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I have a bad vibration and knocking when I put boat in

Customer Question
drive. Hit a stump in...
I have a bad vibration and knocking when I put boat in drive. Hit a stump in water after that is when it started this.
Submitted: 1 year ago.Category: Boat
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Customer reply replied 1 year ago
I can see the drive shaft vibrating where it goes through transom. p.m.
Answered in 9 minutes by:
5/30/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,412
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hi Kevin, my name is Jason.

I read what you wrote, how is it I can help you, what kind of questions did you have?

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Kevin, it looks like you read my reply and logged off, did you still need help with your issue?

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Customer reply replied 1 year ago
What could the problem be? The boat would barely move in the water thought it was the prop clutch. I replaced it but did not fix the problem. I had boat out of water and started it in natural and it knocks real bad.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

When you say you replaced the prop clutch. Are you talking about the clutch inside of the lower unit? Did you open up the lower unit and remove the propeller shaft to access this clutch? Or are you talking about the hub that is inside of the propeller?

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Customer reply replied 1 year ago
The hub clutch.could it b the u joint or bearing? No have not taken the lower unit apart. Not sure where to start new boat owner.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Are you near the boat now? And is the boat in the water, or on a trailer?

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Customer reply replied 1 year ago
Not near boat on trailer.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

The most common problem that happens when ever there is a strike is the propeller shaft will bend. When the shaft bends, that throws everything out of balance. The specification on what is allowable is 0.010 of an inch. To word that, that is ten thousandths of one inch. What you want to do is kneel down next the propeller, and spin it by hand. If you can see any wobble at all in the end of that shaft then it will be bent by more than 0.010 of an inch, and it will need to be replaced. Does that all make sense to you?

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

I think that should do it. But I work for tips so I do want to make sure you are happy with my service before you go. If you had a further question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the star you wish and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.

Questions do not close out, so if you have to come back later on with follow up questions to the issue you still can even after doing a rating.

Thank you

Jason

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Customer reply replied 1 year ago
Thanks for the help. But I guess ill just have to tar into it. I do machine work for a living and some repair work. It ha a hard ***** *****ke u joint out or bent drive shaft. Almost like broken connecting rod but motor runs fine.it knocks in neaurtural so it has to be before let goes in lower unit.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

it knocks in neaurtural so it has to be before let goes in lower unit.

Not necessarily. When the stendrive is in neutral, the input shaft, and vertical driveshaft are always spinning, as is the pinion, forward and reverse gears. The only thing that is not spinning is the propeller shaft. However, depending on how the drive is angled, you can hear the clutch which is attached to that propeller shaft bounce around a little bit. Were you able to have another look at the boat since we last spoke?

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Kevin, just checking in. Have you had a chance to have a look at the lower unit?

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Jason
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,412
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Experience: Degree in Marine Technology. Gas and diesel marine mechanic.

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