Oil Pressure Switch

Could anyone help with a problem, I've got a series 3 with a 2.5na in it. The problem is that the clown that did the work replaced the original switch with the one in the pic below. Needless to say it's not very good at letting me know what the oil pressure is doing. What I need to know is what is the thread of the switch? The bolt they put in has chewed up the thread so it will need heli-coiling. I think it's an M10 of some sort but not sure which one. I cannot wait to find what else has been bodged. Thanks

I don't know but you could buy a switch and get the size off that?

Or someone might have a spare filter adapter lying around they might flog you cheap.

Getting a replacement may be the easiest route to be honest. I have bought a new pressure switch but all I can say is I think it is M10 I've ordered some thread gauges because I am fed up guessing threads. LOL The bolt they used isn't the same thread as the switch and I bet when they put it in it went tight after a few turns but numbnutz carried on tightening that fecker up!

Treat it to a lovely capillary gauge, that way you'll have real info on actual oil pressure [which you may not like!] stick with the oil light and it just tells you when it's to late! Also you can tap it to suit the "sender" or if that's to fu**ed to the next size adaptor - Durite probably your best bet, good luck

Thread is likely to be 1/8" NPT thread or if metric 10x1mm. Certainly not what looks like a 10x1.5 mm bolt shown in your piccy.

Already ahead of you on the capillary gauge so I will need a t-piece only problem is the threads. I had come the conclusion last night that it was probably m10x1 but I am waiting to get my thread gauges first. Getting the wrong size thread was getting a bit tedious, you wouldn't believe how many not quite right bolts I have around the place! I cannot wait to see what the inside of the engine is like!

LordOWar said:

Already ahead of you on the capillary gauge so I will need a t-piece only problem is the threads. I had come the conclusion last night that it was probably m10x1 but I am waiting to get my thread gauges first. Getting the wrong size thread was getting a bit tedious, you wouldn't believe how many not quite right bolts I have around the place! I cannot wait to see what the inside of the engine is like!

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If the switch has a copper washer sealing it,s base, will be straight 10x1 mm, if it has no washer it will be 1/8" NPT taper. Both are very similar in O/D, but NPT has 27 threads per inch and metric around 25 threads per inch.

I will measure later and see, but the switch has a washer so I think it is m10x1.