How to Replace an Oil Pump in Cars

by Contributing Writer

The oil pump is an essential piece of equipment that keeps your Mitsubishi car running. It lubricates the engine by keeping the oil circulating. Without this lubrication, the engine wouldn't run. An oil pump is usually located in the oil pan. If you want to change the oil pump and replace it with a new one, roll up your sleeves and get ready for some dirty work.

Under The Hood:

 How to Replace an Oil Pump in a Dodge Caravan

Remove the Oil Pump

Drive your Dodge Caravan up onto ramps or lifts so you have room to work as you pull out the oil pump. You could also use a jack, but make sure you brace the front wheels and engage the parking break so the car doesn't roll.

Disconnect the negative battery cable on your Dodge Caravan. Drain the engine oil and coolant into separate pans. Take the vehicle off the ramps or lifts. Remove the accessory drive belts and use an engine support tool to hold the weight of the engine.

Take out the right engine mount and bracket. Take off the timing belt cover and loosen the bolts on the timing belt tensioner. Remove both the tensioner and the timing belt then raise the vehicle back on the ramps or lifts.

Take out the oil pan assembly and remove the oil pump pick-up and the O-ring. Take the crankshaft damper out with a good puller. Use a puller to also draw the crankshaft sprocket from the front of the crankshaft.

Loosen the bolts on the oil pump and take them off. Remember where they were since you'll need to replace them later. Unscrew the relief valve.

Install the New Oil Pump

Clean all the parts to remove contaminants and debris then install the inner rotor. Make sure the chamfer faces the cast iron oil pump cover on the back. Torque the bolts to 105 in. lb.

Install the relief valve, followed by the spring, gasket and cover cap. The cover cap should be tightened to 40 ft. lb.

Fill the rotor cavity with clean engine oil to prime it then insert a new O-ring seal into the oil pump. Put Mopar Gasket Maker or equivalent anaerobic type gasket sealer on the flange of the oil pump body.

Align the oil pump rotor flats with the flats on the crankshaft and install the pump slowly, tightening the fasteners to 20 ft. lb. Add the new front oil seal and install it with the spring side facing the inside of the engine. Even it out with the engine cover.

Install the crankshaft sprocket with the special sprocket tool. Put on the oil pump pick-up tube and O-ring and torque the bolt to 20 ft. lb.

Insert the oil pan and install a new oil filter. Lower your vehicle then install the timing belt and covers and crankshaft damper with a tool specialized for the 2 mm by 1.75 by 150 mm bolt. Tighten the center bolt to 105 ft. lb.

Put on the accessory drive belts and adjust them to the right tension. Put on the engine mount and bracket then take out the engine support tool.

Add fresh oil to the engine and refill the cooling system. Use a 50/50 mixture of clean, ethylene glycol antifreeze and water in the cooling system. Start your engine and check for leaks.

Items you will need

  • Ramps or lifts

  • Engine support tool

  • Pan for your old engine oil and coolant

  • Puller for crankshaft

  • New oil pump

  • Sprocket tool

  • Specialized crankshaft tool for the 2 mm by 1.75 by 150 mm bolt

  • Engine oil

  • 50/50 mixture of clean, ethylene glycol antifreeze and water

 How to Replace an Oil Pump in a Mitsubishi Eclipse

Remove Old Oil Pump

Drive your Mitsubishi Eclipse up onto ramps or lifts so you have room to work as you pull out the oil pump. You could also use a jack, but make sure you brace the front wheels so they don't roll. In addition, set the emergency break firmly into position so the car doesn't roll.

Disconnect the negative battery cable and rotate the engine so that the No. 1 cylinder is in the top dead center of its compression stroke, then drain the oil out of the engine.

Mount the engine with the proper blocks and take out the front mount brackets and accessory drive belts. Remove the timing belt upper and lower covers, the timing belt itself and the crankshaft sprocket.

Disconnect the electrical connector for the oil pressure sending unit and the oil pressure sensor. Take out the oil filter, the oil filter bracket, the oil pan, the oil screen and gasket.

