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Premium Member
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779 Posts
Discussion Starter · #1 ·
Hi all,

Been a bit quiet recently - lot going on!

Anyway i started having AYC lights coming on after a few minutes of driving, switching the engine off / on again resolved it. After a couple of days it didn't. On checking the fluid, it was low so i topped it up and it seemed well again for a few drives until the lights were back on and fluid low.

Now the lights come on almost straight away, and i am losing AYC fluid but i can't work out where. Me and my mechanic have had the car up on ramps, cleaned it up, ran it up at some speed and turned the wheels lock to lock but cannot see where it's coming from.

At a guess, i think there is air in the pump from wherever the leak is and it needs bleeding, but if the pump doesn't stay on i can't do it (unless i can get hold of the tool or drop it off to a specialist)

Are leaks common from anywhere in particular? The only thing we could find is a very slight dribble of AYC fluid coming out of a breather in the transfer box, but not enough to justify the amount of fluid i've been losing
 

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Premium Member
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22,023 Posts
Hi all,

Been a bit quiet recently - lot going on!

Anyway i started having AYC lights coming on after a few minutes of driving, switching the engine off / on again resolved it. After a couple of days it didn't. On checking the fluid, it was low so i topped it up and it seemed well again for a few drives until the lights were back on and fluid low.

Now the lights come on almost straight away, and i am losing AYC fluid but i can't work out where. Me and my mechanic have had the car up on ramps, cleaned it up, ran it up at some speed and turned the wheels lock to lock but cannot see where it's coming from.

At a guess, i think there is air in the pump from wherever the leak is and it needs bleeding, but if the pump doesn't stay on i can't do it (unless i can get hold of the tool or drop it off to a specialist)

Are leaks common from anywhere in particular? The only thing we could find is a very slight dribble of AYC fluid coming out of a breather in the transfer box, but not enough to justify the amount of fluid i've been losing
I'd say maybe worth getting it properly bled, but if you are sure it is AYC fluid out of the acd box, then i'd guess maybe the seal in the ACD unit has failed

Someone like clivew will know for sure if my theory is possible

but then if it is that, you have to ask why it happened, so would need to then check the acd pressure line isnt constantly applying pressure to the acd, which would then point to a solenoid failure too

Im only surmising as I had a similar issue recently on a tractor, which used hydraulic pressure to lock the diffs, the controlling solenoid leaked applying permanent pressure to the diff lock mechanism, eventually causing the seal in the rear axle in the diff to fail, forcing the hydraulic fluid into the rear axle then out of the breather

A simple tell-tale check could be to drop the transfer box oil out of the transfer box and check the volume, if its too much, it could be the ayc fluid has added to it

(all only thinking aloud ;) )

Stu
 

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Premium Member
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9,904 Posts
The "leak" is almost certainly fluid coming out of the top of the reservoir
There is fluid stored in an accumulator on the pump assembly, when pump stops fluid slowly returns to the reservoir

It is best to wait 30 min before checking the fluid level

:)
 

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Transmission Dynamics
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7,804 Posts
Your AYC fluid is definitely leaking into the transfer box oil, thus the oil leaking out of the transfer breather, due to it being overfull. It'll be leaking past the ACD piston seals, either inner or outer seal.
 
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