Any ideas as to what this is??

**Dinty** · 7th February 2008, 11:35 AM

G'day All, I'm at a total loss as to a particular part on a Series 3 diesel engine. It is situated down on the engine oil filter assy, the same block has a oil pressure warning light, electric oil pressure sensor and this other thing with 2 wires coming out of the top. It is approx 40mm in dia and roughly the same in depth, it must have engine going into it because it's on the same gallery, I will post a pic to Phoenix and hopefully he will put it up so as to help with it's id and what function it does, as at present my electric oil pressure gauge won't work on the engine, but put it across a battery and it works, the engine is a 5 main bearing diesel, anyway cheers Dennis

PS Does anyone have a circuit diagram for a late model Series 3 Diesel that will show how the electric oil pressure gauge is wired in??

**Blknight.aus** · 7th February 2008, 11:42 AM

sounds like it might be an oil temp sender...

**Phoenix** · 7th February 2008, 11:45 AM

The pic from dennis. No idea myself!

Oil pressure sw and mystery object 002.jpg

**JDNSW** · 7th February 2008, 12:10 PM

I doubt if it an oil temperature sender - it is not in circulating oil, and in any case does not look like the ones in the optional equipment parts book. More likely it is the sender for an electric pressure gauge, although it does not look exactly the same as the ones shown in the parts book - 555704 or DRC242 after 1976, although it could under the rubber cover, which is not shown.

John

**Dinty** · 7th February 2008, 12:23 PM

G'day All, Thanks for posting the pic Richard, it already has an Oil pressure sensor in situ, it is the item that is sticking out to the right of frame with a sheilded cover over the green wire, anyway hopefully somebody will know sooner or later cheers Dennis

**Lotz-A-Landies** · 7th February 2008, 01:49 PM

Have not seen that before - however we had* a 1981 Leyland Boxer truck (diesel) which had an oil pressure switch in the line to the reversing lights. If the engine was not running, (therefore no oil pressure,) the switch was open and the reversing lights were off.

This could be the same sort of thing, it would be worthwhile tracing the wires.

Diana

P.S. * In fact we still have it, parked up next to a hayshed.

**Quarks** · 7th February 2008, 02:43 PM

I took a look at the SIII in the garage, and looks quite different. It, however, has a mechanical type oil pressure gauge. I cleaned off the wire going to the spade terminal, to find it was white/brown, which goes to the pressure warning light.

(from above)

But that unfortunately doesn't really get us anywhere, does it?

**Fusion** · 7th February 2008, 02:54 PM

Could one switch be for the oil pressure light and just a long shot here but could the other actually cut the engine off if it looses oil pressure all together

.... Just a thought

**Lotz-A-Landies** · 7th February 2008, 03:07 PM

Originally Posted by thethink

I took a look at the SIII in the garage, and looks quite different. It, however, has a mechanical type oil pressure gauge. I cleaned off the wire going to the spade terminal, to find it was white/brown, which goes to the pressure warning light.

But that unfortunately doesn't really get us anywhere, does it?

If the green wire is the Ign circuit and the Brown/White is going to the pressure warning light.

Could it just some be pragmatic P.O./mechanic who fitted an aftermarket or alternate type of switch. If the thread is the same, you can pretty much use a low pressure switch off anything.

Diana

**lro11** · 7th February 2008, 07:22 PM

I have this setup on my diesel engine so I am glad in a way that I have seen the photo, because now I know it is not just a bush mechanic modification. But to answer the question, no idea what it does but I will find out and update everyone. they both have smiths UK on them and one has 700kn/m2

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