Thanks again for taking the time to reply John. Fortunately as I declaired near the outset of this discussion, my standard tune mid 80`s + 8 has not ever overheated even in one of the hotest days that Italy had experienced while touring there a number of years past. Fortunately I am currently not in need of replacing either of the caps on my old +8 at this time, but thanks for the suggestion of possible suppliers.

My thinking on contributing to this post was in the hope that my simplistic thinking might just help others to assess any possible issues they might be concerned about relative to possible overheating in their older Morgans, by encouraging discussion on the make-up and differences in design of cooling systems and components perhaps fitted to their Morgan, either correctly or incorrectly. All of which seems possible in the passage of time given it seems simple to imagine a pressure cap is just a pressure cap, when in fact it seems that there are indeed quite a few different types available which will fit on the filler neck of many a rad or expansion vessel.

Yeah, trying to keep it simple can require too many words from the likes of me... Sorry.

Oops... Seems GoMoG replied while I was typing mine... As I typed and as best I understand it the idea of a two way pressure cap that is designed to prevent vacuum build up and thus collapsing flexible hoses, which would seem to further complicate cooling when next fired up...?

It would seem in my old +8 there may be little or no need for that type of cap on my Morgan as the pressure build up in the expansion tank would seem to combat the chance of vacuum being formed in the system as the coolant is returned to the rad as it cools...?

I suspect the same two way closed type of cap as mine, IF fitted to the rad in a recovery system might perform to allow coolant to pass back through it though as I typed I also suspect that type of cap if used in that way would perhaps have a much lower blow off pressure than the cap on the remote tank...?

Yeah cooling Morgans of all types has ever been a hot topic.... (-:

Last edited by Luddite; 26/12/23 01:28 PM. Reason: update