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First of all, it is very easy to determine which one is leaking.
If you got oil leaking right below the (rear) stat gear ONLY, it's the o-ring.
Oil leaks between the rear iron and the rear stat gear and drips down the back of the rear iron.
If you got oil ALL OVER THE PLACE back there, it's the (rear) main oil seal.
In this case, oil bypasses the gear and leaks onto the rotating assembly / counterweight / flywheel.
This is why it's flung all over the place.
If you don't need to remove the rear stat gear...DON'T.
If the stat gear needs to be replaced, it's a bitch to get it back in there if it does move - most likely it will.
By slowly rotating the engine (via the front - usually the front eccentric bolt) with the help of a friend, you can get the rear stat gear to go back in.
I doubt anything in the front cover (i.e. Torrington / thrust washer / etc.) fell out.
There is no way those things should get loose unless you remove the front eccentric bolt!
If the engine has significant resistance to hand turning, something is drastically wrong...
-Ted
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