the oil pan. Remove the oil pan by removing the bolts holding it in place on the engine.
Remove the oil pump and pick-up assembly by removing the two bolts mounting it to the engine. Remove the screw on the oil pump cover and remove the oil pick-up from the oil pump. Discard the old oil in compliance with local laws.
Installing the Oil Pump
Pour fresh oil into the pump intake and turn the pump driveshaft several turns. This will prime the pump. Continue to add new oil and turn the driveshaft until oil drains out of the pumps pressure port.
Wipe the pump mounting surface on the bottom of the engine. Apply the liquid gasket to the mounting surface on the engine. Apply clean oil to the oil pump driveshaft.
Align the center slot in the pump driveshaft so that it is parallel to the engine's centerline. Slide the oil pump into place being careful not to disturb the alignment of the pump's driveshaft. Reinstall the pump's mounting bolts and tighten them by hand until they are finger tight.
Inspect the pump's driveshaft through the distributor mounting hole. Make sure the alignment along the engine's centerline is still intact. If the alignment is off remove the pump, realign the shaft and reinstall. If the alignment is right tighten the mounting bolts. The mounting bolts should be tightened to 17 ft.-lbs.
Inspect and clean or replace the oil pick-up unit then reinstall. Install the engine's oil pan. Remove the old oil filter and install the new one. This Step is strictly optional but recommended when changing the oil. Remove the drain pan, all tools, and the jack stands from under the car and lower it to the ground.
Reinstall the oil dip stick. Reinstall the engine's distributor. This Step is unnecessary for turbo engines. Replace the upper timing belt cover. This Step is unnecessary for turbo engines.
Refill the engine with 4 1/2 quarts of fresh oil. Reconnect the negative battery cable. Start the car and allow it to run for a few minutes. Check the engine's timing, oil pressure and oil level. Add additional oil if necessary.
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