Posted by Bob (rweeks6508@…>)
And not Good Vibrations! Has anyone experience vibrations around 1800 RPM and once in the 2000’s it goes away…Bob
Posted by captainkinsey@… (captainkinsey@…)
Bob,Check the alignment of your prop blades and wear on your cutlass bearing when you are hauled.Regards,Andrew Kinsey Sent from my Verizon Wireless BlackBerryFrom: Bob <rweeks6508@…>Date: Mon, 11 Aug 2008 15:25:49 -0500 (CDT)To: <FreedomOwnersGroup@yahoogroups.com>Subject: [FreedomOwnersGroup] Vibrations - Diesel?? And not Good Vibrations! Has anyone experience vibrations around 1800 RPM and once in the 2000’s it goes away…Bob
Posted by michel.capel (michel.capel@…>)
Also check your engine mounts and the flexible coupler between
gearbox and prop shaft.
In my case, the propshaft started shaking at 1500 revs. I found that
of the eight bolts in the rubber coupler disk, four had lost their
nut (threads on the bolts were worn away) and two bolts had sheared
off.
Note that it’s sometimes hard to notice a broken engine mount. You
really have to use force and lift the engine with a bar to see if the
rubber of the engine mount is still intact.
Good luck
Michel
— In FreedomOwnersGroup@yahoogroups.com, Bob <rweeks6508@…> wrote:
And not Good Vibrations! Has anyone experience vibrations around
1800
RPM and once in the 2000’s it goes away…Bob
Posted by Bob (rweeks6508@…>)
I have a PropSaver installed and I have checked all the bolts and tighten them all. The only thingsI have not done are check the mounts and run the engine in neutral at 15-1800 RPM to see if the prop or shaft has anything to do with the vibration.Will a slight misalignment causing this kind of vibration?BobOn Tue, Aug 12, 2008 at 2:28 AM, michel.capel wrote:Also check your engine mounts and the flexible coupler between gearbox and prop shaft. In my case, the propshaft started shaking at 1500 revs. I found that of the eight bolts in the rubber coupler disk, four had lost their nut (threads on the bolts were worn away) and two bolts had sheared off. Note that it’s sometimes hard to notice a broken engine mount. You really have to use force and lift the engine with a bar to see if the rubber of the engine mount is still intact. Good luck Michel — In FreedomOwnersGroup@ yahoogroups. com, Bob <rweeks6508@ …> wrote: > > > And not Good Vibrations! Has anyone experience vibrations around 1800 > RPM and once in the 2000’s it goes away… > > Bob >
Posted by Robert (robert@…>)
Bob
Is the vibration something that suddenly
started or became more pronounced over a period of time?
Misalignment is unlikely to cause vibration
unless it is so severe the propeller shaft touched the stuffing box or shaft
log. Over time though it may wear your cutless bearing and allow the shaft to
flex and wobble in the bearing.
Yanmar mounts also do not help, check your starboard
side engine mounts, they may be starting to swell or delaminate. These are the
mounts that usually fail first as they are subject to diesel contamination
through leaks or spillage when servicing or bleeding your fuel system. When
one mount starts to fail, then the weight is transferred onto the other mounts
and a vibration oftern occurs.
Running the engine in neutral at the dock may
help you isolate the problem area, you really need to disconnect your propeller
shaft to make this a really effective test.
Bob
From:
FreedomOwnersGroup@yahoogroups.com [mailto:FreedomOwnersGroup@yahoogroups.com] On Behalf Of Bob
Sent: Tuesday, August 12, 2008
9:26 AM
To:
FreedomOwnersGroup@yahoogroups.com
Subject: RE: [FreedomOwnersGroup]
Re: Vibrations - Diesel??
I have a PropSaver
installed and I have checked all the bolts and tighten them all. The only
thingsI have not done are check the mounts and run the engine in neutral
at 15-1800 RPM to see if the prop or shaft has anything to do with the
vibration.
