Disco 200tdi in Defender

[Mark Y]

I know there are many out there that have done this conversion, We have just completed this conversion after cooking the TD engine, what non of us can work out is the temp gauge is in the red (overheating).
But we have checked the engine with digital heat sensor's and checked rad,pipes etc and they are hot but not overheating.
The thermostat should open at 88deg but the engine is rarely that hot on digi heat sensors.
I have run it without thermostat and the same overheating on gauge, I have changed thermostat and heat sender unit (new TD one)  and it still says it's overheating, it had its first outing since engine change today and went great, but it is very unnerving with the gauge in the red all the time.
Any suggestions please ?.

[ChrisW70]

Disco sender is completely out of scale for the TD gauge - you need ERC8973 adaptor and PRC2505 sender. Found that info here a while back.

[zulublue]

Hi Mark, this is a very commom thing when you swap to a disco engine, I changed my (block only) a while ago and although it uses the defender sender it was reading high, not as far over as yours but on the edge of the white, anyhow I had also fitted a X-Eng Thermo switch and electric fan but it never came on, so last week I changed my sender unit and gauge to a digital unit, the most I am getting 82c so no wonder the fan never cut in as the sensor was in the lower return pipe.

If you are unsure get one of these units, they fit in to your dash and are easy to wire up, If you want to come and have a look drop me a PM.

Mark

Have a look here - http://forums.lr4x4.com/index.php?showtopic=32000

[fezzy192]

love the gauges mark very nice but i bet they were pricey lol

[zulublue]

Hi Kev,

Mate they cost so much money, I could have sold 6 sets in the past 2 day's, but because I am a nice forum member you can have them for £18 ea. :dance:

Think I should have had a job lot, anyway this is where I got them from.

http://www.mcgillmotorsports.co.uk/index.php?act=viewCat&catId=10 :lol:

[scotana]

can you just fit a resistor to bring the voltage down?

[zulublue]

can you just fit a resistor to bring the voltage down?

Why would you want to, I run twin Maxima Gel batteries and they need 14.4V to recharge, for some reason the volts drop to 14.4 when moving and creep up a litte bit when standing but only by 0.2v

[scotana]

I mean to stop the temp guage showing such a high reading solder a resistor on to the spade terminal then connect to that for the signal.

[zulublue]

I mean to stop the temp guage showing such a high reading solder a resistor on to the spade terminal then connect to that for the signal.

I don't understand what benefit that will have you will still not know what temperature you have got, seems pointless doing just for aesthetics.

[scotana]

does anyone know who these part numbers refer to? paddocks, craddocks, morleys?

[Mike_Hammond]

I mean to stop the temp guage showing such a high reading solder a resistor on to the spade terminal then connect to that for the signal.

I don't understand what benefit that will have you will still not know what temperature you have got, seems pointless doing just for aesthetics.

The resistor suggestion is perfectly valid, there are pleny of write ups on the web on how to go about calibrating an analogue temp gauge and it'll cost you pennies for the components. A bit of Ohms law and you'll be away... just remember wire in series across the sender to drop the voltage, parallel to increase it ;)

[bogie]

The sender you want is the green one,the orange and black read too high!

[hairyasswelder]

does anyone know who these part numbers refer to? paddocks, craddocks, morleys?

By the picon the link it looks like genuine part numbers  ;)