I have a pretty good hunch that this is a classic u-joint rattle but I wanted to bounce it off of the pros here on this forum. A little, condensed version of the back-story. The boat is a 1984 Sylvan, 120 (2.5L) Chevrolet 4 cylinder Mercruiser with an Alpha MR out-drive. Gimbal bearing ( Greaseable type) has 2 hours of run time and was installed at certified Mercruiser service center last month. Water in the bellows killed the last gimbal bearing that they installed after only 2 years and they replaced it under warranty since I have had repeated water intrusion issues since they worked on it. The video, linked below, was taken on the shakedown cruise after the latest gimbal bearing install 2 hours in. Engine is idling this video and rattle occurs when turning in both directions 3/4 to full lock in either direction. I also have a vibration during acceleration. Rattle begins at the 0.19 second mark and in this video, I am turning only to port. Thoughts.
Thanks in advance.
Thanks in advance.