Hi guys!
I decided to check the fluid level and color of the automatic transmission. So we followed the procedure by bringing the temperature of the oil pan to 35 ° C, selecting all the gears, put the car on the lift and opened the filler plug. a half glass of red fluid and no particular odors came out immediately. Apparently the level was too high. The next day I put the car on the lift and opened the filler plug immediately without giving the fluid time to reach operating temperature. A bit of fluid still came out ... This makes me think that the level was really too high and maybe it still is in my transmission. But I wonder: how is it possible that the gearbox has been overfilled so much? How was it possible to introduce more oil than the pan can contain at the room temperature of my garage (approx 10 ° C)? Could it be that the fluid introduced at the time has subsequently degraded and increased in volume? Not knowing what happened and when was the last fluid change, do you advise me to do a full flush?

 

You need to think viscosity. If you fill up a cold car with cold fluid, you can overfill quite a bit. How accurately did you measure the temp? Another possibility is refilling with the car at an angle somehow. Also, it is possible to introduce additional fluid through the cooling lines at the radiator. I believe there are transmission flush procedures out there, made with specialty equipment, that flush and refill the trans through those lines. Maybe it resulted in extra fluid somehow. Last, I believe a transmission that is overfilled can lead to the fluid being aerated somehow and therefore occupy more volume.

To your question, it is hard to argue against a proper maintenance procedure, but the fact that the fluid does not have that burned smell is a good sign.

 

I measured the temperature of the sump with a laboratory infrared thermometer. Now I don't know what the difference could be between the sump and the oil inside ...

 

This was taken during a forum meeting at Mackie Automatic Transmissions Ltd in Glasgow, Scotland. It shows the machine and procedure for flushing through the transmiision lines:




The hot fluid is drained and the system flushed through with heated fluid until the fluid is clean.

This is the post I made detailing the visit:
https://www.jaguarforums.com/forum/j...ssions-114845/

Mackie Automatic Transmissions Ltd are one of the best specialists in the UK and many Jaguar (and other marque) Dealers use them for rebuilds.

Graham

 

If the fluid is red it has already been changed as the factory fluid is gold color. I believe others have suggested up to a 5 deg difference between the pan and fluid. I use a infrared thermometer but target the fluid stream as it leaves the fill port.

 

working with the flushing machine connecting to the pipes that go to the radiator is just what I will be doing next week at my beloved London Taxi. Unfortunately the radiator was corroded on the inside and it happened that suddenly the cooling and the autobox fluids were inexorably mixed in a frightening pink emulsion (look pic after removing the sump)


Now I have changed the radiator and washed the cooling circuit while they told me that for the transmission it is essential to work with that machine.