1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

Water gauge test

Discussion in 'Defender 90 / 110 / 130' started by Rorie, May 9, 2019.

< Previous Thread | Next Thread >
  1. Rorie

    Rorie Active Member

    Joined:
    Dec 21, 2011
    Posts:
    585
    Likes Received:
    29
    Old style gauge (white line to red line with no numbers)
    Black sensor
    300tdi out a disco

    Even at idle, the gauge goes up to just below red. As soon as i drive the gauge goes as high as it can.
    My understanding is the green sensor would make this issue worse (which it did when i tested)

    Online the simple test is to put the signal cable to earth, then the gauge should go to red. It did! So this would suggest the sensor is bust.

    New sensor, exact same reading (i swapped it when the engine was running).

    So looks like the gauge is fault? Any way to test?

    If replacing, are the OEM ones worth that money? Loads of cheap ones online, but its a simple bit of kit, right?

    (oh, i should add, with a temp gun i can confirm the engine is only sitting about 40 degrees on idle and the thermostat isnt open yet, so must be a dodgy reading)
     
    Last edited: May 9, 2019
  2. kermit_rr

    kermit_rr Well-Known Member

    Joined:
    Dec 9, 2018
    Posts:
    1,461
    Likes Received:
    623
    Location:
    North Shropshire
    Have you checked the wire hasn't rubbed thru somewhere?
     
  3. Rorie

    Rorie Active Member

    Joined:
    Dec 21, 2011
    Posts:
    585
    Likes Received:
    29
    Ah, as that would be giving some sort of earth contact. Good point. I’ll bypass the wire and connect directly tonight and see what happens
     
  4. mick 1986

    mick 1986 Well-Known Member

    Joined:
    Aug 20, 2010
    Posts:
    1,733
    Likes Received:
    380
    Location:
    Lost
    The sensor from the discovery isn’t compatible with the defender gauge. You need a defender sensor and adaptor to fit the discovery engine. I think Steve Parker website is where you need to look.
     
    Hicap phill likes this.
  5. tottot

    tottot Well-Known Member

    Joined:
    Nov 7, 2010
    Posts:
    3,588
    Likes Received:
    610
    Location:
    west wales coast
    Or for just a few more bucks fit an aftermarket capillary gauge that reads in numbers/degrees and is accurate.:)
     
    zeaphod likes this.
  6. zeaphod

    zeaphod Well-Known Member

    Joined:
    Aug 13, 2013
    Posts:
    2,746
    Likes Received:
    666
    Location:
    Belfast, Norn Iron
    As above, fitting an aftermarket gauge saves a lot of faffing with getting the right sensor/gauge. A suitable Durite electric gauge is cheap enough, easy to fit and gives you a real idea of how hot the engine is.
     
  7. Rorie

    Rorie Active Member

    Joined:
    Dec 21, 2011
    Posts:
    585
    Likes Received:
    29
    The black sensor is for the defender though and thats what i have fitted.

    Yeh thats what i was thinking about. But you note 'electric gauge'. How is that different? The ones i have seen just have a new gauge that comes with its own sensor...

    What thread size is the temp sensor as there seem to be lots available....
     
  8. zeaphod

    zeaphod Well-Known Member

    Joined:
    Aug 13, 2013
    Posts:
    2,746
    Likes Received:
    666
    Location:
    Belfast, Norn Iron
    The electric aftermarket gauges use the existing wiring, no need to install the pipework for a capilliary gauge. The thread is another story, the existing sensor is likely 1/8 NPT, the aftermarket sensors may be different, but you might be lucky - seems to be the same according to the durite website.
     
    Rorie likes this.
  9. Litch

    Litch Well-Known Member

    Joined:
    Jun 26, 2006
    Posts:
    1,752
    Likes Received:
    185
    Location:
    Bedfordshire
    There is a direct replacement sensor to make the Defender gauge work with a Disco 300TDi but I don't know the part number (I have never done it) but I know it exists and hopefully someone can come up trumps. That way you keep the standard Defender gauge.
    Although mine is Defender 300TDi I wanted to change all my gauges so went for the Durite electrical set-up, the supplied sender is a direct replacement for the Defender 300TDi (so you will need an alternative) but I am fairly certain that Durite sell one that fits (you need to establish the sender thread and speak to them).
    The other option is to use a capillary gauge, I was going to do this on my Defender (and bought the necessary adaptor) but in the end decided I didn't like the fragile copper pipe and went electrical instead.

    The only problem with changing just a single gauge is that the instruments don't match and anyway, in your case I don't think it is necessary.


    DSCF10031.JPG


    ADAPTOR.JPG
     
  10. owas

    owas Well-Known Member

    Joined:
    Jul 30, 2014
    Posts:
    506
    Likes Received:
    175
    AMR3321 is what I have fitted to my disco 300tdi in to early 110 and it's sits bang on half way (and then slightly over when I forgot to open the radiator muff!)

    I have the one from Steve parkers too and that only sits at 1/4.
     
  11. Rorie

    Rorie Active Member

    Joined:
    Dec 21, 2011
    Posts:
    585
    Likes Received:
    29
    Is that not just for 200tdis that had a different thread? It’s not as much a conversion as just a different sensor (the black one)?

    Yeh the black one Amr3321 is what I have.

    I am sure the gauge isn’t right as it worked fine before! I think it got damaged,

    New Durite electric one ordered!
     
  12. zeaphod

    zeaphod Well-Known Member

    Joined:
    Aug 13, 2013
    Posts:
    2,746
    Likes Received:
    666
    Location:
    Belfast, Norn Iron
    The 200TDi thread issue is another story - don't go there.
     
< Previous Thread | Next Thread >