Keeper96 Posted December 11, 2016 Share Posted December 11, 2016 Hi I'm running an ex 19j 90 with a full discovery 300tdu conversion with the engine and gearbox in the factory 300tdi defender position. I have also fitted a 300tdi defender temp sender. The problem is that the temp gauge sits at the very top of the white, however with no thermostat in it sits below 1/3 on the white. I tried a new thermostat, no difference. Ive just replaced the water pump, viscous fan and a new thermostat but the gauge is still reading very high. I bought a thermometer today and took several readings. With the gauge at the very top of the white the header tank is between 76-80c when driving. When I got home I pulled the thermostat housing top plug out and took a reading with everything still hot and it was 82.4c. The thermostat is set to 88c IIRC so in my mind the engine must be fine and the fault is in the gauge? Any input is appreciated. Jamie Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 11, 2016 Share Posted December 11, 2016 Are you using a 300 Tdi gauge, Jamie ? Mo Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted December 11, 2016 Author Share Posted December 11, 2016 Hi mo, no, just the original td gauge Quote Link to comment Share on other sites More sharing options...
western Posted December 11, 2016 Share Posted December 11, 2016 you need to use the TD sender to operate the TD gauge or convert sender & gauge to the 300tdi version. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted December 12, 2016 Share Posted December 12, 2016 Yup Jamie, you need matching gauge and sender. Mo Quote Link to comment Share on other sites More sharing options...
Keeper96 Posted December 12, 2016 Author Share Posted December 12, 2016 Brilliant thanks! Is the 300tdi gauge a direct swap for the TD gauge? Quote Link to comment Share on other sites More sharing options...
Ex Member Posted December 12, 2016 Share Posted December 12, 2016 Yes, but they are useless carp. They read normal or engine cooked only.... Best option is a VDO Vision gauge and sender. Quote Link to comment Share on other sites More sharing options...
western Posted December 12, 2016 Share Posted December 12, 2016 23 minutes ago, Keeper96 said: Brilliant thanks! Is the 300tdi gauge a direct swap for the TD gauge? Yes, but as Red90 says the VDO vision temp gauge is much better, you can source one from merlin motorsport https://www.merlinmotorsport.co.uk/p/vdo-water-temperature-gauge-310010002 for reasonable price Quote Link to comment Share on other sites More sharing options...
Ex Member Posted December 12, 2016 Share Posted December 12, 2016 This is the correct sender for that gauge: https://www.merlinmotorsport.co.uk/p/vdo-water-temperature-sender-1-8-npt-thread-323801005001 1 Quote Link to comment Share on other sites More sharing options...
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