Have had the same problem myself from previous owner. the same crack location plus even little bit of the flat lower half. i tightened it down with the broken piece in there. Did multiple layers of Permatex Cold Weld, letting each layer cure in between coats. without coolant in the system for a dry mating area. there might be slight troubles removing housing (as the cold weld is holding the housing to block) when i need to but everything is sealed and FINALLY not leaking on me. (been 2 weeks)
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E90 328xi 6MT | Intake Scoops | K&N + Charcoal Filter Delete | DIY Dinan 3in | 3.25in + 3.5in piping | N54 Manifold | Ceramic Coated Headers | Secondary Cat Delete | Xdelete | 3.91 Diffs | 22RPD Tune
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