Thread: What "Switch" in 2.6 Litre Engine - 2A

A bit like sharing cookey's chook shed!

Sorry, I wasn't very clear in my post and I am probably confusing people. The sensor with the 3 mounting screws is the switch associated with the cold start warning light. The other one lower down is the normal sender which drives the temperature gauge.

Looks like you have a bit of fun parts swapping coming up

Cheers,
Terry

Originally Posted by rover-56

Sorry, I wasn't very clear in my post and I am probably confusing people. The sensor with the 3 mounting screws is the switch associated with the cold start warning light. The other one lower down is the normal sender which drives the temperature gauge.

Looks like you have a bit of fun parts swapping coming up

Cheers,
Terry

G'day Terry,

Okay the 3 mounting screws is the cold start one on the 2A.

My 1975 Parts Catalogue states that Part Number 545010 was superseded in November 1972 onwards.

Was this switch replaced by something else or just eliminated altogether? If this is the case where does one of the wires from the thermoswitch mounted on the choke cable (cold start) connect to on the Series 3? I have the thermoswitch but it is not wired to anything on any of the Series 3 motors I have.

The page I scanned and posted earlier does have part number 560794; this is identified as "water temperature transmitter" that looks like it in the diagram goes near the thermostat. I could be reading the diagram incorrectly too. Is this the replacement for the switch under three screw plate in the 2A "from November 1972 onwards "or were they always there anyway - even with Part Number 545010 hooked up?

It all depends on my level of masochism at the time as to whether I do a complete swap out of the Holden motor. The other option is to use the specially bought dial gauge and my following the instructions to get the replacement gear box alignment right. The link that is posted under "you must read this" sticky note under the Series - Holden Powered site (BEFORE FITTING A HOLDEN ENGINE CHECK ALIGMENT FIRST). Either way I will replacing the clutch components and getting the flywheel machined - when the money comes to do it that is. This could take a while it seems! I am just taking dolly steps at the moment and using what resources I currently have available. Yes, Terry lots of parts swapping fun ahead

Kind Regards
Lionel

Originally Posted by Lionelgee

G'day Terry,

Okay the 3 mounting screws is the cold start one on the 2A.

My 1975 Parts Catalogue states that Part Number 545010 was superseded in November 1972 onwards.

Was this switch replaced by something else or just eliminated altogether? If this is the case where does one of the wires from the thermoswitch mounted on the choke cable (cold start) connect to on the Series 3? I have the thermoswitch but it is not wired to anything on any of the Series 3 motors I have.

The page I scanned and posted earlier does have part number 560794; this is identified as "water temperature transmitter" that looks like it in the diagram goes near the thermostat. I could be reading the diagram incorrectly too. Is this the replacement for the switch under three screw plate in the 2A "from November 1972 onwards "or were they always there anyway - even with Part Number 545010 hooked up?

It all depends on my level of masochism at the time as to whether I do a complete swap out of the Holden motor. The other option is to use the specially bought dial gauge and my following the instructions to get the gear box alignment right. The link that is posted under "you must read this" sticky note under the Series 3 Holden Powered site. Either way I will replacing the clutch components and getting the flywheel machined - when the money comes to it that is.

Kind Regards
Lionel

The water temperature transmitter is powered from the gauge and is a variable resistance. The 3 screw one is just a switch which closes on temperature rise, giving voltage from the warning light a path to ground via the cable switch,turning on the warning light. So the sequence is power from ignition to warning light, then to the cable switch, then to the cylinder head switch, and then to ground.
Terry

Hello All,

In the dark and armed with a camera I just went into the paddock and checked my collection of vehicles. I do have a Series 3 that has the little rectangular box mounted on the cold start cable. It does have two wires and they feed directly back through the fire wall.

Apart from the inner cable connecting to the carburettor; unlike the 2A motor, there is absolutely no contact with the head or the engine block.

I could not work out the colour of the trace on the black wire between the camera flash and the caked on grot, so I will check them out tomorrow morning and follow the circuit back. It will, from all suggestions, go back to the "cold start" warning light in the instrument cluster.

It is all very interesting One thing about old Land Rovers, one never stops learning about them and their quirks.

PS: I checked with the "Green Bible" the Land Rover Series 3 Repair and Operation Manual (ed. 4) and it shows how there is just a white wire with a blue trace and a black wire with no colour trace on it. The part in the schematic drawing is Part 41, described as "switch choke". The circuit has the white wire with the blue trace going back to Part 35, "warning light - choke". The other side of Part 41; the black wire goes to an earth point - somewhere?

Kind Regards
Lionel

AFAIR The black wire goes to the triangular switch which earths when it gets hot.
On an RRC there is a switch also at the choke knob. When you pull out the choke, this completes a circuit to the triangular switch which is open circuit until it warms up. It then grounds and Voila a red light comes on.
Regards Philip A