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zenman63

Member Since: 14 Nov 2021
Location: Warwickshire
Posts: 256

2018 Range Rover SVAutobiography 5.0 SC V8 Firenze Red

5L cooling tubes

My SV is using coolant about 1L in a 1000 miles.
No sign of any leaks so will use a leak detector dye.
Planning on changing all the plastic parts under the super charger for the aluminium parts.
Anyone on here done this?
63000 miles.

7th Sep 2025 5:02pm

Mikey

Member Since: 10 Jan 2008
Location: Dundee
Posts: 1875

Replace them for aluminium parts where possible

Y-piece, top pipe, coolant crossover pipes at the rear, oil cooler

7th Sep 2025 5:46pm

zenman63

Member Since: 14 Nov 2021
Location: Warwickshire
Posts: 256

Is it worth doing the water pump and connecting tube and belts.
Supercharger coupler and oil change?

7th Sep 2025 5:56pm

Inigo

Member Since: 15 Jan 2014
Location: Kent
Posts: 60

2019 Range Rover SVAutobiography 5.0 SC V8 Corris Grey

I'm slowly gathering parts for this. I have the genuine Y-piece and top pipe from the V8 Defender. Are the others available in aluminium from LR or are there only versions available from thrid parties? Suggestions from other forums are that the unofficial parts aren't particularly great fitting.

7th Sep 2025 8:13pm

zenman63

Member Since: 14 Nov 2021
Location: Warwickshire
Posts: 256

Interesting the defender went back to aluminium?

7th Sep 2025 8:33pm

Mikey

Member Since: 10 Jan 2008
Location: Dundee
Posts: 1875

Be prepared for there to be more wrong as you strip down

My 5.0 Sport spat it's water pump. So new pump and joining piece (and seals and gaskets) ready for a Saturday morning
Belts off, and the supercharger coupler had a load of play in it. So supercharger off. The symposer was a

to navigate around, so that was swiftly binned, and blanked off

Then a new oil cooler, and rear coolant pipes while your in there
New coupler fitted and a smaller supercharger pulley, because it'd be rude not to

Oil change in the supercharger too, because you may as well, while your in that far

Edit: wrong picture. That's just the symposer down the rear of the engine, and a single vacuum pipe (and a blanking plate not pictured) to remove the whole thing and make future maintenance much simpler

7th Sep 2025 8:50pm

zenman63

Member Since: 14 Nov 2021
Location: Warwickshire
Posts: 256

Well it’s very common apparently, and Land Rover have gone back to Aluminium.
Part numbers LR186859 upper crossover
LR186917 y pipe.
Just asking parts for availability.

8th Sep 2025 7:32pm

zenman63

Member Since: 14 Nov 2021
Location: Warwickshire
Posts: 256

Update on this as it’s now showing its ugly head.
UV dye showing no leak on engine even with a bore scope, possibly a tiny mist on engine all over so a new pressure cap for that.
However water on the drive now, drivers side rear.
So now need someone who has done this to quote on dropping the rear subframe etc and replace the tubes.

2nd Oct 2025 5:38pm

Boatmechanic

Member Since: 11 Dec 2019
Location: West coast
Posts: 95

Did it a couple of weeks ago

I bought an aftermarket kit with lots of stuff from the US, and did the replacement based on a crappy pair of YouTube videos. Service manual was not very helpful.

My original plastic pipes looked perfect after 90000 km, so I only replaced the front and rear crossovers and put the remaining parts aside. Wanted to avoid trying to fix what wasn’t broken.

Biggest pain was the stuff behind the supercharger. Second biggest was installing the supercharger.

Feel free to ask any questions.

4th Oct 2025 9:03pm

Mikey

Member Since: 10 Jan 2008
Location: Dundee
Posts: 1875

If you need to drop the rear subframe to replace those pipes, also consider doing the ARC + AC pipes at the same time...

5th Oct 2025 2:10pm

zenman63

Member Since: 14 Nov 2021
Location: Warwickshire
Posts: 256

Hi ,yes I will drop the subframe and the tank and change the rear pipes.
Looks like salt damage, way more than my old 16 plate 4.4.
I will try and get the tank guard hot galvanised as well.

5th Oct 2025 2:55pm

northernmonkeyjones

Member Since: 24 Mar 2012
Location: derby
Posts: 8785

2016 Range Rover Autobiography SDV8 Santorini Black

pretty sure that Craig did a thread on the rear AC line fix somewhere.... There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

5th Oct 2025 7:14pm

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