Morning Dave, interestingly what i found on my B200E seems completely different to the diagram you posted, i found part C and D but from what I felt these two parts connect to the block by a short (1 fo 2 inch) stubby hose with no sign of the black box device, the other two pipes are also quite different, it was getting dark so I'll have another look tonight and get some photos. I had all the hoses off to clean, the top hose connector on the manifold was clear, but unsure of the bottom one, i managed to get my finger in to check the first cm or so but im by no means a contortionist so thats about as good as it gets!
I did the cap trick, it stayed on well but moved around a little bit, more to do wifh vibration though i think rather than positive pressureas at idle you can see the engine moving slightly, will test again post pre-mot work.
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