Loosing Rear Diff oil (1 Viewer)

[new45]

Hi all,

I just wanted to double check that I am on the right track before I spend money and pull my rear end apart. (HJ47 fully floating rear)

Im loosing rear diff oil somewhere, about 1L over a 2,500km trip.
Its not coming out of the pinion (no oil marks) or the breather (again no oil marks)
Even though there is no sign of a leak at the rear wheels it has to be leaving out of the seal there?

While Im there I will do the rear bearings which havnt been done in a few years. ?

Thanks for any advice.

 

[3_puppies]

losing 1L in 2500km trip? to us in the states that's over 1qt in 1500 miles give or take.
and no sign of it anywhere??

there's only a few places it could be going, out the pinion, out either axle hub end, out either hub inner seal onto the brakes, does a full float have a diff cover?, drain plug.

 

[shawnfj40]

Hmmmm No. Gear oil takes 20 to 30 years to evaporate. So it you are losing it, it is getting out of somewhere. It is a pretty simple structure and a leak should present itself pretty clearly.

 

[Oliver]

Was the vehicle level when you checked it? Was the oil hot /cold? Did it have the correct fill amount last time? If you're running a vacuum operated diff lock, maybe you now have a really good oil supply line to the pump!

Cheers

 

[new45]

None of the above guys, no diff locks and it was full when I left.

And you missed the question, if its not leaking from the pinion, breather or the fill/drain then it has to be the axle seals right?

I dont want to pull the rear end apart only to find its not there.

 

[Cruiserdrew]

Gear oil leaks are generally obvious since it makes a big sticky, clingy mess.

I would guess it was not full to begin with. I would replace the drain and fill gaskets, fill it, top it off after a short drive, and check it in a couple thousand miles. You may have nothing wrong at all.