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How Do I? Temperature gauge

robzam

In Fourth Gear
My series III is fitted with a TDI300 engine but the temp gauge is still the old one, ie not the defender type.

I'm suspecting that the gauge is not giving the real temp reading.

Is it possibile to either change the gauge to a modern one or else do something to the current gauge to give a more accurate reading?
 
You need to see if you can fit a series sender in the engine. I have been told that although the threads should be different (UNF vs Metric) they do actually fit, although I've not tried myself. Otherwise you could see if you can get an adaptor made up somewhere.
 
Or else change the sender and the gauge for a defender one, I don't think that a series sender will fit a 300 m8.
 
Yep I think so. Currently, the sender is a 300TDi one but the gauge is an S3 one.

Does a TDI300 gauge fir the series dash?? Or else I was thinking of installing a seperate gauge but I must be sure that it gives an accurate reading
 
My series III is fitted with a TDI300 engine but the temp gauge is still the old one, ie not the defender type.

I'm suspecting that the gauge is not giving the real temp reading.

Is it possibile to either change the gauge to a modern one or else do something to the current gauge to give a more accurate reading?

I suggest you read thie post on here from AllenC who tells that I'm talking out the back of my head when advising that you put the original engine sender in the "new" engine.

https://www.lrukforums.com/showthread.php?t=81750
 
if you fit a seterate guage you will have to find out the engines normal operating temperature , a simple cold to hot guage wont work as it wont be calibrated to the engines temp range.
 
Tks nobber,

so the best thing is to try to find an original S3 sender and fit it to the TDI300 is it??
 
I'm going to see if a series sender fits into the metric hole when I go to worcester next week. Someone on another forum has tried it and apparently it works but I'm a sceptic so I want to try for myself before I pass the advice on. I can post weds/thurs next week.
 
I'm going to see if a series sender fits into the metric hole when I go to worcester next week. Someone on another forum has tried it and apparently it works but I'm a sceptic so I want to try for myself before I pass the advice on. I can post weds/thurs next week.

I think you will find that the 300Tdi temperature sender unit is 1/8 NPT, well mine is. :D
Nor is ther much room in the 300Tdi thermostat housing to be re-tapping a larger thread in there.
 
I think you will find that the 300Tdi temperature sender unit is 1/8 NPT, well mine is. :D
Nor is ther much room in the 300Tdi thermostat housing to be re-tapping a larger thread in there.

On the other forum they suggested making a collar type adaptor - Series thread female on one side and new thread male on the other. Apparently, quite easy to do with the right tools and a lathe.

Just need to find someone with the right tools and a lathe.....
 
On the other forum they suggested making a collar type adaptor - Series thread female on one side and new thread male on the other. Apparently, quite easy to do with the right tools and a lathe.

Just need to find someone with the right tools and a lathe.....

cant you just weld/braze a nut of the correct thread/size over the existing hole? if it was a bit shallow maybe some boss white and hemp or ptfe to seal it up.
or is the housing cast?
 
cant you just weld/braze a nut of the correct thread/size over the existing hole? if it was a bit shallow maybe some boss white and hemp or ptfe to seal it up.
or is the housing cast?

The housing is a cast aluminium of some type.
I did look at having a boss welded on but in the end decided that it would be a cheap and less involved to fit the SPA gauge to mine.
 
I'm going to see if a series sender fits into the metric hole when I go to worcester next week. Someone on another forum has tried it and apparently it works but I'm a sceptic so I want to try for myself before I pass the advice on. I can post weds/thurs next week.

It fits. Used a sender from a series (560794) and it fitted into the metric 2.25 engine (should be PRC2505).
 
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