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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!
In order to replace the rear main seal you will need some auto repair tools and experience . this is a big job , the transmission must be removed to replace this seal, also make sure that the seal is the leak,
oil always flows down, a leak on the top of the engine will flow down and drip at the center rear and look like a rear main seal , make sure that is the leak!!.
Depending on what engine you have and if it has 4 wheel drive the time for a shop to do is from 7 to 10 hours depending on engine size and 4wd,
you will have to dimantle rear hub withdraw driveshaft and replace seal oon axle drain axle oil first square drain plug in centre of axle hope this helps
It is recommended that you lift out the engine before attempting to replace the oil pan. Once the engine is lifted you can remove the bolts, remove the pan, clean all the old gasket material.
Installation:
Remove the rear main bearing cap oil seal
Remove the timing cover oil seal
Clean all the mating surfaces and seal grooves
Install new oil pan front cover seals
Install a new rear main bearing cap oil seal
Install new oil pan side gaskets on the block
Make sure the tabs of the front and rear seal fit properly as these are critical spots
Attach the oil pan to the engine block and install the retaining bolts
Inspect the shock absorbers, if you see any sign of oil leakage on them, then you need to change them.
Depending on the type of noise your car might need to be oiled or have other parts changed.
Good luck
SECTION 205-02B: Rear Drive Axle/Differential — Ford 8.8-Inch Ring Gear
2003 Mustang Workshop Manual
IN-VEHICLE REPAIR
Axle Shaft
Removal
Raise and support the vehicle. For additional information, refer to Section 100-02 .
Remove the wheel and tire assembly. For additional information, refer to Section 204-04 .
Remove the rear brake disc (2C026). For additional information, refer to Section 206-04 .
Remove the differential housing cover (4033) and drain the lubricant. For additional information, refer to Differential Housing Cover in this section.
Remove the differential pinion shaft (4211).
Remove the differential pinion shaft lock bolt (4241).
Remove the differential pinion shaft.
CAUTION: Do not damage the rubber O-ring in the axle shaft groove. Remove the U-washer (4N237).
Push the axle shafts (4234) inboard.
Remove the U-washer.
CAUTION: Damage to the rear brake anti-lock sensor (2C190) may occur if it is not removed before the axle shaft. Carefully remove the rear brake anti-lock sensor. For additional information, refer to Section 206-09A .
CAUTION: Do not damage the wheel bearing oil seal. Remove the axle shaft.
--------------------------------------------------------------------------------------
Rear Wheel Bearing and Axle Shaft Oil Seal
Removal
Remove the axle shaft (4234). For additional information, refer to Axle Shaft in this section.
NOTE: If the wheel bearing oil seal is leaking, the axle housing vent may be plugged. Using the special tools, remove the rear wheel bearing and wheel bearing oil seal.
Installation
Lubricate the new rear wheel bearing with the specified lubricant.
Using the special tools, install the new rear wheel bearing.
Lubricate the lip of the new wheel bearing oil seal.
Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
Using the special tools, install the new wheel bearing oil seal.
Install the axle shaft. For additional information, refer to Axle Shaft in this section.
Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
CAUTION: Do not damage the wheel bearing oil seal. Install the two axle shafts.
CAUTION: Do not damage the rubber O-ring in the axle shaft groove. Install the U-washer.
Position the two U-washers on the button end of the axle shaft.
Pull the axle shaft outward.
NOTE: If a new pinion shaft lock bolt is unavailable, coat the threads with Threadlock and Sealer EOAZ-19554-AA or equivalent meeting Ford specification WSK-M2G351-A5 prior to installation. Install the differential pinion shaft.
Align the hole in the differential pinion shaft with the case lock bolt hole.
Install a new differential pinion shaft lock bolt.
Install the differential housing cover and fill the rear axle with the specified lubrication. For additional information, refer to Differential Housing Cover in this section.
Install the rear brake anti-lock sensor. For additional information, refer to Section 206-09A .
Install the rear brakes. For additional information, refer to Section 206-04 .
Install the tire and wheel assembly. For additional information, refer to Section 204-04 .
If they are sealed bearings, you will need a press to get them out. If they are bolt in, just remove the brake pads/rotors, then the axle nut, then the bolts holding the wheel bearing in. Install in reverse order.
Raise and support the vehicle. For additional information, refer to Section 100-02 .
Remove the wheel and tire assembly. For additional information, refer to Section 204-04 .
Remove the differential housing cover (4033).
Loosen the bolts and drain the lubricant from the rear axle housing (4010).
Remove the bolts.
Remove the differential housing cover.
Remove the rear brake disc (2C026). For additional information, refer to Section 206-04 .
CAUTION: Turning the differential case (4204) or an axle shaft (4234) with the differential pinion shaft (4211) removed will cause the differential pinion gears (4215) to fall out of the assembly and damage the components. Remove the differential pinion shaft.
Remove the differential pinion shaft lock bolt.
Remove the differential pinion shaft.
CAUTION: Do not damage the rubber O-ring in the U-washer groove.
Remove the U-washer (4N237).
Push the axle shaft inboard.
Remove the U-washer.
Reinstall the differential pinion shaft.
Install the differential pinion shaft.
Install the differential pinion shaft lock bolt finger-tight.
CAUTION: Do not damage the wheel bearing oil seal (1177). Remove the axle shaft.
----------------------------------------------------------------------------------------------------------------- Seal Removal
Remove the axle shaft (4334). For additional information, refer to Axle Shaft in this section.
CAUTION: Never remove the wheel bearing oil seal (1177) by itself. Always remove the rear wheel bearing (1225) and the inner wheel bearing oil seal at the same time. NOTE: If the wheel bearing oil seal is leaking, the axle housing vent may be plugged with foreign material. Using the special tools, remove the rear wheel bearing and wheel bearing oil seal together.
Installation
Lubricate the new rear wheel bearing.
For 4.0L SOHC and 4.0L EI with limited slip rear axles and 5.0L vehicles, use SAE 75W-140 High Performance Rear Axle Lubricant F1TZ-19580-B or equivalent meeting Ford specification WSL-M2C192-A.
For 4.0L SOHC and 4.0L EI with conventional rear axles, use SAE 80W-90 Premium Rear Axle Lubricant XY-80W90-QL or equivalent meeting Ford specification WSP-M2C197-A.
Using the special tools, install the rear wheel bearing.
Lubricate the lip of the new wheel bearing oil seal.
Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
Using the special tools, install the wheel bearing oil seal.
Install the axle shaft. For additional information, refer to Axle Shaft in this section.
Its a 4 cylider 4 wheel drive
Is the vehicle a 4 or 6 cylinder? Is it 2 or 4 wheel drive?
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