[Alberg30] Diesel installation

[Mike Lehman]

Hi Matt,

When I replaced my engine, I also replace my coupling. I used a 
flex-coupling  from Vetus http://www.vetus.com/frame-sea.htm.

Here was my reasoning...

With the old Atomic 4 the engine was :hard mounted" to the boat. As the prop 
pushs on the shaft it exerts force on the engine. With the newer diesel 
engines, the engine is mounted on flexible mounts. As the porp pushes on the 
engine the engine moves forward and tilts forward at an angle changing the 
angle of the shaft-engine. The tolerance on this coupling is .004", so a 
minor change can cause a big change in the coupling angle, hence the need 
for a flex coupling IMHO.

I was on another A30 and watched the new engine under-load move forward by 
1-1/4". This caused excessive wear on the cutlass bearing and other parts. 
The owner had to have the engine remove; replaced the engine mounts with 
stiffer mounts; and have a flex-coupling installed. That convinved me to 
make these changes upon initial installation 6 years ago and it has been 
fine [knock on wood] ever since.

Hope this helps.



Mike Lehman
"Gilleleje" #505





----Original Message Follows----
From: "Matthew Hay" <haymatthew_ at hotmail.com>
Reply-To: Alberg 30 public list <public-list at alberg30.org>
To: public-list at alberg30.org
Subject: [Alberg30] Diesel installation
Date: Wed, 26 Mar 2003 08:11:25 -0500

I am doing preliminary research for installing my new Beta BD722.  A friend 
mentioned that I should remove the prop shaft and have the new coupling 
"fitted and faced" at a prop shop.  Has anyone done this?  What have you 
paid for this?
Thank you,
Matt #314





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