Replacing expansion tank

Replacing expansion tank was created by sean79

Posted 2 weeks 20 hours ago #209497
I have recently discovered a small crack in the expansion tank...... I have bought a new one but is it possible to change it without having to bleed the system if I clamp the pipes soon as I take them off? 
Thanks 
by sean79

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Replied by TA22GT on topic Replacing expansion tank

Posted 2 weeks 20 hours ago #209500
Well that is exactly what I am going to do tomorrow when I remove mine to clean it out and fit a low water coolant alarm.
The expansion relief hose is the highest point and the bottom hose is higher than the engine block and will vent in to the tank.
You will be fine.
by TA22GT

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Replied by Cobber on topic Replacing expansion tank

Posted 2 weeks 20 hours ago #209502
Probably it would depend on how successfully you clamp them off, preferably without damaging them. But sooner or later you are going to have to bleed the system anyway so why not learn to do it now before you start this job. In case you accidently get some air in, it's quite easy to do, look up the how tos  here on the forum.

"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"

by Cobber

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Replied by sean79 on topic Replacing expansion tank

Posted 2 weeks 20 hours ago #209503
So it is pretty much safe to remove the pipes from tank and clamp them one by one so to speak as long as I clamp them quickly?
by sean79

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Replied by Airportable on topic Replacing expansion tank

Posted 2 weeks 20 hours ago #209504
If you draw water down, possibly using a syringe, so the coolant drops below the tank level, it’s a one out, one in. It’s probably a good idea to pop a clamp on the return JIC.
M

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Replied by sean79 on topic Replacing expansion tank

Posted 2 weeks 20 hours ago #209505
I've seen the how to but I don't have ramp or axel stands to get to the bleed point on the underside that's why was asking if could do it without bleeding if clamped well 
by sean79

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Replied by sean79 on topic Replacing expansion tank

Posted 2 weeks 20 hours ago #209506
Thank you, much appreciated 
by sean79

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Replied by Cobber on topic Replacing expansion tank

Posted 2 weeks 19 hours ago #209507
Since you are going to this trouble, you are of course fitting a low coolant alarm if not already fitted, and if fitted are fitting a tank suitable with the low coolant alarm.
NO iif's or buts.....or sooking about cost! A low coolant alarm is essential for our cars, It is utter madness to try and run our cars without on fitted, the cost is nothing compared the the cost of not having one! you have been told........stay told!
There are several available, one of our members offers one that is highly regarded, I myself have run the excellent Browns & Gammons Low coolant alarm for over 10 yrs without any trouble.
Failure to head this advice WILL result in a dismissive I told you so! Do not set yourself up to be a victim!

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Replied by Delbourt on topic Replacing expansion tank

Posted 2 weeks 19 hours ago #209509
Why do you need to get under the car to bleed the system?
The 6mm bleed on the water rail is accessible after removing the engine bay cover.
The rad and heater bleed points are from the front bonnet.
If you are not disturbing the hose on the engine other than at the tank why do you need to get underneath?

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Replied by Cobber on topic Replacing expansion tank

Posted 2 weeks 15 hours ago #209511
Are you confusing the bleed points with the drain plug?  The bleed points are all accessible from above, as I said check the procedure in the how tos, or the workshop manual also downloadable from this site in the libary section

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by Cobber

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Replied by Notanumber on topic Replacing expansion tank

Posted 2 weeks 4 hours ago #209526
Most definietly fit a low coolant alarm if you have not already got one. BuceTF135 on here does a very inexpensive and foolproof one which fits to the existing expansion vessel, that several of us have. Other types are available

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Replied by BruceTF135 on topic Replacing expansion tank

Posted 2 weeks 2 hours ago #209529

I have recently discovered a small crack in the expansion tank...... I have bought a new one but is it possible to change it without having to bleed the system if I clamp the pipes soon as I take them off? 
Thanks 
As said previously, you don't need to drain down the system to change the expansion vessel, as it is the highest part in the cooling system.
  • Start by draining, sucking, or syphoning the coolant out of the vessel. 
  • Undo the two screws that hold the tank in position. 
  • You can then lift it even higher before removing the two pipes and keeping them held up. 
  • Fit the new tank and reconnect the pipes.  
  • Replace the coolant.
  • It would be sensible to bleed the 3 points referred to above.
As also mentioned previously, I can do you a better than eBay deal on a low coolant alarm.  Just send me a private message.
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