Switch - oil pressure - thread size?

[Alan Drover]

None of the switches I've come across has the cut in pressure on them.
I wonder if after all PRC6387 would fit.

[Henrik]

Thanks, the PRC6387 might be the correct switch but unfortunately it doesn´t fit a M10 tread.
¨normal¨oil pressure should be fairly the same in old engines like these, some one said 7 bars (not sure if that is correct).

[Henrik]

further.....stumble across this one
https://embertonimperial.com/products/engine-oil-pressure-warning-switch-lucas-240526?variant=42309376377007

Still 3/8¨thread......

[Henrik]

https://embertonimperial.com/products/lucas-oil-pressure-switch-prc4404-prc6387?_pos=6&_sid=8e822af8e&_ss=r

And a M10 version.....naturally not std for my engine....but could it work? 0.5bar

[Alan Drover]

It states PRC4404/PRC6387 with an M10 thread but you said Henrik that a PRC6387 doesn't fit. Somewhat confusing. Are you 100% certain that it is an M10 thread you've got?
1 bar is 14 psi which makes 7 bar 98 psi. I think you mean 7 psi which is 0.5 bar which is the cut in pressure.
Unfortunately I don't have a Tdi parts list to see which switch is fitted to those engines.
On Friday 11th I'm going to look at a 2.25 scrap diesel engine for any salvageable bits. I'll take my T piece and PRC6387 switch to see what fits what .

[Serious Series]

Maybe worth getting yourself a set of thread guages.
https://www.ebay.co.uk/itm/304398122049?_skw=thread+guage+set&itmmeta=01J9TP0371HJ71RN0J2QP545MP&hash=item46df8abc41%3Ag%3A4iwAAOSw8iBlCK9M&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKm6O0fXExMysdm0Q61ebDnYzOhDwzQYFe8oFtX8y1FNVWvZuXlU9Kl5lBMGaMWy7lD%2B97w5C1DLDzuBN1eFLyY0yut7Yq59Z%2FtA4b1W8q8%2FveLszqeJODmitaddavd14J8S9KonuNSfB86jgCoWjesTI07Etu%2FhcM5L7Xu4wm%2BoQV0PxkymFQ1rWLliRIffpgZ%2B%2BccTORnChcz87ss3z%2Fu865yRvWm8CMPJ9tLTKjEzCdgJKEWmeaTsuDS8EXHQqQ0ZSMuURi1V9alSuTmejSWb6KSMEpuiiKfdFf242%2FmSzg%3D%3D%7Ctkp%3ABFBM0rOA1s5k&var=603443533001

[Henrik]

Tread gauges too be ordered!
The switch I got is the PRC6387, at least that what it says on the box....but it doesn´t fit the M10 thread. Maybe I got the wrong switch.....happend before.....
But to me it seems like the :
https://embertonimperial.com/products/lucas-oil-pressure-switch-prc4404-prc6387?_pos=6&_sid=8e822af8e&_ss=r
could do the job with M10x1 tread and a 0.5 bar cut.

[Alan Drover]

A parcel is arriving Friday. Depending on what time I may have to defer my trip to the diesel engine until Monday 14th.

[Alan Drover]

It seems that the diesel engine I'm going to look at Monday has a spin on oil filter conversion so I'm going to buy  the filter assembly. I don't know if it's a Land Rover assembly or an aftermarket one.

[Alan Drover]

I've now got the spin on filter adapter and it's a genuine Land Rover part ETC5347. It takes the PRC6387 pressure switch. My T piece doesn't fit.

[Wittsend]

Going off on a tangent - does this help or just confuse ....





 

[Alan Drover]

Looks almost identical to ETC5347. I'll leave mine as is, not too worried about getting a pressure gauge. I'll look into metric T pieces

[Alan Drover]

....and here's my genuine ETC5347 for comparison with a genuine ERR3340 filter (and a Britpart pressure switch PRC6387).

[Henrik]

once again THANKS!!!

[Alan Drover]

I've now cleaned the gasket face of the adapter. I reckon some idiot has used the mechanic's nightmare, silicone bathroom sealer, on it because it was rubbery. With the help of brake/clutch cleaner and a plastic scraper it's all gone.  I've just got to clean the oilways then I'll wrap it up to keep the crud out.