Auto Gearbox Fluid Change Issue - Page 2

tricky1962 · 5th May 2024, 14:21

All fair points Simon, however, when the fluid was finally drained it was warm to the touch, but not hot. I estimate the temperature to have been between 30 & 35°C.

So if I understand you correctly, you think the idle speed was too high, hence ejecting the fluid from the level plug?

Matt_75 · 5th May 2024, 16:39

I did my ATF change about a week ago. I ran the car for about 2 minutes to get it on the ramps. Drained the oil and topped it up. Ran it for a further 15 seconds or so to empty the converter per the guide linked below. Topped it up again. I then used P-scan to watch the transmission fluid temperature and I was surprised how long it took to reach 35°C at idle. It took about 15 minutes.

https://www.the75andztclub.co.uk/for...d.php?t=124816

tricky1962 · 5th May 2024, 18:33

My trip around the block is up quite a steep hill initially so I wasn't surprised the fluid was warm.
Among other things, I work daily with liquids between 25 and 50°C so believe I am a reasonable judge of liquid temperatures in that range.
What I plan is to top up the fluid when I get my next lot delivered, run the car at idle on my drive until the coolant gets up to temperature (which could well take 15 mins), the idle speed drops and then check the level. I have a thermocouple so I can check the actual temp of the oil as it comes out.

5th May 2024, 16:39	#12
Matt_75 Gets stuck in 75 Saloon Join Date: Apr 2022 Location: North Somerset Posts: 573 Thanks: 13 Thanked 20 Times in 8 Posts	I did my ATF change about a week ago. I ran the car for about 2 minutes to get it on the ramps. Drained the oil and topped it up. Ran it for a further 15 seconds or so to empty the converter per the guide linked below. Topped it up again. I then used P-scan to watch the transmission fluid temperature and I was surprised how long it took to reach 35°C at idle. It took about 15 minutes. https://www.the75andztclub.co.uk/for...d.php?t=124816 __________________ Matt 2001 Rover 75 Connoisseur SE 2.5 (BRG) 1999 Rover 75 Club 2.5 (Dorchester Red) 1973 Triumph Dolomite (Honeysuckle)

5th May 2024, 14:21	#11
tricky1962 Newbie Rover 75 Tourer Join Date: Oct 2023 Location: Eastbourne Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	All fair points Simon, however, when the fluid was finally drained it was warm to the touch, but not hot. I estimate the temperature to have been between 30 & 35°C. So if I understand you correctly, you think the idle speed was too high, hence ejecting the fluid from the level plug?

5th May 2024, 18:33	#13
tricky1962 Newbie Rover 75 Tourer Join Date: Oct 2023 Location: Eastbourne Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	My trip around the block is up quite a steep hill initially so I wasn't surprised the fluid was warm. Among other things, I work daily with liquids between 25 and 50°C so believe I am a reasonable judge of liquid temperatures in that range. What I plan is to top up the fluid when I get my next lot delivered, run the car at idle on my drive until the coolant gets up to temperature (which could well take 15 mins), the idle speed drops and then check the level. I have a thermocouple so I can check the actual temp of the oil as it comes out.