Engine ran normal for 65 miles yesterday at mostly cruising speed pushing a 20 Grady. With another 15 miles left to go to get back to port the engine started to "thud". I can't think of a better way to describe it. It doesn't feel like it is shutting off and turning back on. It may be what is happening but it happens so fast I can't tell.
At cruising speed the thud is really noticable. When I first heard it I thought I bumped something solid in the water. Then not knowing what to do I reduced speed to 5 knots and 1500 RPM. At this speed it thuds with much less intensity. And I suspect the biggest clue is that it thuds on a regulare basis. I timed it a few times and it thudded every 28 to 38 seconds. After running another 12 miles at 1500 RPMs it just stopped thudding and began to run normal. I then put it through different speed ranges for the final 3 mile run in and everything seemed normal.
Anybody have any ideas what was causing the noise?
At cruising speed the thud is really noticable. When I first heard it I thought I bumped something solid in the water. Then not knowing what to do I reduced speed to 5 knots and 1500 RPM. At this speed it thuds with much less intensity. And I suspect the biggest clue is that it thuds on a regulare basis. I timed it a few times and it thudded every 28 to 38 seconds. After running another 12 miles at 1500 RPMs it just stopped thudding and began to run normal. I then put it through different speed ranges for the final 3 mile run in and everything seemed normal.
Anybody have any ideas what was causing the noise?