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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
Oil Cooler O Rings Td5
Morning all, can anyone shed any light on where the green O rings on the left of the picture should be fitted on the oil cooler assembly on a Td5? I have looked at all possibilities and there is nowhere obvious they should fit. The banjo bolts have Doughty type washers and the heat exchanger has a pair of fat o rings that fit flush against the body of the cooler. Help!

Thanks, Martin



Click image to enlarge

Last edited by Penfold_6290 on 2nd May 2025 7:57am. Edited 1 time in total
Post #1066796 2nd May 2025 7:24am
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
Additionally - there are no O rings like these on the old assembly that came out, that's why I'm confused.
Post #1066797 2nd May 2025 7:33am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5922
2006 Defender 110 Td5 USW Zermatt Silver
On this diagram I can see two used. Have you none on yours?



Click image to enlarge
Post #1066804 2nd May 2025 8:34am
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
Thanks for replying. When I unpacked the kit I was not sure what the green o rings were for so I meticulously disassembled the old cooler assembly to see if there was anything like that on the original set up. No such o rings exist in the old cooler and the new cooler is not significantly different in its construction.

The possible option is they squeeze between the heat exchanger and the casing but because of their size it would be hit and miss as to whether they’d actually seal because of their diameter and thickness.
Post #1066806 2nd May 2025 8:45am
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Dover mike



Member Since: 01 Aug 2023
Location: Dover kent
Posts: 30
England 2000 Defender 90 Td5 CSW Arrow Red
hi mate i was in the same place last night i could not find anywhere for them so have left them out i hope that's correct
Post #1066807 2nd May 2025 8:55am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5922
2006 Defender 110 Td5 USW Zermatt Silver
“ I ordered 2 O-rings part #ERR7098 which are green. I believe these go around the bolts that pull the cooler to the housing. Does anyone know the actual part number of the black O-rings that go inside the actual cooler that tend to flatten out over time? Thank you.
The parts diagram shows the part, but no number is listed. FCE37F18-B770-4A7E-A524-8DAAF3F69FC7.pngFCE37F18-B770-4A7E-A524-8DAAF3F69FC7.pngE5CB3BA3-B45A-46A3-ACAA-149827576B19.jpeg”

Here may be some info.

https://www.landyzone.co.uk/land-rover/td5...ir.313694/
Post #1066808 2nd May 2025 8:56am
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
Dover mike wrote:
hi mate i was in the same place last night i could not find anywhere for them so have left them out i hope that's correct


I was about to tear it all apart and against my better judgement fit the o rings against the black o rings which just feels totally wrong.

I won’t do that now, so if we fail we fail together!!!



Click image to enlarge
Post #1066810 2nd May 2025 9:15am
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
landy andy wrote:
“ I ordered 2 O-rings part #ERR7098 which are green. I believe these go around the bolts that pull the cooler to the housing. Does anyone know the actual part number of the black O-rings that go inside the actual cooler that tend to flatten out over time? Thank you.
The parts diagram shows the part, but no number is listed. FCE37F18-B770-4A7E-A524-8DAAF3F69FC7.pngFCE37F18-B770-4A7E-A524-8DAAF3F69FC7.pngE5CB3BA3-B45A-46A3-ACAA-149827576B19.jpeg”

Here may be some info.

https://www.landyzone.co.uk/land-rover/td5...ir.313694/


Hi, I don’t think they’re available on their own. I tried to make up a full kit from parts but the banjo bolts, Doughty washers and fat o rings proved hard to find so I went for the full kit including the new casting.
Post #1066811 2nd May 2025 9:18am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5958
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
As a side question, do all TD5's (10p.15p etc) have oil coolers? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1066815 2nd May 2025 9:37am
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
I’m pretty sure that all Td5s have oil coolers.
Post #1066816 2nd May 2025 9:54am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5958
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Cheers. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1066819 2nd May 2025 9:56am
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Tandy



Member Since: 14 May 2024
Location: WA State
Posts: 34
United States 
I did this job just last month.

You can replace the old rubber black o-rings with the new green o-rings. The color difference is just a different manufacturer. Don't combined them on top of each other. The ones I ordered were brown.

See this thread

https://www.defender2.net/forum/topic95201.html
Post #1067412 9th May 2025 9:56pm
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Tandy



Member Since: 14 May 2024
Location: WA State
Posts: 34
United States 

Click image to enlarge

Here's a picture before I ordered the new rubber rings. Remove the old black rubber o-rings with a small pick and replace with your new green rings. When you reinstall the housing, the green rings will compress properly.
Post #1067413 9th May 2025 10:00pm
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Penfold_6290



Member Since: 22 Sep 2021
Location: Dorset
Posts: 355
United Kingdom 2002 Defender 110 Td5 CSW Epsom Green
Thanks Tandy, what’s confusing is the new heat exchanger comes with o-rings already installed and the green rings are supplied loose with the Dowty washers and banjo bolts. The green o-rings don’t appear to be of a sufficient cross sectional area to form a seal between the heat exchanger and the housing.
Post #1067436 10th May 2025 12:56pm
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