Will a
slight misalignment causing this kind of vibration?
Bob
On
Tue, Aug 12, 2008 at 2:28 AM, michel.capel wrote:
Also
check your engine mounts and the flexible coupler between
gearbox
and prop shaft.
In my
case, the propshaft started shaking at 1500 revs. I found that
of the
eight bolts in the rubber coupler disk, four had lost their
nut
(threads on the bolts were worn away) and two bolts had sheared
off.
Note
that it’s sometimes hard to notice a broken engine mount. You
really
have to use force and lift the engine with a bar to see if the
rubber
of the engine mount is still intact.
Good
luck
Michel
— In
FreedomOwnersGroup@
yahoogroups. com, Bob <rweeks6508@ …> wrote:
And not Good Vibrations! Has anyone experience vibrations around
1800
RPM
and once in the 2000’s it goes away…
Bob
\
Posted by Brien Barnewolt (bbarnewolt@…>)
Bob-Running the engine in neutral to 1500-1800 RPM is an important part of the test. If the vibration is not present when in neutral, concentrate on transmission, coupler (loose), shaft (bent), bearing (loose) and prop (fouled). If vibration is present while in neutral, think motor or motor mounts. Agree with Michael that a broken motor mount can be difficult to see.
Good luck.BrienOn Tue, Aug 12, 2008 at 9:25 AM, Bob <rweeks6508@…> wrote:
I have a PropSaver installed and I have checked all the bolts and tighten them all. The only thingsI have not done are check the mounts and run the engine in neutral at 15-1800 RPM to see if the prop or shaft has anything to do with the vibration.
Will a slight misalignment causing this kind of vibration?
Bob
On Tue, Aug 12, 2008 at 2:28 AM, michel.capel wrote:Also check your engine mounts and the flexible coupler between
gearbox and prop shaft. In my case, the propshaft started shaking at 1500 revs. I found that
of the eight bolts in the rubber coupler disk, four had lost their nut (threads on the bolts were worn away) and two bolts had sheared
off. Note that it’s sometimes hard to notice a broken engine mount. You
really have to use force and lift the engine with a bar to see if the rubber of the engine mount is still intact.
Good luck Michel
— In FreedomOwnersGroup@ yahoogroups. com, Bob <rweeks6508@ …> wrote:
And not Good Vibrations! Has anyone experience vibrations around
1800 > RPM and once in the 2000’s it goes away…
Bob >
\
Posted by Sward (swardfullsail@…>)
I have the same problem. I hauled out a couple of years ago because of that, but I couldn’t find the problem and a couple of years later I had the engine and shaft replaced and cutless bearing worked on, and it still does it. Can’t imagine what it could be?
“Life is a Reach, then you Jibe”
SWARD— On Tue, 8/12/08, Bob <rweeks6508@…> wrote:
From: Bob <rweeks6508@…>Subject: RE: [FreedomOwnersGroup] Re: Vibrations - Diesel??To: FreedomOwnersGroup@yahoogroups.comDate: Tuesday, August 12, 2008, 9:25 AM
I have a PropSaver installed and I have checked all the bolts and tighten them all. The only thingsI have not done are check the mounts and run the engine in neutral at 15-1800 RPM to see if the prop or shaft has anything to do with the vibration.
Will a slight misalignment causing this kind of vibration?
Bob
On Tue, Aug 12, 2008 at 2:28 AM, michel.capel wrote:
Also check your engine mounts and the flexible coupler between
gearbox and prop shaft.
In my case, the propshaft started shaking at 1500 revs. I found that
of the eight bolts in the rubber coupler disk, four had lost their
nut (threads on the bolts were worn away) and two bolts had sheared
off.
Note that it’s sometimes hard to notice a broken engine mount. You
really have to use force and lift the engine with a bar to see if the
rubber of the engine mount is still intact.
