Many thanks to everyone who answered my somewhat desperate question.
Today I removed the aluminium sump. One of a lesser quality, which made me
suspect that maybe the pipe from the relase valve got blocked by the thick
sump bottom. As it turned out this was not the case I simply cut the spring by
2.5 coils, which restored the pressure to the correct range.
I had previously sleeved the oil passages to prevent the dreaded crack in the
block that lets oil into the water. So my conclusion is that either this
restricton caused the increased pressure or a faulty spring. Lots of work but
all worth while.
Once again many thanks to all helpful fellows on this list!
Magnus Karlsson
Sweden
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