Join Date: Feb 2003
Location: Wokingham, Berkshire
Local Time: 09:49 PM
Mentioned: 0 Post(s)
Quoted: 24 Post(s)
Checking coolant level with my alloy tank is not a problem because the tank has a collar around the bottom outlet inside the tank which is as least as tall as the Minimum level and maybe as tall as the Mid-point level.
If you look in the opening of the tank from above, I guess if the top of the collar is visible above the remaining coolant you need to add enough coolant to just cover it.
Obviously this is not as easy to check as the see-through plastic tank, and it does mean that you have to unscrew the cap to check the level!
I've just gone and removed the seal from my old cap as I was going to investigate fitting an 'o' ring in addition to the seal to see if this solved the sealing/over tightening problem.
Don't know if you have done this but interestingly I found that: 1) you can't reverse the seal in the cap because it is shaped and only goes in one way around. 2) The seal is much thicker and harder than I imagined, and although it definitely will get an indentation in it if you tighten it down hard, it is much thicker than I thought, so I don't think over tightening it is a problem apart from getting it undone later!
in hindsight, I think the problem with with a plastic tank might be more to do with the finish of the top lip of the tank not allowing the cap seal to bed down properly.
So, apart from damaging the tank neck or the cap through overtightening, I think we ought to be able to tighten it enough to produce a good pressure seal without resorting to changing the tank.
Meanwhile I am in search of a suitable size & thickness 'o' ring to try this out on my alloy tank because I still get occasional leaks if I don't tighten the cap up enough after checking levels.