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[Kevin Wood]

I understand but my servicer told me that engins that runs on petrol doesn't have radiator inside the gearbox. the only cool the ATF in main engine cooler (radiator). only diesel vehicles has the radiator inside the gearbox. So I have to change the main engine radiator.

For the Omega, there are no differences in the gearbox, diesel or petrol. Box is the same inside. ATF is always cooled in the rad

Later V6s have a separate radiator for the ATF just in front of the main rad. You can see the 2 ATF pipes crossing over the top of the coolant rad. on such models.

I would syringe some ATF out into a small glass jar and inspect it. If there is debris in it, it means a friction surface in the box has broken down, so the box is probably shot. You can also check for signs of liquid contamination. I would expect it to look milky if it has water in it. If it's just plain brown it's friction material from the box. Try dipping a hot nail into it and see if it sizzles (water boiling off).

I'm assuming that the ATF was replaced when the gearbox was changed, so if it's got badly contaminated in 24k miles it doesn't bode well for the condition of the gearbox, I'm afraid. :-/

Kevin

[clint omega]

I think when the g/box was changed they used the old g/box oil cutting costs it was done under warrenty

The funny thing is just prior to the gearbox playing up the missus drove it through some flood water and drowned the poor thing had to remove plugs and air intack etc to get the water out off it i wonder if it is thaty is the atf fluid somehow has got contaminated with water ??

[footloose]

Has the car got a sump guard If not when your missus drove it through the water it may have got into the gear selector switch. this happened to mine and i had to dismantle the swich and clean it out and dry off the plug and socket. there is a little pipe wich goes from the top of the swich up the cable inside the metal heat deflector where water can get into the switch rendering it pretty useless untill cleaned out.  Worth a try.

[clint omega]

No sump gaurd i will go right through the whole lot this weekend so i will let everyone know the out come

the more suggestions the better

thanks all

regards Clint

[Kevin Wood]

I think when the g/box was changed they used the old g/box oil cutting costs it was done under warrenty

The funny thing is just prior to the gearbox playing up the missus drove it through some flood water and drowned the poor thing had to remove plugs and air intack etc to get the water out off it i wonder if it is thaty is the atf fluid somehow has got contaminated with water ??

It's possible it's got into the selector switch - not unusual but it doesn't explain why it doesn't drive manually.

A few members have also had gearbox failures after driving through flood water before, though. I wonder if the breather pipe was left off the 'box when it was replaced, allowing water in? :-/

Kevin

[Andy H]

A few members have also had gearbox failures after driving through flood water before, though. I wonder if the breather pipe was left off the 'box when it was replaced, allowing water in? :-/

Kevin

On Land Rovers that are taken through water deep enough to cover the axles it is common for the axle breathers to be extended to somewhere above the water level. When the hot axle/differential gets immersed in cold water the air (and to a lesser extent oil) in the unit contracts and pulls in water otherwise. I imagine the gearbox could behave in a similar manner if the breather pipe was split or missing.