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Oil Pressure switch V8 - Info anyone ?


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*some* are a different thread, something like 1/8BSP from memory which (after a desperate rummage through Halfords box of switches on a Sunday PM) turns out to be the same as a Toyota something or other... the size difference is obvious though.

Real Steel and Think Automotive do "early warning" switches that come on at a more sensible pressure to give you a real "uh-oh" light instead of "oh b*gg*r" like the normal one, the only catch is they will flicker at idle.

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This thread size has been discussed more than once on here. Then the opinion was 1/8 BSP. That is also the information I find in a certain go faster catalogue.

You can buy 25 lb oil pressure warning light sender units I do know. Most likely you can buy others as well.

I set the warning light on my oil pressure gauge to 15lb.

mike

YES !! It is a free country. As long as you do as you are told.

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1/8" BSP is what mopst engines use.

However the V8 being american doesnt! As rob says 1/2" UNF is the correct size if you're using the origional oil filter housing. The one on my remote kit for example is back to the BSP sizing again!

Cheers

Jon

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The 2 gauge/switch ports in the oil pump base are 1/2" UNF - I wasnt aware there are any different (BSP) models.

Even if you fit a flotech remote kit (as i have) it doesnt change, it still 1/2 UNF.

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The Rover oil pressure switch is ½ inch UNF with a spanner size of 22mm. The quoted pressure rating is 5.8 – 10.2 psi (nominal 7psi). These fail with monotonous regularity – even the OEM which IIRC is intermotor....part number 50600 (see below)

Here are the complete range of oil pressure switches

Part No. A/F Size Thread Pressure ( p.s.i.)

51150 24 1/8" BSP Taper 0.7-2.2

50820 22 1/8" BSP Taper 2.2-3.6

51140 22 1/8" BSP Taper 3.0-5.0

50750 22 1/8" BSP Taper 3.0-5.0

51100 22 1/8" BSP Taper 3.0-6.0

51110 22 1/8" BSP Taper 3.0-6.0

50740 22 1/8" BSP Taper 3.0-6.0

50810 22 1/8" BSP Taper 3.0-6.0

50700 22 1/8" BSP Taper 4.5-7.5

50800 22 1/8" BSP Taper 4.5-7.5

51196 24 1/8" x 27 NPTF 1.26-3.25

51010 22 1/8" x 27 NPTF 2.0-5.0 N.O.C.

51011 22 1/8" x 27 NPTF 2.9-7.3 N.O.C.

51000 22 1/8" x 27 NPTF 3.0-5.0

50620 13 1/8" x 27 NPTF 3.0-5.0

50530 22 1/8" x 27 NPTF 4.4-8.7

50540 22 1/8" x 27 NPTF 4.5-7.5

51060 22 1/8" x 27 NPTF 4.5-7.5

50670 22 1/8" x 27 NPTF 4.5-7.5 N.O.C.

50500 22 1/8" x 27 NPTF 5.8-10.2 - Standard sprite

51020 24 1/8" x 27 NPTF 6.5-8.5 N.O.C.

50650 22 1/8" x 27 NPTF 6.5-10.0 N.O.C.

50630 13 1/8" x 27 NPTF 10.0-13.0

50610 25.4 1/4" x 18 NPTF 2.0-8.0

50850 22 1/4" x 18 NPTF 2.9-5.1

50590 22 1/4" x 18 NPTF 2.9-8.7

51050 22 1/4" x 18 NPTF 3.0-5.0

50690 22 1/4" x 18 NPTF 4.5-7.5

51190 22 1/4" x 18 NPTF 7.5-11.9

50510 22 1/4" x 19 NPTF 2.9-5.1

50520 22 3/8" BSF 6.1-10.2

50680 22 3/8" BSF 17.4-29.0

50611 22 1/2" UNF 3.0-5.0

51170 22+18 1/2" UNF 4.5-7.5

50600 22 1/2" UNF 5.8-10.2

50950 22 M10 x 1 2.2-6.5

51031 22 M10 x 1 5.8-10.2 N.O.C.

50660 22+15.8 M10 x 1 7.5-10.0

50760 22 M10 x 1 7.5-10.0

51030 22 M10 x 1 17.4-23.2 N.O.C.

50970 22 M10 x 1 23.0-29.0 N.O.C

50960 22 M10 x 1 Taper 2.2-6.5

51197 24 M10 x 1 Taper 4.25-6.25

50550 22 M10 x 1 Taper 4.4-8.7

51015 22 M10 x 1 Taper 4.4-8.7

50710 22 M10 x 1 Taper 4.4-8.7

50951 24 M10 x 1 Taper 4.4-8.7

51040 22 M10 x 1 Taper 23.0-29.0 N.O.C.

