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Have an 05 f-150 4.6. I replaced rear main seal and did not Mark the flex plate when i took it off. How do I install it in the same position to where I don't have a balance problem?
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Any vehicle with a rear main seal leaking, you must remove the transmission if the seal is one piece, goes in from the back. you'll need remove the flywheel/flex-plate to change the seal. Older versions you had to drop the oil pan and the rear main cap to replace a 2 piece seal. Take everything off the top of the trans to access the top mounting bolts and remove them. Support the engine and remove the trans mount. Pull the cover off the torque converter and remove the flex-plate to torque converter bolts then remove the rest of the trans bolts at bell housing and pull the trans out. You can use a transmission jack or like I do, just set the trans on top of a metal case on top of a barrel so you don't have to drop it all the way out. Just slide it out far enough to change the seal and put it back together.
Oil leaking "in" your valve cover? Where is the oil at/coming from? And, to answar your question, rear main seal is a real job! Requires removing transmission, flex plate/fly wheel! It is the crank shaft seal, on the "rear" of the engine!
Remove the transmission and then the flex plate. Use an awl to pry out the seal and clean the area. Install the new seal around the crankshaft and with a seal installer push the new seal to its seat.
If you mean that the rear main seal is leaking, and it's not the oil pan seal...most all vehicles use a one piece seal, and you remove it by removing the transmission, and then the starter flex plate.
I'm not sure if this is the right part of your car but, are you talking about the rear seal on the engine for the crankshaft?
If so:
Rear Main Oil Seal REMOVAL & INSTALLATION
Fig. 1: Rear main seal installation for the 2.3L and 2.5L engines
Fig. 2: Removing the rear main seal
Fig. 3: Installing the rear main seal on the 2.9L engines
If the crankshaft rear oil seal replacement is the only operation being performed, it can be done in the vehicle as detailed in the following procedure. If the oil seal is being replaced in conjunction with a rear main bearing replacement, the engine must be removed from the vehicle and installed on a work stand.
Remove the starter.
Remove the transmission from the vehicle, following the procedures in Section 7.
On a manual shift transmission, remove the pressure plate and cover assembly and the clutch disc following the procedure in Section 7.
Remove the flywheel attaching bolts and remove the flywheel and engine rear cover plate.
Use an awl to punch two holes in the crankshaft rear oil seal. Punch the holes on opposite sides of the crankshaft and just above the bearing cap to cylinder block split line. Install a sheet metal screw in each hole. Use two large screwdrivers or small pry bars and pry against both screws at the same time to remove the crankshaft rear oil seal. It may be necessary to place small blocks of wood against the cylinder block to provide a fulcrum point for the pry bars. Use caution throughout this procedure to avoid scratching or otherwise damaging the crankshaft oil seal surface.
To install:
Clean the oil seal recess in the cylinder block and main bearing cap.
Clean, inspect and polish the rear oil seal rubbing surface on the crankshaft. Coat a new oil seal and the crankshaft with a light film of engine oil. Start the seal in the recess with the seal lip facing forward and install it with a seal driver. Keep the tool, T82L-6701-A (4-cyl. engines) or T72C-6165 (6-cyl. engine) straight with the centerline of the crankshaft and install the seal until the tool contacts the cylinder block surface. Remove the tool and inspect the seal to be sure it was not damaged during installation.
Install the engine rear cover plate. Position the flywheel on the crankshaft flange. Coat the threads of the flywheel attaching bolts with oil-resistant sealer and install the bolts. Tighten the bolts in sequence across from each other to the specifications listed in the torque chart in this section.
On a manual shift transmission, install the clutch disc and the pressure plate assembly following the procedure in Section 7.
Install the transmission, following the procedure in Section 7.
While you have the transmission removed be sure to replace the rear main bearing seal.On a1982 you will have to remove the oil pan to replace the seal,It has a two piece seal.After removal of the oil pan carefully remove the back main bearing cap,you will have to use a straight pick to roll the top seal out of the block.Lubricate the deal with oil before you install it.Be sure to get a new oil pan gasket with your other parts.Make sure you torque your main bearing cap to manufacturer's specifications.
Remove the transmission, after holding the rear of the engine supported, using a jack with a piece of wood between it and the engine. Remove the clutch and pressure plate, and the flywheel or if automatic, the flex plate. The rear main seal retainer will then be exposed. Remove the 2 oil pan to main seal retainer assembly, and the bolts circling the retainer, and slide the retainer assembly unit back off the crankshaft. Remove the old gasket from the retainer, and clean the gasket ridge before installing a new gasket. It's a one piece hard rubber gasket, which must be inserted in the retainer evenly. This can be done on a work bench, or flat wood on a concrete floor, Some light oil might help it seat easier, Once seated slide the retainer containing the new gasket back over the rear of the crankshaft, A rubber hammer will help ease it back into position, Replace all bolts, not forgetting the oil pan to retainer bolts, and reinstall all parts in reverse order of removal. If a manual trans, this would be an excellent time to install a new clutch kit.
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