Oil pump thread adapters

[The Original Tom]

Time to resurrect my old plans - I want to fit a pressure gauge as well as my warning light.
I've read that the warning lights are crap and come on at too low values.
I see that 1/8"BSF t-pieces are easy to come-across, so:

I'll need:
- an adapter to go from 1/2"UNF male (the hole in the oil pump housing) to 1/8"BSF female.
- a new oil pressure switch (1/8"BSF) that switches at a more sensible value - about 15psi? (suggestions?)
- Oil capillary hose with 1/8"BSF fittings at the ends (1 male, 1 female)

I'd like to be able to get these 3 things, plus a t-piece, from the same place to cut down on shipping costs.

Cheers
Tom.

[The Original Tom]

Or could I just get a 1/2"UNF banjo bolt and use the banjo connection to feed the gauge, whilst tapping the head of the bolt to accept the 1/2"UNF pressure switch?

[Ian Anderson]

Think Automotive in Twickenham always whad what we needed when building the 40

http://www.thinkauto.com/index.htm

Ian

[Paul B]

Think Automotive in Twickenham always whad what we needed when building the 40

http://www.thinkauto.com/index.htm

Ian

The biggest problem I have when doing this sort of job is working out what I've got, what I want to do, what gear is available, and what combination of all three is likely to work out with a satisfactory result.

[The Original Tom]

Tell me about it Paul - It's a nightmare trying to work out what I need, and even more so trying to articulate it to someone else in words via email!

Any way I've emailed Think Auto (cheers Ian) and I hope they understand what I'm after If not I'll have to end them a picture Mind you I suppose they get emails from all sorts

[Ian Anderson]

I'm close enough take in the parts and say connect this to that with 4 foot of pipe

They take the parts away to the back store and come back with the bits!

Ian

[The Original Tom]

It's alright for some...

[Paul B]

Tell me about it Paul - It's a nightmare trying to work out what I need, and even more so trying to articulate it to someone else in words via email!

Any way I've emailed Think Auto (cheers Ian) and I hope they understand what I'm after If not I'll have to end them a picture Mind you I suppose they get emails from all sorts

One tip, the 1/2" UNF thread in the pump is within a gnats cock of 1/4bspp, in case you need to fit something like that. A tap will run down it with minimal effort. I have done that with mine, as my oil pressure gauge came with 1/4 bspp fitting and i had a 1/4bspp plug in hand for the other hole.

(bspp = British Standard Pipe Parallel)

[IRG]

The warning light is typically 7 psi …………….. the spec is 5.8 – 10.2 psi.

There are 3 ports on the pump cover and all of these ports are connected together internally …………. Certainly on the RR 3.5 / 3.9 / early 4.6, two of the ports are threaded ½ UNF ……….. the other port is different and I don’t have that to hand right now, but its nothing special.

Screw the oil pressure switch into one port and ½ UNF to whatever adaptor in the other port ………….. no need for a T piece ……………….. you can also screw an oil temp sensor into the 3rd port. Adaptors from ½ UNF to NPT or BSP are available from Real Steel ……..

Here is a listing of the intermotor oil pressure switches ……(Rover OEM is intermotor – Part 50600)

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







Ian