Freelander 1 How hot should an IRD get?

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Avocet1

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Did 200 miles today to visit a breaker and get me some doors and a wing and bumper for my write-off. (Ended up with a headlining as well)!

Anyway, on the way back, I stopped after about 75 miles to have a feel of the VCA. All good, barely body temperature. However, I noticed the front half of the propshaft was warm. As I felt my way along it, I noticed it was hotter and hotter. By the time I was at the front UJ, I could only just keep my hand on it. The IRD, however, was hotter still - too hot to touch. Is that normal? I'd been doing between 60 and 75 on a mixture of single and dual carriageways, not carrying much load.
 
The IRD has a 'cooler', this shares coolant with the engine, so it will always try to be as hot as the engine! In fact I seem to remember that the 'cooler' is there to bring the IRD up to temp quicker rather than cool it down, but I may be wrong.

Dunno what temp it would be without the cooler, but there's an awful lot of work going on in there and a lot of gears turning very rapidly.
 
GrumpyGel said:
The IRD has a 'cooler', this shares coolant with the engine, so it will always try to be as hot as the engine! In fact I seem to remember that the 'cooler' is there to bring the IRD up to temp quicker rather than cool it down, but I may be wrong.

Dunno what temp it would be without the cooler, but there's an awful lot of work going on in there and a lot of gears turning very rapidly.
Click to expand...
its a cooler and would get very hot on long journeys
 
Thanks both. That's reassuring. It felt like about the same temperature as the sump, just putting my hand near either of them - probably around 100 degrees, maybe a bit less. @GrumpyGel, I've come across that with oil-to-water engine oil coolers (that most of the time the cooler is actually a "warmer"). That's definitely to do with emissions performance, trying to get the engine up to temperature ASAP. It's the first time I've come across it with transmission components though, but I guess the same will apply, it'll eke another 0.00001 MPG (and corresponding reduction in CO2 emissions) out of it on the official emissions test drive cycle, I guess!
 
Avocet1 said:
Thanks both. That's reassuring. It felt like about the same temperature as the sump, just putting my hand near either of them - probably around 100 degrees, maybe a bit less. @GrumpyGel, I've come across that with oil-to-water engine oil coolers (that most of the time the cooler is actually a "warmer"). That's definitely to do with emissions performance, trying to get the engine up to temperature ASAP. It's the first time I've come across it with transmission components though, but I guess the same will apply, it'll eke another 0.00001 MPG (and corresponding reduction in CO2 emissions) out of it on the official emissions test drive cycle, I guess!
Click to expand...
theres usually a thermo switch in the cooler line so oil doesnt circulate till up to temp, tractors and slow moving vehicles use water cooled intercoolers, it seems odd a cooler should be using a hot coolant but like the radiator its supposed to remove excess energy not make oil cold
 
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