Humbug
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| posted on 24/1/06 at 07:30 PM |
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Rover 25 expansion tank pressure cap
I noticed some slight moisture around the expansion tank - worryingly, at first glance, on the brake fluid pipe from the reservoir! Also the level in
the tank has gone down very slightly over several hundred miles.
Looking carefully, there seems to be a little fluid on the expansion tank (nearby) and I have read somewhere that the pressure caps have a tendency to
fail.
a) can anyone else shed any light on this as a problem in general?
b) sources of pressure caps? (I will try the MG Rover ex-dealer tomorrow)
Thanks
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DarrenW
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| posted on 24/1/06 at 08:11 PM |
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Do you need a cap for coolant expansion tank? Try Halfrauds.
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britishtrident
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| posted on 24/1/06 at 08:30 PM |
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Thats how it vents no over flow pipe --- sounds like you have had the level a bit on the high side or have had some trapped. Bleeding air out K
series cooling systems can be tricky. Latterly MG-Rover dealers were old to use vacumm pumps.
Thing you have to watch on the older style Rover caps is that some times they don't vent or don't relieve the vacumm on cooling.
With the latter BMW style caps (larger diameter than early ones) you have to make sure they are really firmly tighten.
[Edited on 24/1/06 by britishtrident]
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zetec
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| posted on 24/1/06 at 09:02 PM |
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If I remember correct the Rover has a 8psi cap, I fitted one of these and had the same problem. I later got a westfield tank as I got feed up looking
for the correct tank to fit. It comes with a 15PSI cap as the zetec cooling system does run at a higer presure, fitted no more wet feet!
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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britishtrident
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| posted on 25/1/06 at 10:47 AM |
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Rover cooling systems run at 6 to 8 psi -- with the K series it is important not to exceed this. Even 6 psi is enough to raise the boiling point of
the coolant by almost 10 degrees which should be more than enough for any engine.
Water dosen't expand much when heated even to close to boiling point -if an engine hasn't a mechanical fault but shows big variations in
the header tank level the cause must either be trapped air or localised boiling caused by poor circulation. The K16 suffers badly from air locks
while the Zetec tends to suffer from poor circulation in kit car installations.
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ayoungman
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| posted on 25/1/06 at 11:04 AM |
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rover caps are a known common problem. Replace with a new one. The rubber seal gives way after only a few years old. It might look fine but it
won't be.
It will cause all sorts of weird problems, leaking, air locks and general overheating issues. HTH
"just like that !"
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Humbug
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| posted on 25/1/06 at 08:48 PM |
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quote:
Originally posted by ayoungman
rover caps are a known common problem. Replace with a new one. The rubber seal gives way after only a few years old. It might look fine but it
won't be.
It will cause all sorts of weird problems, leaking, air locks and general overheating issues. HTH
Got a new one today - seems worth trying at £5.75+VAT... now to see whether the problem recurs.
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