940 separate temperature gauge

[jpliddy]

hi has any one fitted a independent/seperate temperature gauge to a 940 ?

[Laird Scooby]

Originally Posted by jpliddy

hi has any one fitted a independent/seperate temperature gauge to a 940 ?

Jim - in the interest of understanding what you're asking, why would you want to fit a separate independent temperature gauge? What temperature are you looking to measure - engine or outside air?

[jpliddy]

Hi dave it's too keep an eye on the coolant temperature I've never been able to fix mine so thought if it's not a big job just fit another coolant gauge useing existing temperature sensor at front of engine on my 940 diesel
If it's possible?

[Laird Scooby]

Originally Posted by jpliddy

Hi dave it's too keep an eye on the coolant temperature I've never been able to fix mine so thought if it's not a big job just fit another coolant gauge useing existing temperature sensor at front of engine on my 940 diesel
If it's possible?

It's possible Jim but most aftermarket gauges need their own sender units/temperature sensors to function correctly.

What's actually wrong with your current temperature gauge? Have you investigated the sensor/sender unit? Have you tested the gauge itself works? Is your engine just running cold because it needs a new thermostat maybe?

Diesels are well known for taking a long time to warm up and even when being driven, unless they're driven hard, often dont get up to full working temperature which means they never get to their full efficiency.

Does the existing temp gauge move at all?

[jpliddy]

hi dave
ive had problems with the thermostat gauge for years it it just reads zero a lot then will kick into life and go to 10 o clock then back again i have swopped the gauge . had joints soldiered if i unplug the sensor at the front of the engine it still reads 10 0 clock then back to zero so i gave up but do you have a thought what might fix it it used to sit at 12 o clock when working fine years ago
regards jim i have a spare header tank with the float in the bottom but no wiring for it .

[Laird Scooby]

It sounds like the fuel gauge in my 760 Jim - all the work ethics of a 1970s coal miner!

First thing to do is to ascertain exactly what the gauge is doing in relation to engine temperature.

https://www.ebay.co.uk/itm/Temperatu...O/392187836370

If you invest in one of those, take the car for a 5-10 mile drive at a decent sort of speed, stop somewhere safe and leave the engine running, pop the bonnet and aim that at the thermostat housing (usually where the top hose joins the engine) and read the temperature, it should be in the high 80s, preferably about 88C give or take a few degrees. If it is reading 88C ish then by rights the temp gauge should be at the 12 o'clock position.

If not, there's a very high chance your thermostat needs renewing. You can also use that device to check for hot or cold spots on your radiator, wheel berings, brakes and so on and many uses around the home too - it's invaluable for balancing a central heating system for example.

One thought - nobody has decided to wind PTFE tape around the temp gauge sender/sensor threads have they? If so, that will cause problems, had that on mine (except it was the EFi sensor they'd done it to! ) and it causes the circuit to break, leaks round the sensor and so on.

[baggy798]

Yeah, I have. It required extensive modification of the cluster but I wanted it to look OEM as possible.



Installing one elsewhere would be a lot easier (like in the bottom left of the pic behind the indicator stalk).

Don't know the thread diameter for the D24 sender but adapters are available.

Should be able to tap into the stock gauge wiring (positive, negative, and sender signal wire).

[jpliddy]

Thanks for your thoughts everybody hi baggy your gauge looks good did you have a faulty gauge im thinking its not the gauge itself as I've changed it. But is there more complex things ive got to do to fix my problem

[jpliddy]

Dave I've only just changed the thermostat fitted another genuine one

[Laird Scooby]

Originally Posted by jpliddy

But is there more complex things ive got to do to fix my problem

First you need to find out if the engine is actually getting up to temperature Jim, as i described with the infra red thermometer above.
If it's not, the gauge may in fact be working most of the time when it doesn't read zero.