Originally Posted by britmog
I too use the expansion pressure cap on the recovery tank method, although, there are many who will tell you that is wrong... and the pressure cap should always be on the radiator. Air bubbles are prevalent in this era of Morgan cooling and the above method is a good way of dealing with them, it also means all the fluid filling and checking of levels is done at the recovery tank. The system will burp air and fluid out of the recovery tank finding its level, works a treat.

Dear Britmog,

Thank you for your feedback. It is invariably helpful.

There will ALWAYS be some who tell you are wrong. They don't really understand why, but they will say it anyway. If they do know why, and convince you, as we say in Quebec tant meiux!

Bad advice goes viral. And I stubbornly used a pressure cap on my radiators for 10s of thousands of miles and a few years. PIA. Then, in annoyance, I started collecting Rover/LR Factory Workshop Manuals and experimenting. They showed my method described above! ooo grin2 However, you can find Manuals that will say anything one wants. frown2 BTW, after years at this stuff, I no longer trust "everyone" or supplier assurances or Manuals. Forgive me all. At best, Rover/LR Manuals merely indicate what someone, with less mileage than you and nary a Morgan thought at some much earlier point in time, before a few million miles had been logged by the relevant owners' community. In my case, as John Sheally 2 used to constantly say on eMog, "I speak from experience. I am unoffended if you choose another way." One can only truly learn from mistakes.I have made a ton over 30 years. However, the only other person I have ever met in our community who had no hesitation in tossing any method or components regardless of their cost IF it did not improve his Morgans, was Bill Button. Weird eh?

In sum, NOPE. This method works on all trad Plus 8s who have tried it. It has something to do with the engine configuration in a Morgan but, as usual, like everyone else, I have a tendency to move on when I found a solution. I used the best method, trial and error. Later Plus 8s moved to a bigger tank placed adjacent to the rad.

I forgot something important. I began with the Sd1 reservoir (below) standard to all Morgans of the day. Pitifully small affairs. https://rimmerbros.com/Item--i-CRC4058 You will note how they ALL refer to the thingie as "an expansion tank". It was attached to the bulkhead I moved to my first aluminum rad, only one available, a Griffin from the USA. I swapped their expansion tank in at the same time. Double the capacity. I moved to a Mulberry the day he came out with one. Later Plus 8s used bigger tanks as well. The Factory had wisened up. They also cleared it away from the ever more crowded bulkhead and placed it next to the rad where it could get nice and hot. doh Not their fault. The miracle of the MMC is how they kept these cars compliant for so long! However, the newer placement of the expansion tank appears to violate the cardinal rule that an expansion tank should always be higher than the top of the radiator. Deadly Domino Effect strikes again!

gmg

P.S. These are many little tweaks that are costless. They remove annoyances and make your Morgan happier.

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Last edited by gomog; 20/12/23 05:17 PM.