Another stoopid question

Technical advice Q&A
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malcolm
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#1 Another stoopid question

Post by malcolm » Fri Apr 26, 2019 5:55 pm

The radiator expansion tank on my series 2 has two pipes; one runs to the radiator, the other is an overflow pipe. At the moment, the pipe to the radiator is on the higher expansion tank fitting. The overflow pipe is on the lower one. Surely this is wrong? Otherwise, when you top up the radiator via the expansion tank, the level hits the overflow and discharges before water goes to the radiator?
Am I missing something? Is my logic wrong?
Malcolm
I only fit in a 2+2, so got one!
1969 Series 2 2+2
2009 Jaguar XF-S

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tim wood
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#2 Re: Another stoopid question

Post by tim wood » Fri Apr 26, 2019 6:03 pm

Yes, these are the wrong way round
Series 1 FHC purchased 40 years ago when I was young. Sold
Series 1 2+2 when the kids were small now sold
Series 1.5 OTS in opalescent maroon, Californian car. My retirement present.

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mgcjag
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#3 Re: Another stoopid question

Post by mgcjag » Fri Apr 26, 2019 6:11 pm

Hi Malcom....you do realise that you dont fill the radiator via the expansion tank.........you fill the rad to bottom of neck....then fit the plain cap....then half fill the expansion tank and fit the pressure cap....Steve
Steve
1969 S2 2+2 & Building a C type replica

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malcolm
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#4 Re: Another stoopid question

Post by malcolm » Fri Apr 26, 2019 7:01 pm

Ah, ok, thanks both. But Steve, what about the way they are connected?
Malcolm
I only fit in a 2+2, so got one!
1969 Series 2 2+2
2009 Jaguar XF-S

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PeterCrespin
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#5 Re: Another stoopid question

Post by PeterCrespin » Fri Apr 26, 2019 7:25 pm

malcolm wrote:
Fri Apr 26, 2019 7:01 pm
But Steve, what about the way they are connected?
You suspected it was wrong.
You’ve had it confirmed.
You’ve had an extra error spelled out.
Now you want an additional opinion?
1E75339 UberLynx D-Type; 1R27190 70 FHC; 1E78478; 97 XJ6L

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288gto
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#6 Re: Another stoopid question

Post by 288gto » Fri Apr 26, 2019 7:30 pm

Hi Malcolm,

Radiator to the lower of the two pipes on the expansion tank. The overflow is on the neck of the expansion tank and is only open when the pressure relief valve on the cap is activated. If I recall correctly it is 7lbs. Make sure you have the correct caps on the rad and the expansion tank , they are different. Pressure cap goes on the expansion tank and the plain one on the radiator.

Hopefully that makes sense.

Simon
Simon
1969 S2 OTS

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JJC
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#7 Re: Another stoopid question

Post by JJC » Fri Apr 26, 2019 7:44 pm

Malcolm: Listen to Tim, forget the rest. Actually, if you think about how the system works, you would have figured it out.

Have fun.

JJ

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#8 Re: Another stoopid question

Post by mgcjag » Fri Apr 26, 2019 7:51 pm

Hi JJ.....if you think Simon and myself have given incorrect information then please explain.......rather than just say ignore what we have said.....Steve
Steve
1969 S2 2+2 & Building a C type replica

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#9 Re: Another stoopid question

Post by PeterCrespin » Sat Apr 27, 2019 8:54 am

Malcolm did figure it out. He came here for confirmation.

It was just his filling technique that was a little hokey, but even that would sort itself out after one heat cycle if the plumbing was corrected
1E75339 UberLynx D-Type; 1R27190 70 FHC; 1E78478; 97 XJ6L

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#10 Re: Another stoopid question

Post by malcolm » Sat Apr 27, 2019 8:58 am

Thanks for all that detail, which is what I needed. Caps checked and ok with pressure cap on expansion tank. Hoses now swopped round. Topping up via rad now.
Malcolm
I only fit in a 2+2, so got one!
1969 Series 2 2+2
2009 Jaguar XF-S

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christopher storey
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#11 Re: Another stoopid question

Post by christopher storey » Sat Apr 27, 2019 9:14 am

JJC wrote:
Fri Apr 26, 2019 7:44 pm
Malcolm: Listen to Tim, forget the rest. Actually, if you think about how the system works, you would have figured it out.

Have fun.

JJ
Do not just listen to Tim, although what he said was perfectly correct. The other advice given about the radiator caps was equally important and also correct, and furthermore the transposition of the caps often gives rise to all kinds of troubles. JJC, who is a V12 man, may be unaware of this

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malcolm
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#12 Re: Another stoopid question

Post by malcolm » Sat Apr 27, 2019 1:36 pm

Thanks Christopher, all good now!
Malcolm
I only fit in a 2+2, so got one!
1969 Series 2 2+2
2009 Jaguar XF-S

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