Triumph Herald 1360 Expansion tank

[rconchie]

I have a 1970 Triumph Herald Convertible 1360 constantly having to top up due to fluid expanding and running out of the overflow.

Does anyone have any advise regarding fitting and expansion bottle, please?

Which is the best to use? Where to put it? And any cautionary notes that I should be aware of?

thanks

Robert

[Clive]

Vitesse, GT6 and I think (??) spitfire had a non-pressurised expansion tank as std. 

https://www.canleyclassics.com/triumph-vitesse-radiator-late

 

The idea is that any water pushed out by expansion is sucked back as the engine cools. No reason not to fit one to a herald (I intend to fit one to my mk3 spitfire. When I get the time!)

[dougbgt6]

Yes, on GT6. It's plastic and gets very mucky, but put it through the dish washer, comes up a treat.

[Colin Lindsay]

How much fluid is it losing? If you fill right to the top you'll obviously lose some through expansion, but the level in the radiator shouldn't fall by any great degree.

Small regular topups are part of Herald driving but larger amounts may point to fluid loss through some other defect.

[rconchie]

It loses too much, but comes out of the overflow, no other leak.

I have seen a few other Heralds with this solution which seems to fix the issue.

[Pete Lewis]

To make it work you need a double sealed rad cap

 

one to keep the pressure cotrolled and one to seal the cap seal to the top of the filler

 

if you are loosing lots I would look at the cap is it the right depth to seat the pressure washer on the base ofnthe filler

Is the rubber in good condition also check the vacuum valve is seated, its inside the main spring

 

fitting a bottle is not addressing the main problem

 

pete

[Darren Groves]

If you haven't already, use a 13lb radiator cap, I used to lose a bit of water when using the 7lb jobbies.

 

Darren