scudderfish
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 posted on 8/3/15 at 09:58 AM |
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Will the change to cooling work?
This is how my cooling system is basically laid out :-
It flows out of the manifold through the pipe in the middle, through the rad and back into the engine via toe corrugated pipe to the left. The narrow
diameter pipe feeds into the bottom of the expansion bottle on the right.
The problem is that the expansion bottle is >31 years old. The neck is corroded, the plastic chewed up, and the cap no longer provides a good seal
against atmospheric pressure, let alone running pressures. If I take the valve out of the top hose, the bottle will fill with coolant. I can't
get a new replacement, and any I buy from ebay for an extortionate amount will probably be in a similar condition.
The idea I had in the shower was to replace the aluminium tube I have in the top hose with one of these :-
http://www.carbuildersolutions.com/uk/in-line-radiator-filler-neck-38mm I'd then plumb the overflow feed from that into the base of my
expansion tank, and block off the small diameter feed from the radiator. The expansion tank would then become just an overflow tank and it would
remove it from the pressurised side of the cooling system. The top hose is the highest part of the cooling system, so it would burp air into the
bottle and bleed itself that way. On cooling, any fluid in the bottle would be drawn back into the system.
Where am I wrong?
Regards,
Dave
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britishtrident
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| posted on 8/3/15 at 10:19 AM |
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If you fit a pressure cap in the top hose it is likely to dump water and steam on the ignition system . A Rover 25 expansion tank should be small
enough ton fit in place your Austin Allegro expansion bottle.
[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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adithorp
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| posted on 8/3/15 at 10:29 AM |
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I'd stick with the pressurised bottle. Overflow one isn't as good a solution. Do you know what car that one is from? Looks familiar but
can't place it. You could just search around the scrapers for bottle that would do the job; There's loads of different designs on tin tops
and you should find something. Common ones used are VW globe type (prob' not enough space) or Rover 24/45. Alternatively have you looked at all
after-market ones or have an ally one made to fit the same mountings (Bryn @ AllyFab is often recommended)
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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scudderfish
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| posted on 8/3/15 at 03:09 PM |
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The original is from a Rover SD1, the donor for the original engine. I've found several others on ebay such as this :-
UE9s3wCPC!BQ+FTQZmlQ~~60_1.JPG) .
I assume I'd connect the bottom input to the current feed from the top of my radiator, but what would I do with the upper, smaller input? It
looks like it feeds into the pressurised area.
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britishtrident
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| posted on 8/3/15 at 03:36 PM |
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If you want to do it that way to keep it nice and simple just block the top inlet off and it will work the same as the original BL tank.
However the normal way to plumb it in is to connect the lower outlet to the bottom hose and the upper inlet to a high point in the system ie the top
of the radiator or top hose. This system is better for bleeding out trapped air.
[Edited on 8/3/15 by britishtrident]
[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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02GF74
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| posted on 8/3/15 at 07:11 PM |
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The set up you have looks like a pressurise tank with overflow. Similar tk series land rover in concept. The radiator cap has valve that lets
coolant out wjen it expands into an overflow bottle ( which you dont have) then valve opens to suck coolant back in when it cools down.
The tank you show doest not work like that as the system is sealed. The top inlet is the bleed and provided it is connected properly highest point in
the system, it should work fine.
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scudderfish
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| posted on 9/3/15 at 07:24 AM |
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Thanks for the advice, Clio expansion tank is on its way.
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