Auto Gearbox Fluid Change Issue

tricky1962 · 5th May 2024, 11:45

Hi.
The gearbox was changing down unnecessarily downhill, only when cold so not knowing the service history, I decided to change the fluid first.

I drained the gearbox and got 3 litres of fluid out. Refilled with 3 litres of fresh, removed the level plug, started the engine and went through the gears as instructed. I looked underneath the car and it seemed the fluid was being pumped out under pressure. I let it run for a bit then stopped the engine. 3.5 litres of fluid had been pumped out.

I don't understand why the level plug should allow the fluid to come out under albeit low, pressure.

I'm going to put 3.5 litres back in for now and take it for a short drive, but does anyone have any ideas what's going on?

Thanks

5th May 2024, 11:45	#1
tricky1962 Newbie Rover 75 Tourer Join Date: Oct 2023 Location: Eastbourne Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	Auto Gearbox Fluid Change Issue Hi. The gearbox was changing down unnecessarily downhill, only when cold so not knowing the service history, I decided to change the fluid first. I drained the gearbox and got 3 litres of fluid out. Refilled with 3 litres of fresh, removed the level plug, started the engine and went through the gears as instructed. I looked underneath the car and it seemed the fluid was being pumped out under pressure. I let it run for a bit then stopped the engine. 3.5 litres of fluid had been pumped out. I don't understand why the level plug should allow the fluid to come out under albeit low, pressure. I'm going to put 3.5 litres back in for now and take it for a short drive, but does anyone have any ideas what's going on? Thanks Last edited by tricky1962; 5th May 2024 at 12:03..