I have two apparently different hub seals here, ftc 4785 and rtc 3511. Is one an old and superseded part or are they for different years. I do recall talk of different seals, is one better than the other ? Which should I use on my 90 ?

Mo

3511 is the older type seal that is reputed to be better than 4785. They are interchangable.

Just using this as an excuse to play with image shack.
Sorry they're a tad big

Thanks Mark
Good enough excuse Gromit

Mo

Having just fitted a '4785.. It efectively a triple seal with a further dust shield. There is a double inner set of lips nearest the bearing, an outer single seal and then the 4th bit is nearest the backplate, this is more a "deflector" to keep the grud away from the other lips. This seal is to be fitted with the main body of the seal 4mm lower than the top edge of the hub bore - its marked as such on the edge of the seal. If you pop one over the bare stub axle you will see the function of the outer most dust shield bit.

Look at Les' excellent write up on rebuilding a swivel. '4785 type seal is in the dismantled hub showing it resessed by 4mm and the outer "deflector" seal.

Thanks Simon, I've put the 3511s in now, but I'll bear that in mind for future fits.
cheers
Mo