I've replaced other oil seals. I have used a small Allen key. Holding the Allen key with pliers and using it to hook the inside of the seal to pull it out. My first time replacing an oil seal I bent the new seal when I tried to install it and had to go buy another one.
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I wouldn't be surprised if you didn't have to remove the engine/transmission, split the trans from the engine, remove the TC or clutch/pressure plate, (you should have drained engine oil and auto trans oil before doing this), remove the oil pan, remove the rear most main bearing cap, rotate a new seal into place, replace rear main bearing cap, torque, etc. and reassemble.
Worst case you may have to remove harmonic balancer and front timing chain cover, front seal, release all the connecting rod caps and main bearing caps, remove the crankshaft, replace the rear main seal and reassemble. It's a 1966 engine...you should consider replacing the front timing chain with a roller chain as well as rod and main bearing inserts if you have to do all this.
The oil filter housing and the timing cover can all be worked on with engine in car. For the rear engine seal (rear main seal), the transfer case and transmission will have to be removed to access the seal. Most of the time, the oil pan can be removed without raising the engine. Check your clearance under there for anything obstructing removal. (I loaned out my Jeep manual and never got it back!) On some cars, engine needs to be raised about 4 inches for pan to clear the oil pickup tube. Don't know about your Jeep.
YOU NEED TO REMOVE FLYWHEEL REMOVE OIL PAN. REMOVE REAR OIL SEAL HOUSING BOLTS. USING THE PRY POINT LOCATED AT THE EDGE OF THE CRANKSHAFT REAR MAIN SEAL HOUSING SHEAR THE RTV SEALANT. REMOVE THE REAR MAIN OIL SEAL. INSTALL GUIDE PINS INTO THE TWO CRANK SHAFT REAR OIL SEAL HOUSING CORNER BOLT HOLES OF THE ENGINE BLOCK.INSTALL THE CRANKSHAFT REAR SEAL INSTALLING TOOL ONTO THE REAR OF THE CRANKSHAFT FLANGE. APPLY A 0.2 INCH 3MM BEAD OF SILICONE SEALANT TO THE REAR OIL SEAL HOUSING . INSTALL THE REAR HOUSING TO THE ENGINE BLOCK.REMOVE THE GUIDE PINS AND INSTALL THE HOUSING BOLTS TIGHTEN THE BOLTS TO 89 INCH LBS. REMOVE THE REAR SEAL INSTALLATION TOOL FROM THE CRANKSHAFT FLANGE.THEN INSTALL OIL PAN AND FLYWHEEL.
For this to be done you must purchase a rear main seal by visiting your local parts store and then you must incline the engine remove drive shaft, remove transmission mount, and remove the transmission then you are able to access the rear main seal.
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?
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.
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.
There is some work involve in replacing rear main seal, seal sit in the rear of the engine block, the transmission will have to be remove, and the fly wheel to get to the rear main seal.If you have never removed a engine or transmission, it might be best to pay and have some one do it for you.
Remove the rear oil seal housing and gasket.
Rear seal removal 3.8L
Remove the rear main seal by placing the housing face down on 2 blocks of wood. Using a drift tool and hammer tap the seal out of the housing.
To Install: NOTE: Do not lubricate the rear main oil seal or the installation tool. Do not touch the sealing lip of the rear main seal once the protective sleeve is removed. NOTE: Use a clean lint free cloth to clean the crankshaft sealing surface. Remove sharp edges or burrs that could damage the rear main oil seal. Remove burrs or sharp edges with a crocus cloth.
Carefully remove the rear oil seal from the protective sleeve.
Install the oil seal onto the seal driver EN-47623 or equivalent by placing the seal at an angle and twisting until it is fully seated.
Install the seal into the housing using the seal driver EN-47623 or equivalent and driver handle J-8092 or equivalent. Apply downward force until the seal is seated.
NOTE: Ensure that the housing gasket is installed correctly and that the oil passages are not blocked.
Using a new gasket Install the rear oil seal housing on the engine being careful not damage the rear main seal.
NOTE: The plastic inserts are used in production and are not needed for assembly.
Hand tighten the bolts.
Rear seal housing alignment 3.8L
Place a straight edge on the crankshaft rear oil seal housing flange and the engine block oil pan flange. Using a feeler gauge check that there is no more than .0004 in (0.10 mm) step on each side. Rotate the housing to make the steps equal on both sides.
Tighten the housing bolts 11 ft-lb (15 Nm) plus an additional 50 degrees.
Ensure that the housing did not move out of specification. Repeat step 6 if the oil seal housing is not within the specified range. Replace the rear oil seal housing if the specified measurement can not be reached.