On the 2a (and 2 and 3) there is free communication from the diff along the axle to the drive flange and then back through the bearings (outer then inner) to the seal on the inside of the hub. The seals that keep the oil in are this seal, the paper gasket under the drive flange, and the felt/rubber seal on the axle shaft under the nut and washer attaching it to the flange. All should be replaced when doing the bearings. Also note that the effectiveness of the main seal is dependent on the state of the sleeve it runs on on the stub axle. It is quite possible this will need replacing, and if you remove the stub axle to do this you should also replace the paper gasket at this joint. Nowhere, in my view, is any extra sealant indicated, although sometimes I have used gasket cement to ensure the hub cap stays on.. Paper gaskets should have a light coating of grease on one side, and all sealing surfaces must be free from burrs and dirt.
Also check the axle breather as if this is blocked you will get leaks. In my experience, leaking under the hubcap is likely to indicate loose bearings. Another indicator for this is leakage under the drive flange and if these bolts keep coming loose. Do not overtighten the flange bolts, as removing the broken bit will not be easy, and they are often stretched as a result of overtightening, which may also lead to their coming loose as they no longer fill the hole, allowing movement.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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