Hi all,
I’m looking for some factory confirmation on the oil pressure sensor thread.
I’ve seen 2 different thoughts so far:
Blocks for cars with warning light sensors had a 1/8 NPT tapered thread (27 tpi)
Blocks for cars with mechanical gauge had 1/8 BSP parallel thread (28 tpi)
The majority of the aftermarket mini sensors and fittings appear to be 1/8 NPT. This includes the t piece sold as “TP” from most mini shops and the adapter “OA”.
https://classicmotoring.net.au/oil-gaug ... e-adaptor/Attachment:
IMG_9906.jpeg
The part CAM6431 and original 2A269 have the parallel thread
Attachment:
IMG_9912.jpeg
I bought a T piece fitting from mini king many years ago which screws in fine but it’s the 1/8 NPT thread
The 850 parts manual has a sensor HYL2445 with washer 6K464 which suggests a parallel thread. I’ve checked on the old 850 engine under my bench and it has this setup
Attachment:
IMG_9910.jpeg
Or should I just use the NPT threaded adapter with some thread sealant and stop over thinking it? The NPT fitting hasn’t leaked so far. I’m currently using an 1100 van block from about 1970 which I’m assuming would have been a sensor light only