Gentlemen, out there in T-Bar ether-land, your input would be appreciated.

The oil temperature gauge on my Abingdon has never moved off the left hand side of the dial, so I became accustomed to not knowing – and therefore not caring – about the oil temperature. For 25 years this was not a problem.

However, having - as many of you know – been through the trauma of trying to source a replacement VVC engine for the car which is now in deepest Texas I thought that maybe it was worth trying to have the oil temperature measuring system corrected, especially as the new engine was to be running in air temperatures of 95F and up.

Steps to date show that the circuit wiring is good all the way from the sensor connector to the indicator, so we know that it is a bad sensor.  

We tried the blue sensor off of the coolant side just to see what it would do and it lasted about 10 minutes before the gauge rose to very hot and the oil warning light (the one with the dripping oil can symbol) came on even though the oil was NOT overheating.

Using the advice given I looked up Rimmer and Brown & Gammon websites for part YCB100350, as being the right part for the replacement MEMS3 engine. Both sites said that this part had been superseded by part number YCB100420 – which is described as “coolant” and “water” temperature sensor, but NOT “oil” temperature sensor.  I ordered this part – it turned out to also be blue – and when it was fitted , it did exactly the same thing.

We took the single wire sensor off the old MEMS2 engine, plugged that one in just to see what would happen and it immediately swung the indicator to full hot, so that  sensor could be bad or is the wrong one. This sensor, we believe was brown.

Having started the search for a working oil temperature measuring system I am loathe to go back to having no idea as to what is going on with the oil.

Ideas please as to what to do next.

Thanks, Phil

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