Plunky
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| posted on 23/10/16 at 03:19 PM |
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Zetec Expansion tank
Afternoon,
I have been having some issues with the coolant expansion tank on my Zetec powered F27.
A little while ago the tank split, so I replaced it with a Renault Clio one, with the blue cap.
I am now getting a build up of pressure and the cap keeps letting go, getting the car and my legs a bit wet!
Has anyone else experienced this? I've looked and there seems to be a brown cap that is a slightly higher pressure, would this rectify the
problem?
Thanks,
Liam
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britishtrident
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| posted on 24/10/16 at 06:50 AM |
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Assuming there is nothing wrong with the plumbing layout and the thermostat isn't stuck shut it sounds like a head gasket issue.
Over pressure was probably the cause of the original tank splitting.
The enginge plumbing should have a route for coolant to re-circulate from the engine side of the thermostat back to the water pump inlet. This called
the by-pass circuit and is normally a constant hot flow through the heater on the donor. If you don't have this connected or are using a
water rail this could be the problem.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Plunky
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| posted on 24/10/16 at 07:45 AM |
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It's a brand new engine so I would hope it's not headgasket!
The split tank was on the old engine.
Does anyone have a diagram of what the plumbing layout should look like and I'll double check it is correct.
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rm0rgan
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| posted on 25/10/16 at 01:28 PM |
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quote:
Originally posted by Plunky
It's a brand new engine so I would hope it's not headgasket!
The split tank was on the old engine.
Does anyone have a diagram of what the plumbing layout should look like and I'll double check it is correct.
 
Try this...
Sigs are uncool.
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Plunky
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| posted on 26/10/16 at 05:43 PM |
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Just checked, and the plumbing layout is the same as the diagram.
The car itself doesn't overheat.
A new, higher pressure cap has arrived so I'll give this a try when I get the chance.
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rm0rgan
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| posted on 28/10/16 at 10:27 AM |
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quote:
Originally posted by Plunky
Just checked, and the plumbing layout is the same as the diagram.
The car itself doesn't overheat.
A new, higher pressure cap has arrived so I'll give this a try when I get the chance.
I find that my expansion tank settles just below the minimum level mark in the expansion tank on my zetec MK when cold - if I top it up, it evacuates
it out of the cap too - maybe you've overfilled it and it was just venting the excess to settle at the right level/pressures as I think zetec
expansion tanks are quite a bit bigger than Clio ones from pictures I have seen. They hold around 5ltrs of water/antifreeze mix in a Mondeo whereas we
probably hold a couple of litres less at a guess given lack of piping, heater matrix etc...
Sigs are uncool.
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