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Bent shaft?

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Kristof View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kristof Quote  Post ReplyReply Direct Link To This Post Topic: Bent shaft?
    Posted: April-22-2014 at 7:44am
Pete, Tim and other specialists...

A video tells more than a thousand words, so I took my smartphone:




So, is my shaft bent?
When I put a long screwdriver next to the shaft (tip pointed on the bilge floor and screwdriver shaft next to prop shaft, for lack of a better explanation by a non-english speaking forreigner )I can see it move back and forth a little (read: half a millimeter)

There is no play whatsoever in the strut, prop looks fine and shaft moves nice and freely (checked alignment last week).
I have a negligeable vibration between 2100 and 2150 RPM (between 30-35 KPH, 19-21 MPH)...

Should I start to panic by now...??



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ny_nautique View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ny_nautique Quote  Post ReplyReply Direct Link To This Post Posted: April-22-2014 at 8:33am
Here's the video:

- Jeff
1999 Ski Nautique
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Kristof View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kristof Quote  Post ReplyReply Direct Link To This Post Posted: April-22-2014 at 10:48am
Oops, sorry, my bad... Edited my post.

Thanks Jeff


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- Money doesn't make one happy, but when it rains cats and dogs, it's still better to cry in a Porsche than on a bicycle...

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phatsat67 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phatsat67 Quote  Post ReplyReply Direct Link To This Post Posted: April-22-2014 at 10:48am
Get a dial indicator Kris. That will tell you for sure and you'll use it again with all your mechanical skill.
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Kristof View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kristof Quote  Post ReplyReply Direct Link To This Post Posted: April-22-2014 at 11:00am
Ha, that's one of the answers I expected Zach

But, before I spend yet more money on the B(reak)O(ut)A(nother)T(housand), what is your opinion on what you see in the video?


- Gun control means: using BOTH hands!
- Money doesn't make one happy, but when it rains cats and dogs, it's still better to cry in a Porsche than on a bicycle...

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phatsat67 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phatsat67 Quote  Post ReplyReply Direct Link To This Post Posted: April-22-2014 at 11:17am
It looks like its moving the shaft log around a bit but that could be inconsistency in the shaft packing? The spec for tolerance in a shaft is .003 or less run out. So its a pretty tight spec but a little room for error.
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8122pbrainard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: April-22-2014 at 8:12pm
Kristof,
I agree with getting the dial indicator out. Besides the shaft, the coupling could be an issue too. Ether with a bad fit to the shaft or a coupling face that isn't running true to the shaft.


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Keep it original, Pete
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Kristof View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kristof Quote  Post ReplyReply Direct Link To This Post Posted: April-23-2014 at 7:15am
So dial indiactor it is... I'll get back to ya

- Gun control means: using BOTH hands!
- Money doesn't make one happy, but when it rains cats and dogs, it's still better to cry in a Porsche than on a bicycle...

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