Whats this?

It's the axle tube oil seal that's leaking due to excessive lateral movement of the half shaft within it caused by excessive wear in kingpin or wheel bearings. Not the swivel seal as that keeps stuff out not in.

Get some new kingpin bearings from Martin which will come with the oil seal.

Then follow Martin's fitting guide and all should be well!

Kirkynut

Yes - its NEVER the large swivel seal. This seal is really designed to keep dirt out, not grease/oil in. The joint inside is "dry" (ok - so it has grease packed into the CV and a small amount around the ball), therefore any leaking is a problem. The problem is usually the King Pin bearings themselves.

If you are doing the bearings you can replace the large seals but more often than not a quick wipe with an oily rag will bring them up nicely.

Martin