Header Tank

[Guest jwaterman]

hi all,

 

I have a problem, I have fitted my new vulcan engine, had it running, 20 mins into running her up the alternator gives up, so have replaced that, Now i come to drive her and before i even get out of the garage i realise the cooling system isn't getting up to pressure, :gdit: will i ever get to drive my new 160BHP robin hood, GRRRRRRR. :boohoo:

 

the header tank i have fitted at the moment is off a volvo 740, a nice compact cylinderical unit, fitted on the bulkhead above the rocker cover. When i fitted it first time around the original 740 cap had a pressure of 125kpa (18psi or 1.25 bar) this procceeded to blow my rad apart . So few days later at the scrappy i was attempting to remove a sump from a transit and while strugling i bumped my head on a object half buried in the ground, after cursing abit i turned over to remove it and low and behold it was a rad cap that looked identical to my 740 header tank cap but with a pressure of 75Kpa (11ps1 or .75bar) stamped on . So cooling system sorted from that moment on.

 

Now that the cap has given up the ghost i know have a big problem, I don't know what car it came off, neither does my local volvo dealer. does anyone know what i am talking about and know the part i need and where i can get one from???

 

Or do i have to change the header tank??? If so does anyone have any really good ideas or suggestions on what one to use???

 

Please help i would really love to drive my newly improved Robin hood, my fingers are itching, :gdit:

 

thanks in advance

 

john

[Longboarder]

No idea of the cap you need. Have you a pic? Alternative is to switch to another pressurised header or fit a pressure cap to the rad and go for a non pressurised overflow system.

 

Nigel

[Guest TerryBarry]

Is the current cap a screw on plastic one with one or two small circular discs (valves) when viewed from the underside ?

[Guest chris brown]

Take the cap to your local motor factors they should be able to identify it. Just because it fitted a Volvo tank doesn’t mean that is what it came off my guess would be Renault (lots of common or similar parts) but it could be anything.

[Guest jwaterman]

the cap is a black screw on cap with VOLVO & 75Kpa embossed on it. I have tried all my local and larger motorfactors, no joy, even Volvo no use.

 

Terry yes sound like the one, are the valves in a brass disc?

 

john

[Guest TerryBarry]

75kPa - that sounds like it's off a Volvo 340 - probably with the B14 (1.4litre) engine.

But why doesn't the Volvo dealer recognise it

Looks like this in situ

Hope this picture of raw power doesn't offend anyone

[st3v3nw]

terry,

the volvo 340 series uses a 100kpa cap.

 

ste

[Guest Bob Rowell]

Most Volvo 340's were fitted with Renault engines. I have fitted the header tank from a Rover 100 (Metro), still using the standard RH rad, but with the seal and spring removed, so it is just a blank cap.

The tank is quite narrow and fits nicely onto the bulkhead. As it has a 15lb cap fitted the water boiling point is raised. Since carrying out this mod my car hasn't overheated once. Before the mod overheating, and dumping coolant were a daily occurrence.

[st3v3nw]

ive found it at last!!!

 

you need to find a 745t, the caps are coloured like this : the green cap is 150kpa. The white cap is 100kpa, and the black/grey cap is 75kpa.

 

just to be extra geeky here is the part number for the 75kpa one: 1357775 list price is £12.85

 

go back to the dealers with that and watch them eat their words!!

 

hth

 

ste

[Guest TerryBarry]

terry, the volvo 340 series uses a 100kpa cap

 

Well the one that is pictured is black and was rated at 75kPa

This ties in with the Haynes 0715 Manual

[Guest salty_monk]

You can probably puck up a generic one at Halfords fairly cheap...

[Guest jwaterman]

well guys

 

i have to say you have all come up top trumps for me today.

I thank you all very much for your help and advice, i will go to the volvo dealer tomorrow and get the one i require. I may go for the 100Kpa just to help keep things a little cooler, but i must say i never had any over heatong problems with the 75Kpa one.

I know now what car the cap came off so that helps now end and the part number and price, what more can a chap want. I will be zipping around the norfolk lanes before long, watch out Bob here i come.

 

once again a big THANK YOU.

 

john

[st3v3nw]

no problems mate, thats what we are all on here for.

 

steve

[Guest jwaterman]

I thought i would visit my scrappy today just on the off chance they may have a volvo with a cap on.

as luck would have it there were 2 340's there, both with the correct cap and 1 was nearly new. so a quid later i was on my way home to sort the car out with both, one as a back up.

 

cheers all for your help

 

john