80 Series leaking hubs - a possible solution?

I don't have specific knowledge of the difference in specs for the full time/part time 80 series axles, but the father inlaw has a early model F150 which has a non-standard diff and had leaky seal problems. It was the rear, and the leak was at the diff end of the axle, but the issue was a couple of mills difference in the axles. Hope this is of some help.

I take it yours is an early constant drive. And yes there is a difference in length. Later ones were longer and also different flange plates. If you have had c/v's replaced and they used later model one's and didnt change the drive flange plates your dealer is right. common problem.

Mine leaks too (lots and mainly on the left - I dont think the axles are the wrong ones though...??? 97 Standard 80 series, part time 4wd

hey tony,
i had an old LUX that used to leak, and i was too lazy to do the seals, so i just bought a recon front diff, swapped em ova in a couple of hours (two people), filled it full of oil, and never had a problem. Maybe this will suit your circumstances better, haveing to go away soon and all, and no troubleshooting to do!
Cheers
Wayne-o

Stupid question, but i had a rocky with the same problem, took it to the dealer and all they replaced was the outside felt etc seals. So the oil seals have been replaced?

the seal that leaks is the tube seal up in diff housing.it leaks diff oil into hub which is full of grease so then washs grease out past large ball seal. You need to change bronze bush in stub axle & then REAM it to size, this bush stops axial movement of drive shaft thus tube seal lasts 200 000 KM again
Cheers Graham

You are using "Genuine" inner axle seals aren't you?? I say that because I did my swivel hubs a while back and used the inner seals that came with the kit.. within 6 months I had the oil dripping out the bottom of the hub and had freshly washed out wheel bearings.. so I changed the seals again... much to my dismay I went down to the local spares shop and bought a couple of inner axle seals and went through the entire process of changing them out etc only to have them fail again in another 6 months........

So I was thinking to myself... do I need to put a sleeve on the axle or get it machined or replace the axle etc etc... when I spoke to the guy at Toyota (who coincidentally owned an 80 series similar to mine) he said only use the genuine inner seals as they are a better design and the materials used in construction are better.. so I bought a couple for $15 each and did the entire job again...

Result - Not a drop of oil since... approx 12 months since putting the genuine inner seals in place...

I can't see how the axle length would make it leak anyway as it is a wiper seal so a bit of back and forwards motion is pretty much irrelevant.. the oil will escape readily if the axle diameter is less than the seal or if there is sideways pressure on the seal opening it up on the other side..

Best of luck with it!

Hi Tony,
If you are getting oil leaking out through the hub, the inner oil seal is gone. That is the seal that keeps the diff oil out of the hub. There should only be grease in the hub. Replace the inner oil seal with good quality new ones and try again. Same for front and rear hubs.

Mike.

Misalignment of the axle through the seal will cause this, too. Have the upper and lower swivel housing bearings been replaced? Setting up the knuckle height in relation to the axle is important to stop this happening, done by using shims. 40-45 series cruisers suffered from this as they were set up for LHD and funny cambered roads.

There is definitely a difference in CV between the constant 4wd and the part time 4wd. They are a different end.
Only use genuine toyota inner axle seals.
I would put 2 new cv joints on your axles with 2 new inner axle seals and you will be right for years.