Good luck
Michel
— In FreedomOwnersGroup@ yahoogroups. com, Bob <rweeks6508@ …> wrote:
And not Good Vibrations! Has anyone experience vibrations around
1800
RPM and once in the 2000’s it goes away…Bob
Posted by michel.capel (michel.capel@…>)
Yes, misalignment causes vibration, but not in neutral b(that is:
with the propshaft not turning). And (sudden) misalignment is not a
cause, but a result of something. Misalignment often comes up when an
engine mount shears.
— In FreedomOwnersGroup@yahoogroups.com, Bob <rweeks6508@…> wrote:
I have a PropSaver installed and I have checked all the bolts and
tighten them all. The only thingsI have not done are check the
mounts
and run the engine in neutral at 15-1800 RPM to see if the prop or
shaft
has anything to do with the vibration.Will a slight misalignment causing this kind of vibration?
Bob
On Tue, Aug 12, 2008 at 2:28 AM, michel.capel wrote:
Also check your engine mounts and the flexible coupler between
gearbox and prop shaft.In my case, the propshaft started shaking at 1500 revs. I found that
of the eight bolts in the rubber coupler disk, four had lost their
nut (threads on the bolts were worn away) and two bolts had sheared
off.Note that it’s sometimes hard to notice a broken engine mount. You
really have to use force and lift the engine with a bar to see if
the
rubber of the engine mount is still intact.Good luck
Michel
— In FreedomOwnersGroup@ yahoogroups. com
<mailto:FreedomOwnersGroup@yahoogroups.com> , Bob <rweeks6508@ …>
wrote:And not Good Vibrations! Has anyone experience vibrations around
1800
RPM and once in the 2000’s it goes away…
Bob<mailto:FreedomOwnersGroup@yahoogroups.com>
Posted by michel.capel (michel.capel@…>)
Sward, Bob,
If your engine mounts are okay, I’d say your engine is misaligned. Or
did you check that when the shaft was replaced?
What springs to my mind: sometimes the installer uses engine mounts
that are a bit too light (or the rubber too soft) for the engine.
They do this because smaller mounts are easier to install. For the
first couple of years, this is fine. But when the rubber in the
mounts gets tired, vibration sets in without a clear cause in the
drivetrain and with all mounts intact. I think it’s wise to check the
engine manufacturers specs for the engine mounts.
— In FreedomOwnersGroup@yahoogroups.com, Sward <swardfullsail@…>
wrote:
I have the same problem. I hauled out a couple of years ago
because of that, but I couldn’t find the problem and a couple of
years later I had the engine and shaft replaced and cutless bearing
worked on, and it still does it. Can’t imagine what it could be?“Life is a Reach, then you Jibe”
SWARD
— On Tue, 8/12/08, Bob <rweeks6508@…> wrote:
From: Bob <rweeks6508@…>
Subject: RE: [FreedomOwnersGroup] Re: Vibrations - Diesel??
To: FreedomOwnersGroup@yahoogroups.com
Date: Tuesday, August 12, 2008, 9:25 AMI have a PropSaver installed and I have checked all the bolts and
tighten them all. The only thingsI have not done are check the
mounts and run the engine in neutral at 15-1800 RPM to see if the
prop or shaft has anything to do with the vibration.Will a slight misalignment causing this kind of vibration?
Bob
On Tue, Aug 12, 2008 at 2:28 AM, michel.capel wrote:
Also check your engine mounts and the flexible coupler between
gearbox and prop shaft.In my case, the propshaft started shaking at 1500 revs. I found
that
of the eight bolts in the rubber coupler disk, four had lost their
nut (threads on the bolts were worn away) and two bolts had sheared
off.Note that it’s sometimes hard to notice a broken engine mount. You
really have to use force and lift the engine with a bar to see if
the
rubber of the engine mount is still intact.Good luck
Michel
— In FreedomOwnersGroup@ yahoogroups. com, Bob <rweeks6508@ …>
wrote:And not Good Vibrations! Has anyone experience vibrations
around
1800
RPM and once in the 2000’s it goes away…Bob