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Old 02-09-2015, 07:46 PM
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Re: Diesel Overland heating up towing 3 tonne caravan

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Originally Posted by Futuresystem View Post
Mine is NEVER under 97 C once warmed up.
And guess what, when you look at the specs,
that's about the temp at which the thermostat STARTS to open.

ie: the thermostat is only starting to open, not fully open, at 97 Celsius.
These engines do run hot, and are designed to do so (it improves fuel efficiency).

Synthetic oils will handle those temps no problem at all.
Whilst I worry about other things like DPF regens etc (haven't had any issues yet), engine running hot is not something I lose sleep over.

Cya
I hope you are correct. Yes the thermostat Opens at 98C (208F) and is Fully Open at 107c (225) and the new coolants apparently manage higher boiling points. The issue is that at the higher fuel flows and under load the thermostat quickly runs out of control range and there is insufficient cooling airflow to control the cooling system. Obviously this is the way it is these days for better fuel economy and reducing exhaust emissions. Strange that other manufactures haven't quite gone to these extremes. Seriously though, do you think 120C(248F) is acceptable if everything is OK?

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  #14  
Old 02-09-2015, 08:15 PM
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Re: Diesel Overland heating up towing 3 tonne caravan

Quote:
Originally Posted by Gustlock View Post
I hope you are correct. Yes the thermostat Opens at 98C (208F) and is Fully Open at 107c (225) and the new coolants apparently manage higher boiling points. The issue is that at the higher fuel flows and under load the thermostat quickly runs out of control range and there is insufficient cooling airflow to control the cooling system. Obviously this is the way it is these days for better fuel economy and reducing exhaust emissions. Strange that other manufactures haven't quite gone to these extremes. Seriously though, do you think 120C(248F) is acceptable if everything is OK?
Well, you and I are obviously used to engines running much cooler.
Having said that, I have seen close to 120C on my old Nissan Patrol, and it was still not quite boiling though how close I don't know, it has a lower pressure cooling system, must have been close!

Yes, the synthetic oils will handle such temperatures and more no problem whatsoever.
Will everything else? I hope so!


And although many people complain about the gauge being so active, not damped down and absolutely lying about engine temps like so many other makes, (like my mates Toyota Landcruiser or my wife's i30), I have yet to hear of even a single JGC diesel actually overheating (ie: boiling)!
Have you?

(My mate always used to brag about his LC having "a proper cooling system", and that the gauge never moved. So one day after climbing a range with the van on the back, I stuck a non contact IR thermometer on the engine cooling system outlet- boy did he get a shock! He hasn't said anything since!
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Old 02-09-2015, 09:44 PM
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Re: Diesel Overland heating up towing 3 tonne caravan

Thanks for your reply and I do understand about the temp guage on these Jeeps. I have my figures from the OBD11 scan. Yes you are correct about being use to cooler vehicle temperature indications but even my WH 2007 Jeep never looked like getting this hot towing the same van. It did however require an extra tranny cooler. These modern oils can handle the temps but as with the transmission oil also, operating at the upper end the life is considerably reduced. Unfortunately a few 14's have overheated with the EGR cooling transfer seals/hose blowing and dumping fluid. So the main issue to me in accepting the temp rising so rapidly that it's all Ok and don't miss what the guage could be telling me.
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