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  #1   IP: 108.86.240.22
Old 09-15-2016, 10:28 PM
Jim Booth Jim Booth is offline
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reversing gear noise?

We started hearing much louder and lower pitch noise while crossing Lake Michigan to Sheboygan WI, and then from there all the way home to Waukegan IL. About 130 miles. We also feel a lot of vibration. I took some videos so you can hear the noise. I'm wondering if it could be the reversing gear causing all the racket and vibration. It doesn't do it if it's in neutral. The propeller is fine and spins without anything odd.

There are two videos exploring the engine area, and one looking and listening in the lazzarette. It's a Columbia 8.7

[YOUTUBE]HN0ZkY-8bpI[/YOUTUBE]
[YOUTUBE]6HNoDPue4RA[/YOUTUBE]
[YOUTUBE]wkgyLLSRY0A[/YOUTUBE]

The noise is most obvious in the last one.

Thanks,
Jim
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  #2   IP: 68.108.252.118
Old 09-16-2016, 01:27 AM
JOHN COOKSON JOHN COOKSON is offline
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What happens with the noise when you shift into reverse?
Does the noise vary with RPMs in any way?
The vibration + the noise could be something going on with the prop. The first thing I'd do is get a diver under the boat to rule prop problems in or out.

TRUE GRIT
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  #3   IP: 108.86.240.22
Old 09-16-2016, 10:42 AM
Jim Booth Jim Booth is offline
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I inspected the prop from our floating dock with bright sunlight and clear water. I don't see any issue with the prop. I pushed and pulled on it with a boat hook and didn't feel any slop.

I didn't try it in reverse - thought about that on my way home later. What I think I'm hearing is more like the clatter noise reverse always makes. I guess I'll take the cover off and see what I can see.

I can't imagine the prop shaft would be doing it with the bit of vibration it has.

It gets worse with higher rpm. The engine videos were shot at a bit less than normal cruising rpm. The lazerette video was somewhat slower I think.

I changed oil to Mobile 1 4T motorcycle oil before the trip (300 or so miles all together), but of course only about half of the oil gets changed out so it's a blend of dino and synthetic at this point.
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  #4   IP: 32.211.28.40
Old 09-18-2016, 10:17 PM
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Al Schober Al Schober is offline
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Jim,
I'd suggest getting a mechanic's stethoscope and probe around a bit with that. My suspicion is the main bearing at the output of the transmission.
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  #5   IP: 108.86.240.22
Old 09-19-2016, 10:17 AM
Jim Booth Jim Booth is offline
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Hi Al,
I think you're right. I went to the boat yesterday intending to pull the prop shaft out of the coupling so I isolate the noise to the engine. But it didn't slip out easily. So instead I opened up the reversing gear and rotated the shaft by hand, in neutral of course. I had my wife take a couple videos for the sound. It's a little difficult to tell, but between what I could hear and feel, I think the output bearing is bad. I don't know how much of the noise is due to other rotating parts in there. I'll have to read up on replacing it. It's probably just a bearing and a seal? Offhand it looks like I can do this with the motor in the boat, but hoping I don't have to take the whole reversing gear out. Wishful thinking?

Here are the videos. Let me know what you think.

[YOUTUBE]2zT9Hb4RFmU[/YOUTUBE]

[YOUTUBE]tKH9tbk5o2Q[/YOUTUBE]

Jim
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  #6   IP: 108.15.247.139
Old 09-19-2016, 12:18 PM
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Don Moyer Don Moyer is offline
 
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Reversing gear noise?

Jim, if you're referring to what appears to be a clicking sound as you rotate the output coupling back and forth, that is a very normal noise. The stops on each side of the brake band click against the top ledge of the oil pan. If the big ball thrust bearing has failed, you can usually feel some play in the bearing as you tug hard up, down, and sideways on the output coupling. Don
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