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David Scott
United Kingdom
141 Posts |
 Posted - 11/11/2017 : 10:02:35
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Despite fitting an O ring in the radiator indent, coolant still manages to find its way onto the rad shell and bonnet. Is there a bespoke washer or an effective solution to fit between rad cap and rad?
Thanks in advance.
David |
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Colin Butchers
United Kingdom
1479 Posts |
Posted - 11/11/2017 : 11:31:01
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'O' rings are not wide enough. The original cork seals can still be bought from your local motor cycles spares stockists. They are used in many motor cycle petrol tank filler caps.
Colin B. |
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Bruce Sutherland
United Kingdom
1543 Posts |
Posted - 11/11/2017 : 19:37:46
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David,
A thought here as to the root-cause of the coolant expelling onto the radiator shell - is this due to overheating/boiling?
If so, is your cooling system functioning correctly? It might be worth you making the checks recommended in - http://www.triple-mregister.org/uploads/retro/Engine_cooling.pdf
Bruce. (PB0564) |
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bloodysalmon
United Kingdom
1481 Posts |
Posted - 11/11/2017 : 20:26:05
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I like you David have wondered how and if you can stop water overflowing once hot from the rad! However I was only recently told (by pre-war mechanic) this is normal and because these MG's aren't pressurized rads they will always leak from the overflow pipe!
Is this true gents? Can or is there a solution, even if is to pressurize in some way ... how would/could you do it anyway?
Chris Blood D0407 & F0753 |
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PeterL
United Kingdom
1709 Posts |
Posted - 11/11/2017 : 21:09:45
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2 issues, drops of water coming out through the cap threads and running don the chrome radiator or over the painted bonnet. My rebuilt everything F does this.
What rather amuses me is that the overflow overflows directly onto the distributer, or in front of it which is much the same thing at speed.
I have put up with the former but will now look for a cork seal and with regard to the latter have connected a plastic tube to the bottom of the overflow pipe and lead it to the nearside so that it can evacuate itself happily as far away from the distributer as possible.
Why do you suppose the overflow was put on the offside?
Cheers
P |
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David Scott
United Kingdom
141 Posts |
Posted - 11/11/2017 : 22:40:20
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Thanks for this, gents.
I’ll legit down to local m/c specialist on Monday for a suitable washer that, fingers crossed, should deal with the issue of seepage from around the cap.
I do get overflow from the vent pipe but that stops once a finite amount has been expelled after coolant change or overfilled top up and I’ve come to expect and accept that.
So, thanks for the cork seal suggestion, Colin.
I’ve had the rad off a couple of times in the last week while sorting charging and dynamo issues and the coolant had seemed pretty clean so i’m reasonably happy, though not complacent, about the general state of the system. Nevertheless, the article on engine cooling issues was excellent so thanks for that, Bruce. I shall certainly use a thicker concentrate in future!
Thanks once again, I will keep you posted.
David
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bloodysalmon
United Kingdom
1481 Posts |
Posted - 11/11/2017 : 22:40:49
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ok peter, so that really is how they work then and its not a problem, its just that nobody until the other said this was the case that water will overflow when hot ... I suppose this is why the none expanding 'water-less' water is used as it doesnt expand!
Chris Blood D0407 & F0753 |
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sam christie
United Kingdom
3051 Posts |
Posted - 11/11/2017 : 23:09:30
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I have noticed this effect when the system is very full of coolant but not actually overheating / boliing.
Surplus coolant is expelled and then the system works fine but at a slightly lower level. My guess is that the overflow is caused by an expanding air bubble somewhere in the system which belches out surplus coolant before it all settles down and gives no further trouble.
I wish the surplus all went down the overflow onto the road but the flat seal under the radiator cap (like so many others it seems) is ineffective.
Sam |
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Robin Macmillan
United Kingdom
415 Posts |
Posted - 12/11/2017 : 00:13:37
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It is all to do with driving too quickly around sharp bends and the water in the header tank sloshing about .... well done David !
PB 0527 |
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KevinA
New Zealand
668 Posts |
Posted - 12/11/2017 : 05:00:03
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The solution is to not overfill your radiator!
No really, I mean it. Most prewar cars with thermosyphon cooling were designed so that you fill to the top of the core, not the top of the tank |
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Ian Bowers
United Kingdom
937 Posts |
Posted - 12/11/2017 : 08:28:58
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If you fill the radiator to the 'top' when cold, then it will expel water on the first run up to temperature, as the water heats and expands.
After that, the water level in the radiator will be lower than when you originally filled it, but is just right for a hot run, and will not overflow again. There may be splashes from the filler cap when cornering enthusiastically, and that is a cork seal problem which needs solving.
Ian Bowers
OD 6791
J3 3772 |
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bloodysalmon
United Kingdom
1481 Posts |
Posted - 12/11/2017 : 08:51:16
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gents this is very comforting ... at least I can drive now not worrying about the water levels, after all temperatures never get beyond 85 ish on the gauge
Chris Blood D0407 & F0753 |
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Colin McLachlan
United Kingdom
987 Posts |
Posted - 12/11/2017 : 10:54:54
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If you fit a small (half litre) catch tank, with the end of the overflow pipe reaching to the bottom, then if you have a good seal at the radiator cap, the radiator should suck the water back from the catch tank as it cools.
Colin
Markinch, Fife.
PA 0613
MG3242
Register No. 2591 |
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bloodysalmon
United Kingdom
1481 Posts |
Posted - 12/11/2017 : 12:27:48
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Colin, this sounds quite ingenious set up, I need to see/here more about this ... got any further details on what you have used or some photos to show please?
Chris Blood D0407 & F0753 |
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Colin McLachlan
United Kingdom
987 Posts |
Posted - 13/11/2017 : 10:36:32
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Here you go:
Colin
Markinch, Fife.
PA 0613
MG3242
Register No. 2591 |
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Colin Butchers
United Kingdom
1479 Posts |
Posted - 13/11/2017 : 10:47:18
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Good advert for Finnigans, Colin. Any relation ?
Colin B. |
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