Home > Technical > PEL500110, too cold? |
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Marks Landy Member Since: 09 Feb 2015 Location: Cheshire Posts: 299 |
As long as you bled the air out the system I wouldn’t worry.
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15th Jul 2019 11:29am |
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o4dn Member Since: 08 Jan 2010 Location: South West Posts: 545 |
Oh sure, we followed the WSM procedure to the letter and it worked well, so I reckon it's bled correctly.
It's more the temperature that worries me... I mean, for sure, I knew installing the PEL500110 which opens at 82°C instead of 88°C previously would result in a lower running temperature, that was the goal, but that's a lot colder than I was expecting... “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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15th Jul 2019 12:18pm |
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dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
PEL500110
82°C, soft spring rate. This is the PRT usually suggested for retro conversions on MGFs and pre-2003 MG TFs. Specifications and additional product information Discovery 2 - All 2.5L TD5 diesel engine models from (VIN) 5A476243 on - Quantity Required - 1 Freelander 1 - All 1.8L petrol engine models from (VIN) 1A000001 on - Quantity Required - 1 PEM100990 is a PRT (pressure release thermostat) for a MGTF LE500. 87°C, medium spring rate. Defender 2007 on Thermostats- All 2.5L TD5 diesel engine models defender |
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15th Jul 2019 12:31pm |
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o4dn Member Since: 08 Jan 2010 Location: South West Posts: 545 |
@dorsetsmith, I'm not sure I'm following, you mean PEM100990 would be for the Puma and PEL500110 for a Discovery TD5? “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
-- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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15th Jul 2019 1:11pm |
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dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
yes
PEM100990 Puma 07 to 2016 and defender TD5 1998 to 2006 PEL500110 Discovery 2 - All 2.5L TD5 diesel engine models from (VIN) 5A476243 on - Freelander 1 - All 1.8L petrol engine models from (VIN) 1A000001 on - |
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15th Jul 2019 3:49pm |
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o4dn Member Since: 08 Jan 2010 Location: South West Posts: 545 |
Right, that's the point, several people on here have changed the original PEM100990 for a PEL500110 to get lower temperature, but I am surprised that it gets that much lower “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
-- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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15th Jul 2019 4:55pm |
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Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 732 |
I am not sure you have the science correct. A thermostat merely operates at a fixed temperature. It cannot lower the temperature in a system. The opening temperature determines the speed of raising the temperature to a fixed point after which the mechanical heat will determine the final temperature. As long as the mechanical heat exceeds the opening temperature of the thermostat then it is this final heat which you will measure.
So as your final temperature exceeds the thermostat opening temperature the measured heat is determined by the cooling capacity of the system (i.e the radiator etc) I would suggest that the fact you have changed fluids is the reason there is a difference in temperature, not the thermostat. By using a lower opening temperature thermostat you will delay the warming up period of the engine as coolant will reach the radiator sooner ( especially in winter). However the final temperature will not change due to the thermostat as your engine temperature exceeds the opening temp of the thermostat. Probably opened a can of worms here. |
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15th Jul 2019 5:27pm |
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o4dn Member Since: 08 Jan 2010 Location: South West Posts: 545 |
Oh sure, the maximum cooling capacity of the entire system does not depend on the thermostat, however the thermostat regulates the running temperature under normal circumstances.
Anyway, I found out the old thread, it was https://www.defender2.net/forum/topic32086.html Looks like my observation are in line with others, so I guess this is expected “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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15th Jul 2019 5:53pm |
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Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 732 |
The other scenario is that the old thermostat was sticking partially closed, which would result in the temperature being higher due to lack of cooling by the radiator.
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15th Jul 2019 5:56pm |
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BrickBox Member Since: 05 Oct 2021 Location: Wales Posts: 838 |
Evening bump on this thread. When you have swapped to the cooler running thermostat, which one did you buy? Genuine one only, or are other brands sufficient? 2008 2.4 110 Utility Station Wagon XS.
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28th Aug 2023 5:34pm |
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TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1086 |
Personally I would go genuine on this and the right part number for the application.
Perfectly affordable and just as stated in this thread the actual temperature rating is important and colder is NOT better even in warmer climate, so best to go with what Landrover considered to be the correct temperature. If a system overheats there is not enough capacity to cool. Unless of course the thermostat is broken fitting a cooler thermostat is not going to make any difference. Engines that run too cool don't have optimal lubrication and or combustion. Capital punishment should be reserved for those mechanics that remove thermostats (not possible in most LR applications). |
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28th Aug 2023 7:14pm |
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BrickBox Member Since: 05 Oct 2021 Location: Wales Posts: 838 |
Brilliant- thank you.
It’s just a bit of evening reading and learning. I’m not looking to purchase a thermostat right now. 2008 2.4 110 Utility Station Wagon XS. |
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28th Aug 2023 7:23pm |
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3425 |
And old thread, but worth mentioning
Not familiar with the Freelander, but on the Rovers with the K series engines, the thermostat was on the radiator outlet / engine inlet, so might also be one of the reasons why the opening temperature of the thermostat had to be lower. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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28th Aug 2023 7:23pm |
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