Wheel bearing leaking again - why???

theres two seals on the hilux's, if you damage one of them you will get a leak. total parts cost is under $20. the only problem is you will need to buy the kit which costs roughly $50.

Also check that you didn't pinch or damage the seal when you put them in and put plenty of grease on the wear area's, also check to see if there is any pitting, scoring or grooving if the machined surface.

I just did the both back ones, i have drums, so pulling off all of the drum crap and then doing the rebuild, i screwed up the drivers side so will have to do it again, fun.

also there is a seperate large o-ring seal that if you don't put in it will leak also. if you still have problems put som good quality rtv sealant around the mating faces only.

bent axle is a real possability, most mechanics fit a speedy sleeve - if this has been done then yes you def have an issue, if not why do they keep replacing the seals without one

also seals should always be genuine toyota.

is the diff breather blocked??
Could also show up a leak, that otherwise would not be there.

T

1) diff breather is a good place to start
2)Too much oil in diff
3) bent diff housing
4) Try a genuine seal as there are some poor quality ones kicking around the traps
Or ring Superior for a HD axle seal as this page mentions rear ones (not sure about Hilux though)
http://www.superiorengineering.com.au/product_info.php?cPath=10_11_13_240&products_id=3047

5) Another thing is the oring seals for the backing plate/bearing dont always seal the bestaround the flange. A lot of repair places put a bead of oil resistant silicon over the top of the oring when re-installing (I didnt like this idea either to begin with, but it certainly works). Helps stop getting water in too!

Thanks all for the suggestions. Some possible suggested causes can be ruled out, eg breather is not blocked, oil level is fine. The mechanic has suggested taking out the axle and checking that for bends, scoring etc so we'll have a look and see what eventuates.

Re the "genuine parts" debate, well the first replacement was supposedly a genuine, at a Toyo dealer under warranty, but that lasted only about 3000km before leaking, so not a good recommendation, but maybe it was the mechanics, not the parts??

I'll post back here again if anything definite shows up after the job is done.

Cheers, John