Z3 Coolant manifold
This is the manifold that has the history of cracking. There is another one on
the front of the engine that is reported to not have the same problem. After twisting
and turning this one to fully seat the O ring in the block I used thread lock
to hold the two bolts in place that go through the brass rings in the flange plates
along the bottom of the manifold. Note the rear brass ring sits in a slot. I figure
that allows for thermal expansion, so I cranked the bolts down tight.