Expansion Tank...S2

[F908 Tim]

Hi Guys,
Can someone please tell me what the plastic expansion tank in the S is off?
Did a search and can't find.
Is it Fiesta/Escort? No mankings on my present tank which I have just mullered undoing the bottom hose and now need to replace!

Thanks.

[bigtalljim]

The S parts guide says rover, but to be honest fit anything that looks good. A nice stailess item is pucker.
To be honest the engine on the S came from the Ford range of vehicle so try anything from a Granada/Scorpio to Sierra XR4i/4x4 or Capri. The later the car the better chance it had a expansion tank fitted.

[F908 Tim]

Ahh, found a post by LeeBee saying its an old leyland, Alegro or Rover/Metro. Not sure we even need one at all though on the S as it only seems to collect overflow water and can't feed it back into the system.

[bigtalljim]

The Steve Heath bible does say something about the water level rasing and falling depending on the demands of the system. I think it expands under pressure a bit even when cold, then the cooling system sucks it back in again, then it allow for expansion when hot. But this may only be so if the radiator cap is on the overflow and not the swirl pot. But as no one can agree which location the cap should be on and it works in different configs on different cars, go for what works.

S seres eh?

[Le TVR]

F908 Tim said:

Not sure we even need one at all though on the S as it only seems to collect overflow water and can't feed it back into the system.

If it doesnt feed back into the swirl tank then youve got a leak assuming the pressure cap is on the swirl tank but we dont have the bandwidth to restart all that again... either the pressure cap doesnt seal to the top of the swirltank or the low pressure return valve in the cap is siezed...

[GreenV8S]

Or you have a perfectly good pressure cap designed to go on the header tank and you have it fitted IN THE WRONG PLACE.



>> Edited by GreenV8S on Thursday 11th May 09:56

[F908 Tim]

Newish cap on swirlpot,correct pressure and no leaks.
the expansion tank level never rises or falls.

I'm appy with that.

[bridgdav]

F908 Tim said:

Newish cap on swirlpot,correct pressure and no leaks. the expansion tank level never rises or falls.

How can you see the level whilst driving..?

[F908 Tim]

I have an underbonnet pet rodent that tells me of course!

Also I have the bonnet up and check every weekend,just incase he ever lets me down