| Title: | SAILING |
| Notice: | Please read Note 2.* before participating in this conference |
| Moderator: | UNIFIX::BERENS |
| Created: | Wed Jul 01 1992 |
| Last Modified: | Mon Jun 02 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2299 |
| Total number of notes: | 20724 |
Is there a note in this conference that discusses shaft
allignment -- how to do it? If not, does anyone have any
thoughts on this problem:
We replaced the shaft, prop, and strut aboard the boat on
which I race. This was done because we clobbered some
submerged object last year and subsequently developed a
vibration.
The new components installed very easily, and the shaft is well centered.
After lauching the boat, we set about aligning the shaft with the
engine -- seemingly not too difficult as everything is in line and
fairly accessable. After matching the face of the engine flange to
the shaft flange, we pushed the two together and ran a .004-in feeler
guage in between and 360 degrees around to find tight spots. We adjusted
for and aft allignment in both the the vertical and horizontal
planes until the gauge moved with equal friction thru-out the
circumference. At this point, we bolted the flanges together
and fired the engine up. Ran smooth in reverse, but forward
was a night-mare. The vibration even translated into fore-and-aft
oscilation of the shaft.
We went through the same procedure 3 times, and three times
we got the same results. Yes, we rotated the shaft
to ensure allignment for all possible flange match ups.
Someone even went in the drink to visually verify that
the prop was opening and closing properly, which it was.
Any suggestions? We're loath to think the problem is internal to
the transmission. Are we missing some key step in the process?
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 844.1 | Let the pro's do it | AKOV12::DJOHNSTON | Mon May 23 1988 14:49 | 7 | |
We did pretty much the same thing. My suggestion would be to have
it done professionally. So much damage can be done in a short time
with a shaft out of line. You can end up pulling out all your hair
in frustration trying to do it yourself.
dave
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| 844.2 | 3D::GINGER | Tue May 24 1988 15:16 | 15 | ||
Your description of using the feeler gage sounds correct. It does
require some 'feel' but I assume you developed that, particularly
if all sounds well in reverse.
You noted checking to see if the prop 'opens and loses' correctly.
I assume this means its a folding prop. I assume also its not the
same one that you hit the object with that started all the problem?
has it been checked for balance or bend?
One cauiton- couplings always have a boss and socket arrangement
to hold them in axial alignment. If you are forcing them into
alignement, then checking with the feeler, you are not getting an
accurate check. The coupling must slide together without binding,
THEN have the flanges exactly parrallel.
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| 844.3 | DELNI::FACHON | Tue May 31 1988 11:34 | 6 | ||
Shaft alligned. We had not compensated for fact that
shaft was free floating in stuffing box, thus literally
hanging from strut -- not balanced.
Thanks for input.
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| 844.4 | Engine Mountings & Prop shaft Grumbles | SHIRE::MEYER | Nick, DTN 7-821-4172 | Mon Jul 22 1991 10:21 | 21 |
I have a wee problem on my 25 footer that I would be grateful if I
could get some hints from all you sailing gurus.
When I start my 9HP Yanmar diesel & start engaging Fwd or Rev at low
rev, I get awful graunching vibration from the prop shaft. If I
increase revs, the noise goes away, If I stop the engine as the prop
shaft slows down I get this noise again.
A neighbour on my Pier mentioned that my engine mounts (6 yrs old) may
have settled & that I may have to raise my engine on the rubber mounts.
I've looked at the mountings & I can adjust engine height & lateral
positioning.
Please let me know if you think that engine mountings adjustments is
the cure, & how do I know that I have moved the engine to the right
position, as raising the engine a centimetre all round at a time, may
not be the most scientific way of guesstimating the right position....
Many thanks,
Nick
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