Hi all,

Does anyone know what the thread size/type is for no 4 cylinder is (the one nearest the turbo)? The block has an inspection hole with plug - I need to replace with plug with a special adaptor nut (threaded both external and internal) that will take an SPA oil gauge sensor and screw into the block in place of the plug.

Its a 2.5L block but I think they're all the same...new age or classic.

 

Not sure what the thread size the external thread on the gallery plug are to be honest.

But do check the what size your sender unit is (i.e. sensor) as some can be NPT or BSPT. And the original gallery plug is a NPT.

Hopefully one of the other guys will know.

 

I've got the sensor covered as supplier of adaptor or polo like "nut" already knows SPA gauge sensors, I just dont have thread gauges so cant confirm the block stuff...hopefully someone knows...

 

m18x1.5mm pitch.

I had a local hydraulics company press me a connecting tube assembly.
It consisted of a m18x1.5 plug, pressed onto that was 40cm of high pressure hose, the other end was 1/8npt female.
That way you have much more room/clearance, as the spot down there is quite cramped.
Also with the turbo beinig there I was concerned with the heat damaging the wires.

Edit.
I see that you want to fit a temperature sensor, then this doesn't work.
The hose has pressure, but not flow, thus temp readings are skewed.

What I normally do is just remove the standard pressure switch @ alternator, put the temp-sensor there.
then lenghten the wiring, and fit both the aftermarket gauge sensor, and the stock warning light to the nr4 cilinder.

 

Cheers for that top quality advice! All I can do is say thanks chap, spot on reply.