Thread: How hot is too hot?

What I've found with the TD5 is on a normal day (25deg ish) it will sit between 80-83 depending on traffic, throw in a decent hill and it's upto 87-89ish. I can hear the fan cut in at that temp and the engine temp drops rapidly back to 83. The thermostat is set for 83 as well I think and again I can usually tell that's kicked in.
When the ambient temp is hitting high 30's it only raises the normal operating temp by a couple of degrees.
I can also bring the temp down by slowing down and using a lower gear on the hills when towing, 5th gear at 80kph will get the temp close to the 90's no problem, drop it to 4th and it can drop temp by a good 5degs, guess more throttle equals more fuel equals running rich equals higher burn temp equals higher engine temp but I could be wrong.
My only concern with temp is gearbox, those suckers get ridiculously hot, already fitted extended t-box sump and fitting a better gearbox cooler soon.

John,
'Fenders dont run the A/C thermostats on the elbow such as discos.
Also really Phil is not running his diesel at 97 he is running the outside surface of the alloy head at 97... as mentioned if the OEM gauge is at 3/4 the actual coolant water temp is more like 110 maybe more.

Cooling system needs some loving IME

S

Originally Posted by roverrescue

John,
'Fenders dont run the A/C thermostats on the elbow such as discos.
Also really Phil is not running his diesel at 97 he is running the outside surface of the alloy head at 97... as mentioned if the OEM gauge is at 3/4 the actual coolant water temp is more like 110 maybe more.

Cooling system needs some loving IME

S

On my TD5 when the engine Guardian reads 83deg (fitted on the coolant pipe entering the head) the Nanocom is reading 87deg at the coolant sensor.
Also my gauge reads in the normal position (just under half) when its anywhere from 60degs to 90degs, I suppose this is to stop drivers being paranoid with the gauge going up and down al the time.

Originally Posted by roverrescue

John,
'Fenders dont run the A/C thermostats on the elbow such as discos.
Also really Phil is not running his diesel at 97 he is running the outside surface of the alloy head at 97... as mentioned if the OEM gauge is at 3/4 the actual coolant water temp is more like 110 maybe more.

Cooling system needs some loving IME

S

And a hole cut in the left guard

On my TD5 when the engine Guardian reads 83deg (fitted on the coolant pipe entering the head) the Nanocom is reading 87deg at the coolant sensor.

Ned, I assume those readings are when temps are stabilized about the thermostat temperature.

Now run the water temp quickly up to 115 and see how long the head bolt temp takes to reach 115
If your cooling system gets the funk one day you can test it. Especially if the water temp then drops as soon as you get over the hill, the actual head temp will not reach the peak that the coolant has.

S

Thanks to everyone for all the info and advice.

Sounds like the cooling system needs further looking at, I'm still trying to work out how to test the Viscous fan? I guess there is not a lot one can test with the water pump just replace it?

We are going on a trip to the Grampians and posible High country in a few days for 10 days so I guess it will get a good test then!

Will keep you posted of developments.

Have a jolly good Christmas and very happy New Year

Phil

Test the viscous coupling with a paint brush, not something like your hand, which will hurt (worse than that) or something less forgiving, which will damage the fan.

At temperature below the opening of the thermatic valve, or if the coupling is faulty, you will be able to stop the fan by holding the bristle of the paint brush against the spinning blade.

With a viscous coupling in good order, when the thermatic valve opens and the silicon has effectively "locked" the coupling the brush can't prevent the blade spinning.

Some viscous couplings can be repaired by re-filling with silicon.

Or like my old Rangie - drill a hole through and drop a bolt into it !!! -worked fine for the next 17 years


Martyn