Hi All,
So I thought I'd put this in the series section as there isn't a dedicated subforum and I know some people do swap the 2.5 17H petrol engine into series Landys.
Backstory is that in my newly acquired 110 the temp gauge is getting quite high and almost into the red when the engine is up to temp, I've not been on any long drives yet, just a mile runs so far due to other issues like the brakes that im working on getting sorted out. I was told by the seller it's the temp sensor at fault, it doesn't actually overheat, and that does seem to be the case so far... nothing seems like its getting too hot checking with an infrared thermometer. I'll probably replace the thermostat anyway as I guess that could also be the issue, but I was trying to search for the right temp sensor for the 17H engines.

I bought PRC3541 as it was listed as being right but firstly its got 2 pins instead of just one, and also its massive! Now I see there is an adapter between the current sensor and the block but it still just seems a bit big? Also if it did happen to fit what about the second pin? is that just a ground? So what do you guys think? what actually is supposed to be the right one for the 17H? also any other thoughts on this issue?

Current sensor:

From what I know.
If the PO is saying its the sender and its not getting hot (you have checked physically) then he is probably right.

What engine was in the 110 originally as thats the sender you need to match the gauge, assuming the gauge is original. and yes you may need an adaptor of some sort.
So you will have to do a bit of digging/searching. It has been mentioned/discussed on here many times.
You may find you have the correct sensor (evidence of possible adaptor) so maybe it is just broke .

You may also find somebody has left out the thermostat, because of the assumption it was getting hot. Test the new thermostat works before putting it in.

J

marjon said:

From what I know.
If the PO is saying its the sender and its not getting hot (you have checked physically) then he is probably right.

What engine was in the 110 originally as thats the sender you need to match the gauge, assuming the gauge is original. and yes you may need an adaptor of some sort.
So you will have to do a bit of digging/searching. It has been mentioned/discussed on here many times.
You may find you have the correct sensor (evidence of possible adaptor) so maybe it is just broke .

You may also find somebody has left out the thermostat, because of the assumption it was getting hot. Test the new thermostat works before putting it in.

J

Click to expand...

It is an original 17H, not been swapped, although it does raise the question has the gauge been swapped at some point? I was reading that the gauges and sender need to be matched and was hoping this would just be some sort of mismatch between the two.

On doing some more googling it seems that the PRC3541 is wrong, and it should either be a PRC2505 or PRC6663 for a 17H depending on VIN... with a couple of sites suggesting I need the former! So I've ordered one of those. I guess I could also pull out the old sender and test it in some 80-90C water while still grounded to the block? If that reads high then its definitely an issue with the sender/gauge. That will have to wait though as I don't want to take it out until I have all the bits to do this and the thermostat together.

Also coincidentally the Landy did come with a box of bits with a used thermostat in the back...

If thats the original engine then yes it narrows it down to being a sensor/gauge/wiring issue. So should be fairly easy to track down.
Do you have wiring diagrams for it? if not do a search it will comin handy.

So old thermostat in a box of bits . Sounds like the chances are you may not have 1 in at the moment. Test it if its good I would say highly possible you dont have 1 if you are not getting up to proper temp with your infered thermometer.

Let us know how you get on.

J

So I haven't got all my new bits yet (I foolishly thought I could order from John Craddock and actually get things within a week), I did get the new PRC2505 sender though. I thought I'd test it out so connected it up and stuck it in a cup of near boiling water, which was about 91C when I left my kitchen, probably somewhere 80-85 outside.

Unfortunately the gauge rose right up far into the red, so there is definitely still an issue somewhere. So at least this supports the idea that it's not overheating! I then pulled the gauges out and found the temp gauge is a PRC3106. Not sure if this is right or not? one site I looked on suggests this is for a later model, but others suggest it is right. I saw a PDF chart somewhere that suggests a PRC2505 sender and PRC3106 gauge should work fine so im not sure.... possible faulty gauge?