Oil Coolers and Over cooling

phunk

The oil temperature sensor is in the pressure channels just off the oil filter. It is measuring oil temp of the oil that is entering the pressurized lubrication passages in the engine.

The only thing I cannot answer on the VHR specifically is if it is before or after the oil filter, because I have not taken the upper pan off and followed the oil passages in the upper pan casting. If it is before the oil filter, meaning just inline after the pump, then we are not able to see the immediate effects of the oil after leaving our aftermarket coolers. If it is after the oil filter, then we are seeing the immediate effects of our added coolers. I have an extra VHR engine sitting in my garage to use for my built engine project, sometime in the next few weeks when I take it apart to begin the build I can report back the answer to this.

But regardless of all that, the oil temperature sensor is definitely in the pressure channels after the pump.

Also, engines do not really have much of a return path for oil. The only passages for it are positioned near the cylinder head studs so that the oil can leave the cylinder heads and just drip back into the open crankcase down the sides. The upper oil pan itself, does not have any oil return passages.

Refer to service manual page LU-7. There you will read it instructing you to test engine oil pressure by removing the oil temp sensor and installing the nissan oil pressure test gauge hose. This is the only evidence I have at the moment of what I am saying... but it is clear evidence.

__________________