Outer Limits 4x4 Board

what temp would you expect the coolant to be at the top of the radiator ?

I would say very close if not over 100 degrees

my guage said 120 i hope its faulty but i think its right, how can you tell if your thermostat is not opening properly?

it shouldnt be 100 unless its overheating

i would suggest it should sit on about 90 degrees.

most thermostats open at around 87 degrees i believe

the book says to test a thermostat, pop it in a pot on the stiove with a thermometer, and bring the temp up, you will see it open should be at about 87 degrees, or whatever the spec for your thermostat is.

Are the thermo fans coming on? or did you use an engine driven fan

Stock Gen 3 program dosen't turn fans on till 101 degrees c as is common with most late model engine where maximum economy is being sought. Water under pressure dosen't boil at 100 degrees, add coolant and its as high as 115 degrees depending on pressure and coolant quantity.
120 is too hot, there are colder thermostats available but if not faulty won't be the cause of overheating, this should be accompanied by changing the program to activate the fans at a cooler temp. Check your gauge as at 120 deg C I'd be expecting water to be boiling out!

Cheers

Joel

120 sounds too hot, but I don't agree with the suggestion that over 100 is automatically too hot.

You need to measure it with a calibrated gauge to be sure there's a problem.

I agree with PGS 4WD above, don't bother with a different rated thermostat (but consider replacing the thermostat with another correct rated one). And find the underlying problem.

i have used the original 2.8 patrol radiator with twin EL FALCON thermo fans i had ther fans running from start up as it was the first drive, the temp didnt scream up it just kept getting higher at a steady rate. there was no steam escaping or any leaks. there was a lot of pressure on the top radiator hose.

i also didnt have the oxygen sensors in and the fuel quality wasnt great(maybe a bit of diesel in it), it has a mafless tune

If this is a new install make sure you have bled it 100%. Where is the sender?

Joel

air in the system i didnt turn the heater on fixed now all is good

nice matto, give us some pics man.

soon jonny, i blew up the alternator today can you replace the diode or is it new alternator time.
p.s it is fun to drive makes me smile

So you sure you've blown a diode? Yes you can replace the rectifier plate, especially if its a bosch. C'mon man it wasn't that long ago you had a trade. Good luck with the engineering side of it. At least that's one bonus of not living in Queensland.

How did ya exhaust manifolds turn out Matto.
Cheers
gouldy