Oil temperature sensor

Hello everyone!

Merry Christmas! (It's a bit late, but no worries.)
After you helped me so much with my LDA problem, I have a new one:
Today, I propped up my mill and loosened the drain screw to check the oil temperature.
Screw in the power supply. Unfortunately, I had to find out that all the included adapters...
'They don't fit (they're probably using imperial measurements).'
Here's a picture of the sensor:
http://wald.heim.at/wienerwald/552252/oiltsens.JPG

The thread diameter is approximately 10.1 mm, so I immediately rejected the idea of drilling out the VW drain plug (M14*1).
I've also checked the characteristic curve, you can see it at the end of the page.
/viewtopic.php?t=4362&postdays=0&postorder=asc&highlight=%F6ltemperatur&start=24
damn similar - i.e., Conrad/Equus are compatible.
Has anyone here installed one of those oil pan drain plugs and can tell me if it has the same thread (I'm guessing)?
Could I buy an adapter for the C connector?

'Alternative would be something like an oil filter adapter.'
http://wald.heim.at/wienerwald/552252/filter.JPG
Does anyone know the characteristic curve of a VAG oil temperature sensor? It would be great if it fits.
I've already read the various posts about the donor position.
Regarding that: Doesn't it not matter? A certain operating temperature will be reached anyway, it's just that one is lower... If it's significantly higher --> That's bad (both at the filter and in the tub).

Finally, something else:
My (driver's side) fog light cover (with the radiator behind it) is completely solid. Shouldn't it have slots to allow air to reach the radiator? Or am I mistaken? Would it be beneficial to cut holes in it?

Sorry for all the questions, but a lot can happen on a day like this.

Greetings, Ruki.

PS: I connected the LDA to the AGR using Ulf's method --> it works great!

You have a Golf IV, and the original fog lights are supposed to be mounted above the headlights. The aftermarket fog lights that are designed to be mounted below should not be installed on any Golf with a turbocharger (TDI, GTI, 1.8T), especially because of the intercooler. They completely obstruct the intercooler.

Using an oil temperature sensor on the filter creates a problem related to the water-oil heat exchanger. Jan6K has written extensively about this.

Hi,

Yep, I have ))

The problem with the oil filter adapter is that you're measuring *behind* the oil/water separator. While your statement about the temperature is correct, in reality, you're not measuring the oil temperature anymore, but something else that is significantly influenced by the water temperature. However, there's already another display for that. Therefore, I would either go with the more complex option using a drain sensor, or directly use a self-made dipstick sensor -> instructions can be found in the technical articles.

Best regards,

Jan.

Hi!

"Where does it actually come from, this knowledge that the temperature is measured *after* the heat exchanger, and not at the inlet? Has anyone actually disassembled one to verify this, or is it based on assumptions? Personally, I would be more interested in measuring the temperature drop across the oil filter."

Best regards,
Sure, here is the translation of the text from German to English:

"Dirk"

Hi,

In another thread (link is in my article), someone tested this and measured significantly lower temperatures than what was later recorded directly in the oil pan. If the problem were only related to the inflow, this shouldn't have happened.

Furthermore, I believe I recall that the filter in question is located BETWEEN the water pump (WT) and the oil filter, and therefore, within the circuit, it's positioned behind the water pump.

Best regards,

Jan.

Hi!

I remember that thread from back then quite well; I followed it closely. Now, I've reread it and would like to "revive" it.

The strut you mentioned is designed in a similar way to the one shown in the exploded diagram from Ruki, at least for my 1.4 PD engine. Therefore, it's quite possible that the sensor is located near the entrance to the water tank, or am I mistaken?
In dem Thread ist außerdem noch die Rede davon, das die Öltemperatur selten über 98°C geht. Aber wenn man genau hinschaut, handelt es sich dabei NICHT um einen TDI, sondern "nur" um die 9A Maschine, was im Klartext der 2 Liter mit 136PS ist. Also ein Benziner. Und ich denke mal, das für diesen die Öltemp durchaus okay ist. Schließlich ist ja kein Lader da, der das Öl massiv heizt. Ob Unfortunately, I don't know if the 2-liter engine has a cylinder head cooling system.
Has anyone perhaps held the holder shown above and can provide more information about it? Unfortunately, neither my repair manual nor my two DIY books say anything about it .

