Fendt engine oil temp

[Spotty Dog]

Fault code for engine oil temperature comes up regularly on my 63 reg 828. Fitted new sensor but still comes on . Engine coolant temperature is fine. Removed oil temp sensor and fitted a generic temp sender and a gauge in cab a a temporary measure. According to the gauge the oil temp is reaching 150deg C on heavy work, but radiator temp is only 90 deg (using a digital hand held thermometer).
Has anyone else had a similair problem or heard of this issue ?
Is it safe to drive with the engine oil that hot ?

 

[Deerefarmer]

Those engines always did seem to run fairly high oil temperatures yet if you're getting an error code obviously it is excessive... my mind goes to the engine oil cooler, perhaps a blockage or something playing up with it? Never had any issues with ours in that department tho.
You're probably filling it to the correct level on the dipstick with the proper oil I'm assuming.

 

[leone75]

Oil is usually about 30°+ hotter than the water in heavy work it could be blocked or dirty on the water side .
Is it only coming on when engine is working hard ?
There will be an oil cooler bypass.valve in the cooler.housing somewhere too maybe stuck open , or worst case scenario too much blowby heating the oil

 

[Pheasant Surprise]

150° C seems well bloody hot.

Where is the temperature sender in the oil circuit - is it before or after the oil cooler? If the temp sensor and wiring all check out OK, then your next stop would be the oil cooler.

 

[Timbo]

Oil cooler thermostat stuck closed.

 

[Spotty Dog]

150° C seems well bloody hot.

Where is the temperature sender in the oil circuit - is it before or after the oil cooler? If the temp sensor and wiring all check out OK, then your next stop would be the oil cooler.

Its next to the oil cooler but can't tell if its before or after.
I'm going to see dealer in the morning, thanks for the replies.

 

[Cowabunga]

I've no experience with Fendt but my air-cooled Same used to get up to those temperature levels and it did the oil no good. It broke down and needed changing very often indeed, like every 100 hours, or it would lose viscosity permanently.
The partial solution in its case was to place a male-male hydraulic union on top of the front oil cooler thermostat to permanently have it cooling as part of the circuit. It still got the oil very hot, but not THAT hot.

In theory you may have an injector timing or combustion problem that cause the pistons to overheat. Oil is sprayed up underneath the crown above the gudgeon pins to cool the combustion chambers [which is part of the pistons], so the heat is transferred from the piston to the oil. Excessive combustion heat inevitably heats the oil excessively and the oil cooling system may not have the spare capacity that the coolant system has to cope. It would be unusual for this to be an issue and the next stage on would be for a piston or pistons to actually melt. You don't want that! Think mega-big repair bill!

 

[Pheasant Surprise]

Hopefully it's just the cooler at fault. With a 60° C difference between water and oil temps, there's just too large a mismatch in temperatures.

 

[Spotty Dog]

Update on this, i took the oil cooler off the side of the engine and it was choked up with Radweld ! The tractor had radweld in the system when i bought it but i never really thought anything of it at the time but over a period of time it has slowly bunged up the water side of the oil cooler. Something i thought others should be aware of.
So i steam cleaned the oil cooler and flushed out the rest of the cooling system with clean water and now the oil temp never gets above 125 deg C.
Next issue is - why was Radweld used in the first place ?

 

[TripleSix]

Update on this, i took the oil cooler off the side of the engine and it was choked up with Radweld ! The tractor had radweld in the system when i bought it but i never really thought anything of it at the time but over a period of time it has slowly bunged up the water side of the oil cooler. Something i thought others should be aware of.
So i steam cleaned the oil cooler and flushed out the rest of the cooling system with clean water and now the oil temp never gets above 125 deg C.
Next issue is - why was Radweld used in the first place ?

I hate stuff like radweld.

People don't realise the other issues it causes.

It must've had a leak at some point.
Quite a new tractor to be using radweld on...

 

[Chuckie]

Update on this, i took the oil cooler off the side of the engine and it was choked up with Radweld ! The tractor had radweld in the system when i bought it but i never really thought anything of it at the time but over a period of time it has slowly bunged up the water side of the oil cooler. Something i thought others should be aware of.
So i steam cleaned the oil cooler and flushed out the rest of the cooling system with clean water and now the oil temp never gets above 125 deg C.
Next issue is - why was Radweld used in the first place ?

Are you sure it's radweld?

It could be the result of someone putting in the wrong type of anti freeze, certain types will react with each other and form a gel in tight spaces, I've seen i happen

Does the cab heater work?

 

[Zetor]

I’m impressed that the tractor monitors it’s engine oil temperature.

 

[Lincsman]

The oil isnt too full is it? A tx66 combine will show overheat due to high oil levels.

 

[Spotty Dog]

Well it just looked like radweld to me. Oil level spot on. The tractor has a sensor that puts an error code up when it hits a certain temperature. I have fitted a temperature gauge and separate sender to it myself just to monitor the actual temp while i try and resolve the issue.

 

[Pheasant Surprise]

Well it just looked like radweld to me. Oil level spot on. The tractor has a sensor that puts an error code up when it hits a certain temperature. I have fitted a temperature gauge and separate sender to it myself just to monitor the actual temp while i try and resolve the issue.

What colour of the rainbow is your coolant out of interest?

 

[Spotty Dog]

Shitty brown

 

[Pheasant Surprise]

Shitty brown

Doesn't sound like that's what it came from the factory with in late 2013/early 2014. Factory fill ethylene glycol was dyed dark blue. Don't use an OAT based coolant in there.