[Alberg30] Re: Engine pages, propellers

[Mike Lehman]

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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