See you later.
Sure, here is the translation of the text from German to English:

"Dirk"

Hi, I've just taken a closer look at that thing with AKTE, and I think I can rule out the possibility that it's related to incoming stock.
I've had a similar part from a 9A Passat before, well, not directly in my hand, but I did replace the original sensor on one, because that part leaks a significant amount of oil.
Since this is a return line, I'm certain of it because, as far as I know, the oil is pumped into the center of the round filter and exits outwards. The marked opening is located on the oil line that runs from the outside of the filter.

This raises the question for me: Many VWs, and likely other cars as well, have a kind of pressure relief valve on the filter. I mean, if someone forgets to change the filter and the pump can no longer overcome the back pressure, the oil flows through a bypass. How is this bypass opened? Mechanically? If it were a pressure sensor, it wouldn't make much sense in the return line, would it? It would have to be in the feed line to register the overpressure.

Hi,

For the sake of brevity, I would interpret the image, as Matthias does, to mean that the measurement is actually being taken at the WT (water table) level.

Furthermore, I believe that even a naturally aspirated gasoline engine can easily reach an oil temperature of over 100 degrees Celsius under full load, but I don't have any personal experience with that.

Best regards,

Jan.

Hello,

I'm now writing about the 1Z engine!

The central hole in the oil filter is the return line to the engine. The oil flow after the oil pump is as follows: the bypass valve, then the heat exchanger, and finally, the oil filter is flooded from its front surface. The oil pressure switch (0.9 bar) is located in the feed line before the heat exchanger. This should not be confused with the pressure relief valve, which is located on the pressure side of the oil pump.
There is barely enough space on this component to cut an M10x1 thread into the inlet hole to screw in the sensor, due to insufficient wall thickness and lack of a flat surface for the sealing ring. Therefore, the dipstick sensor is the most practical solution in this case.

best regards, robert

Hello again!

Okay, so it seems the issue with the oil filter is now sufficiently clarified, and it's probably not a good idea.

Can someone tell me what the characteristic curve of the VAG sensor is (or whether it's even an NTC thermistor)?
Does anyone know what kind of thread the Conrad/Equus dispenser has for connecting to the tub?
Perhaps something like the one in the photo?

@matthias
Das stört den Ladeluftkühler völlig.
That's exactly what I mean. The original lids with the 'grid' design are very solid. But what's the purpose of that nice air vent behind them?

Greetings and thank you for all the answers.
Ruki.

No, the grille is naturally permeable in all Golf models under normal conditions; what else would the LLK (low-pressure cooling system) be for?

Hi!

no, the grid is naturally permeable in every Golf under normal conditions; what else would the LLK (likely referring to a specific system or component) be for?

I've already discussed the issue with the grid with the workshop.
They say the lids are normally solid, but apparently they are then manually adjusted.
what was cut out (which, apparently, someone forgot to include).
Okay, I'm going to fire up my Dremel and fix this. My LLK will be so happy!

Hey, Ruki.
[/quote]

Hi!
I'd like to revisit this topic, bringing it back to Ruki's original question:
Can anyone provide me with the characteristic curve of the oil temperature sensor? Or at least some intermediate data points?
This is the sender with the VAG part number: 1H0919563.
This component (depending on the configuration) was installed in almost all 4-cylinder engines, from the Bora, Caddy, Golf 3, 4, etc., to the vans. IF anyone has a repair manual that covers this topic, I would be very grateful for an excerpt.

Have a good evening.
Sure, here is the translation of the text from German to English:

"Dirk"

Hi!
I'd like to revisit this topic, bringing it back to Ruki's original question:
Can anyone provide me with the characteristic curve of the oil temperature sensor? Or at least some intermediate data points?
This is the sender with the VAG part number: 1H0919563.
This component (depending on the configuration) was installed in almost all 4-cylinder engines, from the Bora, Caddy, Golf 3, 4, etc., to the vans. IF anyone has a repair manual that covers this topic, I would be very grateful for an excerpt.

Have a good evening.
Dirk

Hi Dirk,
If you still need the data, here's the characteristic curve. You can also have the Excel file.

I hope this helps you.

Regards,
Maik.

Here's the Excel file.

Regards,
Maik.

uiii...fein, das da noch jemand an mich gedacht hat! Hat sich aber derweil erledigt. Aber vielleicht greif ichs trotzdem nochmal irgendwann auf. "Thank you very much!!!"
Sure, here is the translation of the text from German to English:

"Dirk"