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Home > Maintenance & Mods (L405) > 4.4 coolant pipe o-ring replacement pics

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fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1434

2015 Range Rover Autobiography SDV8 Aruba

4.4 coolant pipe o-ring replacement pics

So, I had a coolant leak in the 4.4 tdv8 which using UV dye I traced to coming from the large bore pipes where they connect into the thermostat at the front of the engine .... green arrow shows leak point:

So a bit of google-fu and on here, I found the o-rings are meant to be 45mm by 3.5 or 4mm. So I ordered a pack of viton seals from Simply bearings. I did order others from another supplier, but they've yet to appear ... so going to cancel that order. Viton because they have a better reputation for higher temps.

Then armed with a screwdriver, a dental pic to hook out the o-rings , some lovehoney lube (yes, really) and some socks, I set about the task.

1 - Drain the coolant ... actually, nah, I didn't bother ... I set out with the intention of pulling the pipe and letting it spill everywhere so instead :

First, the socks ... I tucked them into the space between the pipes and the V to stop coolant spilling down the V too much:

The pipes are held in place by clips which slide upwards with a screwdriver:

They will slide up and clip into an unlocked placed about 12mm up ...

But I highly recommend removing them completely, as they ping off and fall down into the engine area which is a pain.

Then pull the pipe off. Might need a bit of encouragement with a screwdriver to leverage, but they will come straight outwards, and coolant will leak everywhere ... oh dear, what a shame, I'll hose it down later to clean it. At which point the socks you put in earlier will do their job and keep the V clear.

Now, at this point, you'll be thinking " I thought the coolant was meant to be pink/orange ?" It is, but I added yellow UV dye to it, which appears to have changed its colour a fair amount ... plus I had been topping up a lot with water which diluted the pink/orange as well.

Now you can see inside the pipe. There are actually 2 o-rings in there. The first is a plastic wedge shaped ring which guides the pipe and matches the angled face of the connector of the thermostat, then behind that is the rubber o-ring.

Click image to enlarge

Hook out the rubber ring, and replace it with the new one ... you can see how the new one sits prouder and should seal better.

Click image to enlarge

Then break out the lube, lots of lube around the seal and on the connector, and push it home. Just remember that there is a little tab on the connector which aligns with the centre of the metal clip section ( arrowed below )

I had to push the pipe quite firmly to get it home. The new o-ring must be quite a tight fit around the connector. The lube definitely made a difference as I tried to force it in dry first ... definitely went in better after being lubed .... errr

Then do the same of the next pipe. Interestingly, this pipe came off very easily compared to the other... so much so, I even questioned myself on whether it had been on correctly in the first place which would explain why is may have been leaking.

You can see the old ring is quite flat compared with the new one:

Old:

New:

And lube and refit - job done:

Refill the coolant, and all should be well. £4 in seals versus £100 in pipe seems OK to me.

(unfortunately, I dont seem to be able to get the rear HVAC working now, but thats a different topic I think )

Lastly ... a comparison of the old and new rings side by side:

Click image to enlarge

V8 or else ...

8th May 2023 7:56pm

DrRob

Member Since: 16 Apr 2015
Location: Petersfield, Hampshire
Posts: 4327

2011 Range Rover Vogue SE TDV8 Buckingham Blue

Really good information 👍
Defo one for the Wiki 😎 Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
--------------------------------------------------

8th May 2023 8:46pm

knwatkins

Member Since: 11 Sep 2020
Location: Poole, Dorset
Posts: 772

2014 Range Rover Vogue SE SDV8 Corris Grey

Well done fisha

It's surprising how a bit lovehoney lube can help with a ring-job Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

8th May 2023 8:50pm

Tinman

Member Since: 22 Mar 2017
Location: kent
Posts: 1209

2017 Range Rover Autobiography SDV8 Silicon Silver

Thanks for the detailed description 2017 SDV8 4.4 silicon silver AB
2012 TDV8 4.4 Stornaway Grey AB
2011 TDV8 4.4 Buckingham Blue
2012 VW V6 3.0 Tougreg

9th May 2023 7:36am

Kot

Member Since: 10 Mar 2021
Location: broadland
Posts: 1293

Its a morning of rings and Knobs 2018 SE SDV8 4.4 Byron Blue

9th May 2023 7:40am

caymanblack

Member Since: 08 Dec 2015
Location: DEVON
Posts: 1159

2017 Range Rover Autobiography SDV8 Carpathian Grey

Great info , thanks for posting fisha.. overfinch modified

9th May 2023 8:44am

fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1434

You’re welcome. Managed to get the coolant system bled which was a real PITA, but got there eventually. V8 or else ...

9th May 2023 10:17am

Haylands

Member Since: 04 Mar 2014
Location: East Yorkshire
Posts: 8436

2014 Range Rover Autobiography SDV8 Loire Blue

Super writeup... Alas I won't be able to do it as I don't have any socks.... Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

9th May 2023 10:21am

caymanblack

Member Since: 08 Dec 2015
Location: DEVON
Posts: 1159

You could use some old knickers Pete? overfinch modified

9th May 2023 2:20pm

Gremlin500

Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1629

Kot wrote:
Its a morning of rings and Knobs

And LUBE, don’t forget lube!

“If it ain’t broke, don’t fix it” -where’s the fun in that?

9th May 2023 2:42pm

Merchy

Member Since: 14 Feb 2021
Location: North Wales
Posts: 1226

2006 Range Rover Vogue Td6 Zermatt Silver

As I was puzzled, I googled 'Lovehoney lube' Having been divorced and single for some years now, lets just say that it was an educating few minutes, which explained why that particular lube is not one of the many types stored in my garage

9th May 2023 3:22pm

fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1434

Lol. I’ve had it for years. Cause its water based it shouldn’t affect the coolant or internals. It’s been useful over the years for getting hoses to fit over pipes and things like that. It’s almost run out now, so I’m not sure how i will get it past the “what’s that you’ve bought for the car now?” budget filter of the wife ! V8 or else ...

9th May 2023 3:31pm

Merchy

Member Since: 14 Feb 2021
Location: North Wales
Posts: 1226

I forgot to add, nice write up Fisha Some nice skills and ingenuity there.

At least now I know what that website sells you will HAVE TO TELL THE BOSS when you order more to stay out of trouble, perhaps it could be wise to also peruse the electrical goods section for a gift for SHMBO at the same time, to keep the Boss happy...... BUT.....IMPORTANT......get good quality batteries, one would assume that the battery voltage required for good performance is as critical as it is for a FFRR

9th May 2023 6:01pm

Gremlin500

Member Since: 11 Mar 2022
Location: Newcastle, UK
Posts: 1629

Silicone grease is what you need to stay out of er, trouble.
It will not turn your rubber into snot.
Just don’t use it for the er, “other” purpose……. “If it ain’t broke, don’t fix it” -where’s the fun in that?

9th May 2023 9:02pm

Richie N

Member Since: 29 Dec 2023
Location: Kent
Posts: 360

2013 Range Rover Vogue SE SDV8 Baltic Blue

Nice write up. Where was the leak ? I’ve got coolant running down the bellhousing, could it be from those pipes? I think water is collecting in the V on mine, and then escaping out the back..

9th Mar 2024 8:22pm

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