Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1928
LR3 V8 - replace thermostat housing complete - how difficult
I have a coolant leak and yesterday did some investigation. I had the idea of using a black light to see where the coolant was leaking.
I checked the orange LR coolant and it is in the perfect wavelength for my 385nm light - it glows increibly brightly.
Anyway, having removed the engine cover, I could see coolant splattered all over the front of the block. In the end I traced the leak to the thermostat housing. There is a tiny (invisible to the eye) crack at the top of the housing where the small hose joins at the top. The LR housing PN is LR005631. I'd like to think I only need to replace the top piece but can't see it separately. I suspect that the right thing to do is to replace the entire housing.
Has anyone got experience of this job and any advice? I suppose replacing the entire housing is the right thing to do, although it looks quite involved.
Here's the housing with the leak. The compromise in the housing is where the small house joins at the top smack in the centre of the photo.
PAGODA
7th May 2017 12:19 pm
Mogwyth
Member Since: 03 Oct 2014
Location: Pwllheli
Posts: 3976
Not sure how to get the whole off and there is nowt in the workshop manual. Think I would just replace the top section.==================================
05 D3 HSE V8 4.4
04 MG TF 135
03 MG TF 115 Cool Blue Edition
02 MG TF 160
00 Hymer B564 Lionheart
1971 Series III 109
7th May 2017 8:23 pm
Dr Jones
Member Since: 20 Feb 2012
Location: Pretoria
Posts: 56
I replaced only the top section, for the same reason. Just check the thermostat as it is made up of separate parts.
8th May 2017 9:06 am
pagoda
Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1928
Thanks. I've found just the top section from a seller in the US for $40 so will start here.PAGODA
9th May 2017 3:23 am
Alphamale
Member Since: 28 May 2014
Location: Belfast
Posts: 497
LRO05631 the complete housing, I think it also includes the stat and temp sender is available from Rimmer Bros price
£101.29. https://www.rimmerbros.co.uk/Item--i-LR005631. To fit you will need to get access to the bottom section that is attached to the top of the engine under the intake manifold.
9th May 2017 5:50 pm
pagoda
Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1928
Thanks. I've managed to find (I think) just the broken part (top part), which is complete with the thermostat. It should arrive tomorrow. If it is as described, and fits, it'll be quite a saving. Will update.PAGODA
10th May 2017 12:14 am
pagoda
Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1928
Finally got the replacement part. Fitted it in about 10 mins. Ran her up, bled the little bit of air out of the system and so far so good.
For others in this position here's the PN for just the thermostat housing. It comes complete with the thermostat and o-ring.
$40 and 10 mins to fit, vs about $120 and a good few hours for the complete housing.
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