JAK hello I’m Cary from Detroit. I am workin on a Sabre 28-1 with a friend, and we are having water intrusion into the engine. We think the problem is from an exhaust replacement that was done incorrectly - just a single pipe was used to replace the pipe-in-pipe design. After finding your post I really think that’s our problem and it seems the only solution is to replace the current exhaust pipe with a pipe-in-pipe system.
Do you have any details on what your mechanic fabricated? Unfortunately I do not know how the system is supposed to work.