Remove the plug cap in the engine front cover using special tool MD998162 and disconnect the plug on the side of the engine block. Carefully put a steel rod with a shank diameter of 0.32 inches into the plug hole to told the silent shaft.

Take off the driven gear bolt, which secures the oil pump driven gear to the silent shaft. Also remove the front cover mounting bolts while observing their lengths.

Remove the case cover and the oil pump assembly, taking out the silent shaft if necessary. Remove the oil pump cover, which you will find on the back of the engine front cover. Also remove the oil pumped drive and driven gears.

Clean all the components carefully to remove contaminants and gasket material. Put the oil pump gears into the front case, rotating the front case to make sure there is a smooth rotation and that there is no looseness. Check for ridge wear and replace components if necessary.

Install the New Oil Pump

Line the timing mark on the oil pump drive gear to that on the driven gear. Install them into the engine front case and add engine oil to all the gears.

Install the cover of the oil pump and torque the bolts to 13 ft-lb. Use a proper driver and install the new crankshaft seal into the front case.

Set the new case gasket into position and put the seal guide tool MD998285 on the front end of the crankshaft. This will protect it from damage. Add a small amount of oil to the outer part of the seal pilot tool.

Insert the front case assembly through the new front case gasket, temporarily tightening the flange bolts. With the new oil filter bracket and gasket in place, mount the oil filter onto the bracket. Put the bolts with washers on and torque them to 14 ft-lb.

Slip a Phillips screwdriver into the hole that you see on the left side of the engine block. This locks the silent shaft in place. Install the oil pump drive gear onto the left silent shaft and tighten the driven gear bolt to 27 ft-lb.

Put a new O-ring on the groove in the front case and install the plug cap, tightening the cap to 17 ft-lb. Insert the oil screen into position with new gasket in place. Clean the cylinder block and the mating surfaces of the oil pan and apply sealant into the roof on the oil pan flange. Install the oil pan within 15 minutes and tighten the bolts to 60 in-lb.

Connect the oil pressure gauge unit and the oil pressure switch as well as the electrical harness connector and the oil cooler. Torque the oil cooler bolt to 31 ft-lb.

Add fresh oil into the engine and install a new oil filter. Reconnect the negative battery cable and start the Mitsubishi Eclipse engine. Check for leaks.

Items you will need

  • Ramp or lifts

  • Pan for old engine oil

  • Wrench

  • Special tool MD998162

  • Rag for cleaning

  • New engine oil

  • New oil pump

  • Seal guide tool MD998285

  • Phillips screwdriver

  • New O-ring

 How to Replace an Oil Pump in a Lincoln Navigator

Drive your Lincoln Navigator up onto ramps or lifts. If you use a jack, brace the front wheels so they don't roll. Set the emergency break.

Take out the timing chain and the oil pan. Remove the three bolts for the oil pump screen and take off the screen and cover.

Remove the oil pump screen and cover spacer. Undo the four oil pump mounting bolts and take the oil pump out of the engine.

Replace the old oil pump. Put the four oil pump mounting bolts on loosely then tighten them to 71 to 106 in-lb.

Reinstall the oil pump screen and cover spacer, tightening them to 15 to 22 ft-lb. Put on the oil pump screen and cover with the bolts. Tighten the bolts near the screen to 15 to 22 ft-lb and bolts at the other end of the pickup to 70 to 106 in-lb.

Put the timing chains back on and insert the oil pan. Start the Lincoln Navigator engine and check for leaks.

Items you will need

  • Ramp or lifts

  • Wrench

  • Oil pump

 How to Change an Oil Pump in a Buick LeSabre

Open the drain plug on the oil pan underneath the car using a box-end or flare-nut wrench; the plug is at the rear of the pan. Drain the oil into a pan that can hold at least 5 quarts.

Unscrew and remove the oil filter--located beside the oil pan--using a filter wrench.

Remove the five screws for the oil pump cover using a T-30 Torx driver and then lift off the timing chain cover with the oil pump drive gear and driven gears.

Remove the gears from the pump cover.

Pack the body of the new oil pump within its cover with petroleum jelly and and install the gears in place, making sure they force the jelly into every cavity.

