Any ideas as to what this is??

[Dinty]

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:wasntme:
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]

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

[Phoenix]

The pic from dennis. No idea myself!

6707

[JDNSW]

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]

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:wasntme:

[Lotz-A-Landies]

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]

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.

http://www.aulro.com/afvb/attachment.php?attachmentid=6711&stc=1&thumb=1&d=1202358006 (http://www.aulro.com/afvb/attachment.php?attachmentid=6711&d=1202358006)
(from above)

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

[Fusion]

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 :confused: .... Just a thought :)

[Lotz-A-Landies]

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?
:mellow:
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]

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

[Blknight.aus]

that makes it an oil pressure switch set at about 8psi.

[harro]

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

Take a bow John, I believe the prize? is yours:).

[lro11]

does anyone have any rubber covers they don't want?

[Tank]

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
John, the 3 bearing engine I got off you has the same sender unit complete with the wiring, it has a long green wire with a Black plastic spade (female) fitting, the other wire is thicker and is either black or brown, hard to tell in torchlight, is not as long as the green wire and has a red (female) bullet type connector. You mat be able to trace where they go to on the car, if you still have it, hope your getting some rain, we are getting bucket loads, Regards Frank.

[Tank]

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:wasntme:
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??
I have one the same on an engine I got off JDNSW (John), it is I believe an 80/81 3 bearing motor, I have posted to John the details of the wiring, he may be able to trace the wiring back, if he still has the car. BTW you dont have a 5 bearing Block and Crank you might want to sell, do you, Regards Frank.

[JDNSW]

I have one the same on an engine I got off JDNSW (John), it is I believe an 80/81 3 bearing motor, I have posted to John the details of the wiring, he may be able to trace the wiring back, if he still has the car. BTW you dont have a 5 bearing Block and Crank you might want to sell, do you, Regards Frank.


I have a wiring diagram in the owner's manual - I will post it later today after I get the kids off to school.

John

[JDNSW]

I have a wiring diagram in the owner's manual - I will post it later today after I get the kids off to school.

John

I had a look at it before scanning it - electric pressure gauge is not on it, but if it follows normal LR wiring practice the black wire will be earth, and the other will go to the gauge, which will be fed by either a light green wire from the voltage stabiliser on the back of the speedo or a green wire from terminal 8 on the fuse box.

Hope this helps, and if anyone wants the wiring diagram from the owner's manual, let me know.

John

[Dinty]

G'day All, Well apparently the gizmo is a cut out switch, pecuilar to Diesel's only. It is in the circuit for the reverse lights, and it works on Oil pressure, if the engine is running and you select reverse gear the light will work (or should), if you stop the engine and leave it in reverse with the ignition ON the reverse light will not be on, I had this in the back of my mind and it was moved forward by Diana's comment re Leyland Boxer etc, anyway thats what it is, but that still doesn't help my problem with my Electric Oil pressure gauge LOL, maybe that sensor is U/S, anyway thanks for all the responses, cheers Dennis:wasntme::angel:

[JDNSW]

G'day All, Well apparently the gizmo is a cut out switch, pecuilar to Diesel's only. It is in the circuit for the reverse lights, and it works on Oil pressure, if the engine is running and you select reverse gear the light will work (or should), if you stop the engine and leave it in reverse with the ignition ON the reverse light will not be on, I had this in the back of my mind and it was moved forward by Diana's comment re Leyland Boxer etc, anyway thats what it is, but that still doesn't help my problem with my Electric Oil pressure gauge LOL, maybe that sensor is U/S, anyway thanks for all the responses, cheers Dennis:wasntme::angel:

Well, well, - one of the differences between the UK and Australian setups for my diesel County is the oil pressure switch on the reversing light. This is apparently an Australian requirement that is triggered because there is no accessory position on the County ignition switch. (to prevent the reversing light being on when you are just sitting with the engine stopped listening to the radio, I suppose)

John

[Dinty]

G'day All, John just to confuse the issue even further, my 110 County is a 11/84 job and was one of the press release vehicles for the 110 County with the Isuzu engine, no heres the odd bit, the original ign switch had an acc/position because when it came to Oz as a CKD it was originally a V8 chassis, anyway cheers Dennis:wasntme:

[dobbo]

G'day All, John just to confuse the issue even further, my 110 County is a 11/84 job and was one of the press release vehicles for the 110 County with the Isuzu engine, no heres the odd bit, the original ign switch had an acc/position because when it came to Oz as a CKD it was originally a V8 chassis, anyway cheers Dennis:wasntme:


my County has an acc position as well, don't they all?

[lro11]

G'day All, Well apparently the gizmo is a cut out switch, pecuilar to Diesel's only. It is in the circuit for the reverse lights, and it works on Oil pressure, if the engine is running and you select reverse gear the light will work (or should), if you stop the engine and leave it in reverse with the ignition ON the reverse light will not be on, I had this in the back of my mind and it was moved forward by Diana's comment re Leyland Boxer etc, anyway thats what it is, but that still doesn't help my problem with my Electric Oil pressure gauge LOL, maybe that sensor is U/S, anyway thanks for all the responses, cheers Dennis:wasntme::angel:Can anyone confirm this information maybe a wiring diagram perhaps Uncle Ho can come to the rescue.

[Dinty]

G'day All, I don't know how much more confirmation you need but I don't consider it nessacery to ask anyone any further as the information came from a respected Land Rover mechanic of 35 years, so as far as I'm concerned I'm satisfied that the information is spot on cheers Dennis:wasntme:
PS I will also now be removing it from the engine as it's NFG to me.:angel:

[lro11]

G'day All, I don't know how much more confirmation you need but I don't consider it nessacery to ask anyone any further as the information came from a respected Land Rover mechanic of 35 years, so as far as I'm concerned I'm satisfied that the information is spot on cheers Dennis:wasntme:
PS I will also now be removing it from the engine as it's NFG to me.:angel:

Well I just bought another one of these and talking to the guy about it he said it is not for the reverse light circuit, and on closer inspection I would have to agree. With the engine off (no oil pressure) the contact is closed. So if you left the car in reverse with the ignition off the reverse lights would stay on. His suggestion is a temperature gauge sender????

[UncleHo]

G'day Folks :)

My suggestion is that it is a low oil pressure shut down switch, that works in tandem with an electric soleniod engine shut down, that is if oil pressure drops the engine will shut down,therefore saving the engine from destruction.

Or

An Engine Oil Fail Buzzer switch, same principle as the shut down switch but sounds a buzzer & light on the dash, often fitted to Buses and Earthmoving Equipt.



cheers

[JDNSW]

Well I just bought another one of these and talking to the guy about it he said it is not for the reverse light circuit, and on closer inspection I would have to agree. With the engine off (no oil pressure) the contact is closed. So if you left the car in reverse with the ignition off the reverse lights would stay on. His suggestion is a temperature gauge sender????

Since it operates through a relay for the reverse light, that does not necessarily follow - just a matter of whether you use the normally open or normally closed contacts on the relay. In fact, since sensors that are closed with no oil pressure are far more commonly used (and hence available), it would make sense to use one, so the relay is energised when there is no oil pressure.

John

[Shina]

Looks like a low oil pressure shut down to me.