Thinking about purchasing a new car? Use our new Car Loan Calculator to estimate your monthly car payment!

How to Replace an Oil Pump in a Mitsubishi Eclipse

by Contributor

The oil pump is an essential piece of equipment that keeps your Mitsubishi Eclipse 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.

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

About the Author

This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.

More Articles