miktdish
Guns n Chainsaws
Could be a few things.
The thermostst may not be opening.
The EGT is high if the boost and fuel has been 'turned up' too far.
The viscous coupling on the fan isn't 'coupled' and the fan isn't 'cooling'.
The temperature sensor isn't telling you the truth or is possibly not matched to the temp gauge so the readings are not true.
When it gets to this high temp, how long does it stay that way ?
The thermostst may not be opening.
The EGT is high if the boost and fuel has been 'turned up' too far.
The viscous coupling on the fan isn't 'coupled' and the fan isn't 'cooling'.
The temperature sensor isn't telling you the truth or is possibly not matched to the temp gauge so the readings are not true.
When it gets to this high temp, how long does it stay that way ?
dag019
Well-Known Member
It should be very obvious if it is overheating not just form the gauge, there is usually a nice hot smell, and if you pop the bonnet everything is properly sizzling. is this the case when it is overheating for you?
I would start by checking the viscous fan as that is an easy test. next time it overheats turn the engine off and see if you can spin the fan buy hand. if you can the viscous joint has failed and will need replacing. when it gets hot the fan should be locked and unable to turn without turning the belt.
a second test would be to remove the thermostat and run like that seeing if you still get overheating. in this temperature ethe fact that you are running open circuit through the rad will not matter. you can also test the thermostat with a pan of water heating up on the hob with the thermostat in it and a thermometer. watch the stat and when it opens check the reading on the thermometer.
Everything else @miktdish has mentioned are good suggestion but the two above are the easiest and quickest to check as a starting point.
I would start by checking the viscous fan as that is an easy test. next time it overheats turn the engine off and see if you can spin the fan buy hand. if you can the viscous joint has failed and will need replacing. when it gets hot the fan should be locked and unable to turn without turning the belt.
a second test would be to remove the thermostat and run like that seeing if you still get overheating. in this temperature ethe fact that you are running open circuit through the rad will not matter. you can also test the thermostat with a pan of water heating up on the hob with the thermostat in it and a thermometer. watch the stat and when it opens check the reading on the thermometer.
Everything else @miktdish has mentioned are good suggestion but the two above are the easiest and quickest to check as a starting point.
Corfewoodsman
Active Member
If your engine is truly overheating then all of the above.
If not, check earth wires particularly from chassis to engine as loose or disconnected wire can cause false temperature readings
If not, check earth wires particularly from chassis to engine as loose or disconnected wire can cause false temperature readings
miktdish
Guns n Chainsaws
The OP (like many) came here asked a question/for advice, got it and never came back.
This one has done it twice, first in Dec 2020 and again on Sept 2 2024
Corfewoodsman
Active Member
I should have looked at the date
At least we all tried
