To reach the oil pump in the 1989 Ford F-150, you must remove the oil pan. Once the oil pan is out of the way, changing the oil pump is a simple process. When the oil pump goes bad, which is rare, it does not pump enough oil to the top of the engine, which causes engine wear and will eventually lead to engine failure. If you have the oil pan off for another reason, and the F-150 has more than 100,000 miles on it, you should take the opportunity to change the oil pump.
Tools Used: 2 drain pans, Set of wrenches, Set of sockets, Floor jack, Jack stands, Wood blocks, Screwdriver, Rags, RTV silicone, Torque wrench
Change the Oil Pump
Place a clean drain pan under the radiator petcock. Loosen the petcock and allow the antifreeze mixture to drain. If the mixture is less than five years old, you can reuse it. Remove the bolts that attach the fan shroud to the radiator. Push the fan shroud over the top of the fan. Remove the upper intake manifold and the throttle body (see Resources).
Remove the nuts and lockwashers that attach the engine support insulators to their brackets. Disconnect the oil cooler line on the left side of the radiator using the appropriate wrench.
Raise the F-150 with the floor jack, then lower it onto jack stands. Unbolt and remove the exhaust system using the appropriate sockets. Place a wood block on the floor jack. Roll the jack under the engine and lift the engine. Put wood blocks under the engine supports. Remove the floor jack.
Slide a drain pan under the oil pan drain plug. Loosen the drain plug and allow the oil to drain. Slide the floor jack under the transmission and raise it high enough to support the transmission. Unbolt and remove the transmission crossmember using the appropriate socket.
Remove the oil pan bolts and lower the oil pan onto the engine crossmember. Remove the nut that attaches the oil pump pickup tube to the No. 3 main bearing cap stud. Lower the pickup tube and the screen into the oil pan. Remove the oil pan from the vehicle. Unbolt and remove the oil pump using the appropriate socket. Remove the intermediate driveshaft from the oil pump if the new one does not come with one.
Prime the new oil pump by filling its inlet and outlet ports with oil. Rotate the oil pump shaft to distribute the oil. Position the oil pump's intermediate drive shaft into the distributor socket. Place the new gasket on the pump body. Insert the intermediate driveshaft into the pump body.
Install the oil pump and the intermediate driveshaft as an assembly. If the oil pump does not seal easily, rotate the intermediate driveshaft a millimeter or two, then try again. Repeat until the oil pump seals against the block properly. Install the oil pump retaining bolts. If your F-150 is a six-cylinder, tighten the oil pump bolts to 13 ft.-lbs. of torque. If your F-150 is a V-8, tighten the bolts to 25 ft.-lbs. of torque.
Clean the oil pan, the inlet tube and the gasket mounting surfaces with a rag and carburetor cleaner. If debris is stuck on and doesn't come off with a rag, scrape it with the screwdriver.
Place a 1-mm bead of RTV silicone on the oil pan. Allow it to set for two minutes. Press the oil pan gasket into the RTV. Place a 1-mm bead of RTV silicone on top of the gasket. Allow it to set for two minutes. Set the oil pickup tube and the screen on the oil pump. Install the lower attaching bolt and the gasket loosely. Install the nut that attaches the pump to the No. 3 main bearing cap stud.
Slide the oil pan onto the crossmember. Install the upper pickup tube bolt. Tighten the pickup tube bolts firmly. Push the oil pan up against the block. Install the oil pan bolts and tighten them to 11 ft.-lbs. of torque. Reinstall the transmission crossmember.
Jack up the engine and remove the wood blocks from under the engine supports. Insert and tighten the support bolts and nuts. Reinstall the exhaust system. Reconnect the oil cooler line on the left side of the radiator. Reinstall the nuts and lockwashers for the engine support insulators. Reinstall the upper intake manifold and throttle body.
Pull the fan shroud forward and reinstall the bolts. Fill the crankcase with oil. Tighten the radiator petcock, then refill the cooling system with the appropriate antifreeze mixture.
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