Measuring Oil temp.
Discussion
I know its been covered before and most people go for the sump bung, but is it possible to to replace the bung in the pic below with a temp sensor it has direct access to the oil gallery from the oil filter. This is a 4.0 serp engine. I am not sure what the bung replaces unless its there to blank off a hole that helps manufacturing.
As long as it is on gallery on teh sump side of the filter it should be OK. I prefer the idea of of that rather than the sump plug. ThinkAuto and ETB do a range of adapters for temp sensors.. Alternatively many of us have combined pressure / switch sensors so the switch can be replaced with a temp sensor.. Check if the unused connector on your pressure sensor works as a switch 
Using the location that is most protected will prevent the chilling experienced like the coolant temp sensor?
Dave
Using the location that is most protected will prevent the chilling experienced like the coolant temp sensor?Dave
spend said:
As long as it is on gallery on teh sump side of the filter it should be OK. I
Dave
I think that it is after the filter on the full presure side. I don't see that it makes a difference if the oil is a full pressure or not, or does it.Dave
Out of interest I assume that the oil is pumped from the sump through the center of the filter and then on round the engine.
It will get cooled in the filter & even more so if you add an oil cooler, so it makes more sense to choose a gallery 'on the way' to the filter. If you spin the filter off and you may be able to see how some of the galleries are connected, be careful its not the pressure relief valve
Dave
Dave
That bung pictured blanks the take off (or return, not know which) that Landrover use for the lines to the oil cooler (the other tap is where TVR put the pressure sensor).
Useful to know if you plan to add an oil cooler at a later date. Just taken the engine out of my Disco so can take some photos of the lines etc if it's of any use.
Regards
Iain
Useful to know if you plan to add an oil cooler at a later date. Just taken the engine out of my Disco so can take some photos of the lines etc if it's of any use.
Regards
Iain
Pink_Floyd said:
spend said:
Do you mean the coolant temp sensor?
Dave
Yes the coolant sensor, I was going to use it for oil temp sensor with a water temp gauge.Dave
But this wont be much use... an oil temp gauge needs to have a range from around 70 to 150C. Oil runs a good bit hotter than the water especially when you start to cane the engine (and that's the only time the temp gauge is of any value anyway). You'll need an appropriately calibrated and ranged sender and gauge im afraid. Chimjunkie said:
....... I am only interested in the point where the oil is up to temperature. ...
??? Why ??? Granted thrashing the engine with stone cold oil isnt a great idea, but you can tell when the temp comes up a bit from the fall in low rpm oil pressure, and normalisation of water temp.
IMHO the whole point of an OTG is to warn you if you are overheating the oil and risking the engine when under arduous conditions (really only an issue on track as road driving is very unlikely to provoke seriously high oil temps, say over 140C).
Just seems a bit pointless having a gauge which will just sit up against the stop as soon as you start to give it some, may also give a false sense of security??
Just resurrecting this as I've now moved my temp sender from the sump bung (where it was too close to the exhaust and a PIA come oil change time), to the location on the filter housing bung shown by the OP. First impression is that the guage moves an awful lot earlier (it now swiftly shows a few degrees before the coolant temp starts to come up), and the average running temp is significantly higher now (typically reading 95C now, compared to 65-70 when read from the sump). Interestingly (but perhaps logically when thought about), the reading is way steadier now when up to temp than in the sump bung location... here the reported temp was very variable (I guess reflecting the cooling of the sump by airflow). On balance I think this is a 'better' location as is should more accurately report the temperature of the fluid as it circulates (and this is clearly higher than the bulk temperature in the sump).
ETA (for anyone interested in these things), the oil temp is consistently 10-15 degrees higher than coolant in normal running, which is waht always surprised me before (ie that it wasn't the case). Guage inaccuracies accepted but you get the picture
ETA (for anyone interested in these things), the oil temp is consistently 10-15 degrees higher than coolant in normal running, which is waht always surprised me before (ie that it wasn't the case). Guage inaccuracies accepted but you get the picture
Edited by Pupp on Monday 11th August 13:23
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