[Alberg30] Re: Engine pages, propellers

[Scott Wallace]

Mike,

I would concur with you from my experience with British Motourcars...
Another DANGER and HAZARD TO LIFE is that if the vibration is consistent and
the harmonics right, your lockscrew or set-screw on the propeller shaft can
come lose and your propeller SHAFT can come lose and on some boats completely
SLIDE OUT THROUGH THE HULL causing CATASTROPHIC LOSS TO LIFE AND LIMB!

Scott Wallace

Mike Lehman wrote:

> My feeling on this subject is that if you have a hard mounted engine like an
> Atomic 4 then your alignment should be damn close to perfect. If you are
> mounted on flexible mounts, as so many diesels are, then the alignment will
> change between static (neutral) and when there is a load on the engine.
> Since we do not have thrust bearings in our boats, when the engine is
> engaged, in either forward or reverse, the engine moves (slightly) and the
> angle between the engine and drive shaft changes as a result. Therefore I
> believe that it is essential to have a flex-coupling at the shaft to make up
> for the minor angle change. I am no engineer - but this just makes sense to
> me. When I changed my engine 6 years ago (all work done by myself) I bought
> the best flex-coupling I could find and have had smooth operation at all RPM
> levels since.
>
> ----Original Message Follows----
> From: "R.C. Alley" <ralley at chesapeake.net>
> Reply-To: public-list at alberg30.org
> To: <public-list at alberg30.org>
> Subject: Re: [Alberg30] Re: Engine pages, propellers
> Date: Mon, 11 Feb 2002 15:49:46 -0500
>
> I am by no means the house guru on diesel alignments (I've paid for a
> few--does that count??) but I would say that if you have anything like
> significant additional vibration when the engine is in gear (compared to in
> neutral) then you may have a problem that bears looking into.  I had a
> problem with a rear engine mount last year that cost me a new shaft,
> coupling, etc, because, essentially, I didn't know how much vibration was
> too much, and I didn't have it checked out. A stitch in time.....
>
> Rob Alley
> ----- Original Message -----
> From: "Bob Lincoln" <lincoln at cc.UManitoba.CA>
> To: <public-list at alberg30.org>
> Sent: Monday, February 11, 2002 2:12 PM
> Subject: [Alberg30] Re: Engine pages, propellers
>
>  > I have a Bukh diesel and have looked at the engine mounts for some time,
>  > wondering--why do they do shake in the front when running; the back
> mounts
>  > seem to be solid.  They also seem to be non-adjustable, perhaps with
> shims?
>  > On reading the Towney pages on engine removal perhaps all of the engines
>  > were bolted down from the top?  The Yanmars up here all seem to have
>  > adjustable mounts.   I have some engine wedges but have refrained from
>  > messing about with the alignment, other than what was done when I
>  > reinstalled the stuffing box & tube.  Should I bother about this shaking?
>  > Compared to other diesels in the club, mine seems to be no different,
> with
>  > some deck vibration, but not as smooth as the Atomic 4.
>  >
>  > A second note, I bought a new prop this winter from a Vancouver firm
> called
>  > West by North Enterprises.  They have a slim 3-blade design and I went
> with
>  > a 12 x 10.5 x 7/8 shaft RH.  Testamonials from another A30 indicated that
>  > vibration was significantly reduced--my other 2 blade, even repitched
>  > downwards,  is a 13 inch, which seems to leave less than adequate
> clearance
>  > in the aperture and therefore increased vibration--so this summer I am
>  > hoping to have something good to report back on.  A small note, the brass
>  > prop keys seem to be as hard to find as hen's teeth.  Eventually I got
> some,
>  > but what a process!
>  >
>  > PS what a nice winter up here--today it's slightly above freezing.
>  >
>  > Bob Lincoln
>  > Indigo #590
>  > Winnipeg
>  >
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> Mike Lehman
> "Gilleleje" #505
> (410) 544-9067
>
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