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Post by Mr Stabby on Sept 8, 2018 16:16:48 GMT
Has anyone ever retro-fitted a header tank? I'm thinking about doing it on mine, mainly to be able to keep a better eye on the coolant level, like most BMCs the coolant needs a small top-up from time to time. I'm thinking of replacing the pressure cap on the Bowman tank with a non-pressurised sealing cap and feeding the header tank via the overflow pipe, is there any reason why this would not be a good idea?
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Post by Deleted on Sept 8, 2018 16:22:56 GMT
don't even go there
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Post by Mr Stabby on Sept 8, 2018 16:26:48 GMT
Well, it is something more that I'm toying with the idea of rather than something on the "to do" list, but why do you say that? |
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Post by Deleted on Sept 8, 2018 16:51:00 GMT
Bad idea. Too technical to explain.
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Post by Mr Stabby on Sept 8, 2018 17:05:39 GMT
Bad idea. Too technical to explain. Well no, it's a good idea, firstly because the coolant level would be readily visible, and secondly because raising the head would allow me to bleed the towel rail in the wet room which is part of the cooling system, and which cannot currently be bled effectively as the bleed screw is higher than the top of the Bowman tank, but it might be problematic in reality, which is why I've asked. A brief description of why it would be inadvisable would be appreciated. |
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Post by Deleted on Sept 8, 2018 17:10:50 GMT
If you are running the heating off of it then I would of said that was a good idea.
Initially I was not aware of this hence the negative comment .
Do it. You won't regret it.
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Post by Mr Stabby on Sept 8, 2018 17:14:00 GMT
If you are running the heating off of it then I would of said that was a good idea. I would *have* said.  |
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Post by Deleted on Sept 8, 2018 17:14:51 GMT
yes I would have too  |
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Post by kris on Sept 8, 2018 17:29:58 GMT
I think you might have to explain abit more Andrew before he goes ahead and does it on your say so.
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Post by Deleted on Sept 8, 2018 17:35:01 GMT
as I said its very technical.
What about putting a header tank on the towel rail?
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Post by Gone on Sept 8, 2018 17:42:32 GMT
Probably - The current pressure cap seals below the overflow, so if pressure rises the cap lifts and it drains down the overflow. If the cap you propose to use seals on the same face I don’t see how the excess can escape if the cap doesn’t release - this is NOT good. Normally one would have a pipe directly from the cooling system with the pressure release cap on the remote tank. Is there a blanking bolt on the existing tank for a remote pipe connection?
Added - my Beta engine has a blanking hole on the thermostat housing (if I remember right) for this very purpose. Might be worth a look to see if your engine has anything appropriate
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Post by Mr Stabby on Sept 8, 2018 17:55:22 GMT
Probably - The current pressure cap seals below the overflow, so if pressure rises the cap lifts and it drains down the overflow. If the cap you propose to use seals on the same face I don’t see how the excess can escape if the cap doesn’t release - this is NOT good. Yes, I did mention in the OP that if I did do the modification I would be replacing the current Bowman tank pressure cap with a non-pressurised cap. |
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Post by JohnV on Sept 8, 2018 21:12:45 GMT
I did fit one a long long time ago ..... from memory I got the whole thing from a scrap renault (12?) replaced the pressure release cap with a straight cap that did not have the seal (Ithink I might have made it from the old cap) The header tank was plastic and had it's own pressure release cap and fed it from the original overflow..... It worked smashing for years Sorry I can't remember details.
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Post by Gone on Sept 8, 2018 21:33:55 GMT
Probably - The current pressure cap seals below the overflow, so if pressure rises the cap lifts and it drains down the overflow. If the cap you propose to use seals on the same face I don’t see how the excess can escape if the cap doesn’t release - this is NOT good. Yes, I did mention in the OP that if I did do the modification I would be replacing the current Bowman tank pressure cap with a non-pressurised cap. But if the cap doesn’t seal it will leak due to the head of pressure from the new tank. |
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Post by Mr Stabby on Sept 8, 2018 21:34:15 GMT
I did fit one a long long time ago ..... from memory I got the whole thing from a scrap renault (12?) replaced the pressure release cap with a straight cap that did not have the seal (Ithink I might have made it from the old cap) The header tank was plastic and had it's own pressure release cap and fed it from the original overflow..... It worked smashing for years Sorry I can't remember details. That's pretty much what I am thinking of doing, using a header tank from a scrap car, replacing the pressure cap on the Bowman tank with a sealed cap, feeding the new header tank from the current overflow pipe and putting the pressure cap on top of that. Thanks for the input. |
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