50720 22 M12 x 1.5 0.7-2.2

50570 22 M12 x 1.5 2.9-7.3

50730 22 M12 x 1.5 2.9-7.5

50725 24 M12 x 1.5 4.25-6.25

50910 22 M12 x 1.5 5.5-8.5

50770 22 M12 x 1.5 6.0-8.0

50780 22 M12 x 1.5 7.5-10.0

50790 22 M12 x 1.5 7.5-10.0

50830 22 M12 x 1.5 7.5-10.0

51195 24 M12 x 1.5 Taper 4.25-6.25

50890 22 M12 x 1.5 Taper 5.8-10.2

50900 22 M12 x 1.5 Taper 7.5-11.5

51131 21 M14 x 1.5 2.0-4.0

50985 21 M14 x 1.5 2.0-4.0

50980 22 M14 x 1.5 2.2-3.6

50990 21 M14 x 1.5 3.5-6.5

50721 24 M14 x 1.5 3.5-6.5

51133 21 M14 x 1.5 4.25-6 25

50930 22 M14 x 1.5 4.4-8.0

50935 22 M14 x 1.5 4.4-8.0

50840 22 M14 x 1.5 4.5-7.5

50860 24 M14 x 1.5 5.8-8.7

50560 22 M14 x 1.5 7.3-11.6

50880 22 M14 x 1.5 8.0-11.0

51134 21 M14 x 1.5 28.0-32.0

50870 22 M16 x 1.5 5.8-10.2

50871 21 M16 x 1.5 5.8-10.2

50875 21 M16 x 1.5 10.5-14.5

51130 21 M18 x 1.5 4.25-6.25

51132 21 M18 x 1.5 4.25-6.25

50861 21 M18 x 1.5 6.0-8.0

50941 23 M18 x 1.5 8.0-10.0

50920 23 M18 x 1.5 8.5-11.5

50940 23 M18 x 1.5 8.5-11.5

:)

Ian

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mmgemini - UNF is an american thread.

SD1 timing cover.

ports.jpg

1. 1/4 BSP (parallel)

2. 1/4 NPTF (tapered)

3. not sure but measured to be 9/16 UNF (parallel).

Are you sure?

BSP & NPTF on the same unit?!

1/2 UNF has a dia of 12.70mm whereas 1/4 BSP has 13.16 - very easy to mistake.

1/2 UNF 20 tpi, 1/4 BSP 19 TPI, also very easy to mistake.

I can say with 100% certianty that my V8 pump base & the replacement flotec the threads 1 & 2 in your picture are 1/2 UNF.

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mmgemini - UNF is an american thread.

Are you sure?

BSP & NPTF on the same unit?!

1/2 UNF has a dia of 12.70mm whereas 1/4 BSP has 13.16 - very easy to mistake.

1/2 UNF 20 tpi, 1/4 BSP 19 TPI, also very easy to mistake.

I can say with 100% certianty that my V8 pump base & the replacement flotec the threads 1 & 2 in your picture are 1/2 UNF.

no I am not sure. All I know is that I took senders off my P6 cover and tried to fit them into the ports shown on the SD1 cover above. One would fit in one but not the other implying the ports are tapped to different threads. Measuring the senders' diameter and thread count seemed to show them to be as stated above. I vaguelly recollect buying RR pressure switch from paddocks that did not fit so had to buy one from local car part place.

I would be surprised if the threads are cast but would guess they are tapped for a particular application; a lot of oil fittings in UK in olden days used BSP and I have seen a few senders using NPTF so I did not think the mix of thread was unusual.

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ANF is an American thread. American National Fine

UNF is a european thread. Unified National Fine. Well that's what I was told when we went from BSW and BSF to UNF.

ANF was fitted to American vehicles that were Lend Lease that I worked on.

Old man Whitworth must be turning in his grave with more threads about now than every village in England had when he introduced Whitworth.

mike

YES it is a free country. As long as you do as you are told.

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ANF is an American thread. American National Fine

UNF is a european thread. Unified National Fine. Well that's what I was told when we went from BSW and BSF to UNF.

ANF was fitted to American vehicles that were Lend Lease that I worked on.

Old man Whitworth must be turning in his grave with more threads about now than every village in England had when he introduced Whitworth.

mike

YES it is a free country. As long as you do as you are told.

thats not quite correct, UNF was never a 'european' thread and not a common UK one. read the holy wiki text.

it was joint american/UK std, but never widely taken up this side of the pond.

link

ANF i have never heard of. unless its called something else now

not on this excellent webpage: link

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Sorry to be pedantic Mike but the unified series is NOT a European thread ………… ;)

It dates back to WWII ……………….there were vast problems in the manufacture and repair of aircraft engines, mainly because we all used different thread forms …. The Brits with BSF & BSW and the yanks with NC & NF……..

Because of the problems that thread differences were causing between the allied nations, in 1947 Britain, Canada, and the USA got together and agreed the Unified National thread form (commonly known as UNF, UNC, UNEF,& UNS). The Unified National series replaced the old American National series (ANF, ANC Etc) and also the USS, USF, & SAE…………..for all practical purposes in terms of fit, UNF & UNC are the same as the now long expired ANF & ANC.

UNEF (Extra Fine) and UNS (special) were new boys on the block in 1948 ……. Also UNR & UNJ were later spawned from this standard ……… although these thread forms are quite a bit different.

Interestingly the deal was one of compromises ……….. the Brits accepted a 60degree thread angle and the yanks had to accept rounded thread roots …………… :rolleyes: .

Yes I know …………. I’m sad ………….. much of the above info can be found in Machineries handbook (the engineers bible)………..and also from my father who was there at the time…….

:)

Ian

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Not to worry Ian. It's good to discuss our different knowelege or lack of on a forum. During WW11 the UK was Europe.

Also we let the Yanks have the fine while they let us have the coarse threads.

Do you know that all cameras had the tripod screw as 1/4 Whit until recently when it was changed to UNC.

When dod the Whit head bol/nut change to the smaller size? Do you know..

Also when SAE Metric came out in the UK it was different to French Metric.

Would you like to talk abouty BA threads :lol:

mike

YES It is a free country. As long as you do what you are told.

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