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Old 05-09-2010, 06:33   #1
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Need a New Shaft ?

When I got my boat it had a pronounced knock. I had the motor aligned and it is much better but not perfect(especially when I turn sharply). The cutlass bearing has about 1/16 inch wiggle. Do you think I need to get the shaft redone or wil the cutlass bearing replacement do the job?
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Old 05-09-2010, 06:48   #2
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If the boat is in the water, I'd just start with a bearing replacement and see what that gets you. If you're out of the water, I'd go ahead and pull the shaft and take it to a prop shop to be checked. They should be able to straighten it if needed. You probably don't need a new one.
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Old 05-09-2010, 06:51   #3
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Once you pull the shaft to change the cutlass bearing, you will be able to inspect the area that the bearing contacts for wear or damage.
Don't ask me how I know this.
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Old 05-09-2010, 06:54   #4
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And if that doesn't work, check out this thread.

Installing a 3JH4E *^%#! Yanmar (Rant)
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Old 05-09-2010, 08:14   #5
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If you can turn the shaft by hand you will be able to say if it is true. If the bearing is gone, replace. But if the shaft is bent, then you might need a new one (I am not sure they can be made true in a garage).

If the knock comes only when turning then make sure the support strut (if you have one) is stiff enough and gives the shaft good lateral support.

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Old 05-09-2010, 08:46   #6
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I assume you have checked your engine mounts.
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