SE6a Temp Gauge reading low?

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RichM
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SE6a Temp Gauge reading low?

Post by RichM » Wed Mar 14, 2018 4:21 pm

Hi all, my SE6a Rover V8 conversion (formerly Badger's car) has a low reading temp gauge.

Before I start tinkering I wonder if anyone has an opinion on what the likely causes might be?

When the engine is up to temp the electric kenlowe fan kicks in. The rad is evenly warm all over as are the pipes suggesting that coolant is moving around the engine. However, the gauge mostly reads 0 degrees, occasionally rising to about 10 or 20 degrees max.

The previous owner said that he had all of the gauges reconditioned and re-calibrated so hopefully that isn't the culprit. Or maybe that's what caused the problem?!

I guess temp sender might be first thing to check?

Any help appreciated!

Cheers Rich



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SE6a Temp Gauge reading low?

Post by Oldconn » Wed Mar 14, 2018 4:51 pm

The original temp.sender would have been specifically for the Smiths gauge fitted to most Scimitars. Ford temp senders will give a false reading. Check the make of your gauge and look for an Essex temp sender.
Edit: Iv'e just noticed, of course, yours is a Rover V8 conversion :oops:


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SE6a Temp Gauge reading low?

Post by AJL Electronics » Wed Mar 14, 2018 5:05 pm

Short the sender connector to deck. You should then get full scale deflection if the gauge is OK. That will prove the sender or not being faulty. Make sure that the fuel gauge is reading correctly in case the regulator which feeds both has gone down. You could also do a sender resistance check.


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SE6a Temp Gauge reading low?

Post by RichM » Wed Mar 14, 2018 7:16 pm

Thanks guys, I'll try shorting it and see what happens.

Forgive me if its a daft question (trying to get me to understand electronics is a bit like getting a dog to read Shakespeare) but I just want to clarify - shorting it will check that the Gauge is responding correctly to a peak or max signal and if so this would suggest that the Gauge is ok but the Sender is either faulty (or possibly the incorrect type)?

And if that's the case then the logical next step might be possible replacement of the Sender with a known 'Smiths/Scimitar' compatible one (assuming it will fit in the V8 etc).

(BTW The fuel gauge seems to read ok, its just the temp that seems way off)

Rich



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SE6a Temp Gauge reading low?

Post by scimjim » Wed Mar 14, 2018 10:28 pm

Correct, the fuel and temp gauges get a stabilised +10ish volts from the voltage stabiliser, the senders vary the resistance to earth. Giving it “full” Earth should give full scale deflection on the gauge.

I would think there’s a good chance the senders will share the same thread.


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SE6a Temp Gauge reading low?

Post by peter freeman » Wed Mar 14, 2018 10:30 pm

scimjim wrote:
Wed Mar 14, 2018 10:28 pm

I would think there’s a good chance the senders will share the same thread.
From memory they do - I had a V8 in my 6A - sorry to let it go as the engine really suited the car.



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