Install the oil pump cover--and the oil pump within it--onto the timing chain cover using the Torx screws.

Install a new oil filter under the car, lubricating its gasket with fresh oil; tighten the filter by hand, not with the wrench. You should always replace the oil filter whenever you drain the oil and remove the old filter.

Add 4 quarts of fresh engine oil through the engine's filler tube.

Items you will need

  • New oil pump and cover

  • T-30 Torx screwdriver

  • Petroleum jelly

  • Oil drain pan

  • Box-end wrench

  • Filter wrench

  • 4 qt.10W30 engine oil

  • New oil filter

 How to Replace an Oil Pump in a Pontiac Bonneville

Remove the Oil Pump

Utilize an engine support fixture to support the engine to keep you safe while you work. Disconnect the negative battery cable and remove the engine drive belts and tensioner assembly.

Remove the drive belt idler pulley and the bracket. If necessary, take off the torque axis mount bracket.

Take off the engine front cover assembly and the oil filter adapter along with its pressure regulator valve and spring.

Finish the removal of the old oil pump by taking the oil pump cover off and removing the inner and outer pump gears.

Install the New Oil Pump

Lubricate the gears on the oil pump with petroleum jelly then install those gears into the pump housing. After you do this, pack the gear cavity with more petroleum jelly.

Install the new oil pump cover for your Pontiac Bonneville by torquing the screws on it to 97 in-lb. Install the oil filter adapter with a new gasket, pressure regulator and spring, torquing the bolts to 11 ft-lb.

Re-install the front cover assembly, the tensioner assembly and the drive belt idler pulley and bracket if you removed them prior to installing the new oil pump.

Put the drive belts back in along with the torque axis mount bracket. Reconnect the negative battery cable and take away the engine support fixture.

Tighten the retaining bolts up to 106 in-lb. and tighten the nuts to 18 ft-lb. Reinstall the oil filter adapter and put the engine cover back on using your wrench to tighten the bolts.

Check to make sure your engine oil level is correct then start the vehicle and check for leaks where you were working.

Items you will need

  • Engine support fixture

  • New oil pump

  • New O-ring seal

  • Wrench

  • Petroleum jelly

 How to Replace an Oil Pump in a Subaru Outback

Remove the Oil Pump

Drive your Subaru Outback up onto ramps or lifts so you have room to work as you pull out the oil pump. You could also use a jack, but make sure you brace the front wheels so they don't roll. In addition, set the emergency break firmly into position so the car doesn't roll.

Disconnect the negative battery cable then take off the engine undercover. Drain the air conditioning coolant.

Take out the radiator main fan and the sub fan assemblies if you have an Impreza model. Take out the radiator if you have a Legacy model.

Disconnect the crankshaft and camshaft position sensors then remove the drive belts. Continue component removal by taking out the rear side V-belt tensioner, the crankshaft (using a good crankshaft removal tool), the water pump, the timing belt guide (if it has a manual transaxle) and the crankshaft sprocket.

Remove the oil pump mounting bolts and the oil pump itself, gently prying it from the engine block.

Install the Oil Pump

Take some measurements and replace components if they do not meet the following specifications: The tip clearance of the rotors should be under 0.0071 inches; the clearance between the outer rotor and the cylinder block rotor housing should be less than 0.0079 inches; and the side clearance between the oil pump inner rotor and the pump cover should be less than 0.0059 inches.

Put your new oil pump together and apply sealant to the new O-ring as well as the oil pump. Install the oil pump, torquing the bolts to 60 in-lb.

Connect or install the following components in order: the crankshaft sprocket, the timing belt guide (if you took it out), the water pump, the crankshaft pulley (using the special tool again), the rear side V-belt tensioner, the drive belts, both sensors you removed previously, the radiator (for Legacy models), the radiator main fan and sub fan assemblies (on Impreza models) and the engine cover.

Reconnect the battery cable then fill and bleed the cooling system. Start the engine on your Subaru Outback and look for leaks around your new oil pump.

Items you will need

  • Ramp or lifts

  • Pan for drained fluids

  • Crankshaft removal tool

  • Wrench

  • New oil pump

  • New O-ring

  • New coolant fluid