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Naks



Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2676
South Africa 2010 Defender 90 Puma 2.4 SW Alpine White
dgardel wrote:

P/N is IVECO 99489567

Click image to enlarge


thread resurrection

Where does the hose from the top of the cap lead to? --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged



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Post #1074628 3rd Sep 2025 8:13am
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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 1046
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
Just down to the ground I believe . 2017 L494 Range Rover Sport SVR
2008 2.4 110 Utility Station Wagon XS.
Post #1074632 3rd Sep 2025 8:56am
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3604
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
https://www.defender2.net/forum/topic44373.html 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #1074638 3rd Sep 2025 11:23am
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1316
France 2002 Defender 110 Td5 DCPU Chawton White
Regard wrote:
Sure it is not the cap?

These things start to leak every few thousand miles. Here in SA we have a "rule of thumb" that you should replace your cap every 10k km (+_ every 7000 miles). They are cheap (�7 odd per cap from dealers) so worth changing regularly!

Allisport makes a nice allu tank that replaces the standard one. The only issue I have with those is......how the heck do you see the coolant level?


You buy the one with the sight glass and level sensor which you wire up to a flashing LED on the your dash. Expensive but maybe cheaper than a new engine..
Post #1074639 3rd Sep 2025 11:24am
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1316
France 2002 Defender 110 Td5 DCPU Chawton White
BrickBox wrote:
Just down to the ground I believe .


On a series (2 1/4) there is no expansion tank, instead there is the cap on the radiator and a small pipe right below it such that the cap works are a non return valve. A small hose then goes into a atmospheric reservoir which is crutially connected to bottom.

The idea is that every time the engine cools the low pressure that is created sucks coolant from the reservoir into the radiator. Likewise when the engine heats up any access fluid is pushed out into the reservoir.

On a series, when you remove the cap it should always be full to the brim. If not this system is not working.

Would Iveco not have intended for this cap to work the same and therefor it's not really a direct replacement for the LR cap, which is just a pressure release valve on a pressurized expansion tank? Is there a pressure rating stated on the Iveco cap at all?
Post #1074641 3rd Sep 2025 11:34am
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Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 2495
United Kingdom 
Dinnu two posts above posted this link https://www.defender2.net/forum/topic44373.html

In the first post of that topic Dgardel states “4 months ago, working on my "monster" (the Mi.G not my Defender) noted that the cap of the expansion tank IVECO might be fine. Control excess pressure from 1.0 to 1.2 bar, perfect !!!! ”

So looks like the the pressure rating is 1 - 1.2 bar Thumbs Up
Post #1074647 3rd Sep 2025 1:17pm
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Siwynne



Member Since: 04 Nov 2016
Location: West lancs
Posts: 620
England 
That’s correct 1 - 1.2 bar. I have one of these purchased from an iveco dealership. They are from fairly old vans and getting harder to come by genuine ones. The parts guy was surprised I was putting on a defender.
Post #1074680 3rd Sep 2025 7:48pm
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 788
Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
Does this mean I have to buy a couple of spares now, just to be sure?

I have this cap and the AlliSport coolant tank with the sight glass. The sight glass makes it easier to ascertain the current coolant levels though I haven't worked out if I should keep the thing filled to the top fo the sight glass or not. No Better Friend, No Worse Enemy
Post #1074708 4th Sep 2025 9:11am
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