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Thread: Fitting a temperature gauge to a 2.25 diesel

  1. 10th March 2020, 11:00 AM #1
    westernterra
    westernterra is offline Fossicker
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    Fitting a temperature gauge to a 2.25 diesel

    I am looking at fitting a temperature gauge (one that shows temperature range in degrees) to my 2.25 diesel in order to be able to monitor engine temperature more closely. There doesn't seem to be any obvious spots to mount the additional sensor in the head. I understand the 2.25 petrol engine has a spot on the thermostat housing but that is not on the diesel. I don't want to tap any other holes in the head if possible.

    The only other spot is the heater outlet in the rear of the head (see photo) - has anyone installed a temperature gauge/sender here by including a t piece in the heater hose? (looking at using a vdo mechanical gauge (capillary) rather than an electric one) Any other suggestions? Thanks!
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  2. 11th March 2020, 04:44 PM #2
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    aussearcher
    aussearcher is offline Master
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    Have a look on eBay for "temperature gauge adapter". You cut your radiator hose and insert these aluminium bodies that take a sensor. They come in all common radiator hose diameters.
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  3. 12th March 2020, 04:36 PM #3
    westernterra
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    Quote Originally Posted by aussearcher View Post
    Have a look on eBay for "temperature gauge adapter". You cut your radiator hose and insert these aluminium bodies that take a sensor. They come in all common radiator hose diameters.

    Thanks - I have had a look - some people have told me that the top radiator hose where these adapters seem to be targeted is not ideal as it is 'before' the thermostat and so only gives a proper reading when the thermostat is open - thoughts? Hence my suggestion for the heating outlet? Thanks again,
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  4. 12th March 2020, 05:54 PM #4
    Bigbjorn
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    Just bite the bullet and find an accessible spot towards the front of the head to drill and tap. Not at all difficult. Grey cast iron taps easily. A bit of Trefolex, grease, or EP diff oil on the tap.
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  5. 12th March 2020, 07:30 PM #5
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    aussearcher
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    As Bigbjorn suggests, tapping into a water gallery in the head is the ideal approach, but the adapter approach has the advantage of being quick and easy. No reason not to put it into the bottom hose if you prefer, but I don't see any problem with using the top hose. You are interested in catching an overheating event, so the thermostat will be well and truly open by then (excepting the rare event of a thermostat failure). I've used the top hose on my 1967 Cooper S - a car destined by design to overheat - with the sensor used to switch on an auxiliary electric fan.
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