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 Post subject: Westerbeke 40 50 differences
PostPosted: 04 Oct 2017 12:22 
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Rail Meat

Joined: 03 Jul 2017 11:52
Posts: 17
Can someone speak to the differences between the Westerbeke 40 and 50 installs in our boats? I have the 40 and just wondering if the 50 is a compatible and direct replacement and if not, what differences exist between them. Same transmission? Wiring harness? Other thoughts?

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 Post subject: Re: Westerbeke 40 50 differences
PostPosted: 04 Oct 2017 13:51 
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Grinder

Joined: 16 May 2009 08:06
Posts: 76
From what I have read, nothing is a direct swap with a W-50. The engine mount plane and the center line of the propeller shaft are different. However, the issue has always been swapping out the W-50 and installing something else which required cutting the engine sump down and glassing in a new mounting platform. If you are swapping in the W-50, I guess you would be building the platform up and that should be pretty easy (through bolting a length of 2X3 for example). There may even be enough adjustment in the motor mounts to accommodate. Ray has a lot of experience with this and maybe he will weigh in.


 
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 Post subject: Re: Westerbeke 40 50 differences
PostPosted: 04 Oct 2017 13:54 
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Rail Meat

Joined: 03 Jul 2017 11:52
Posts: 17
Thank you for the info!

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 Post subject: Re: Westerbeke 40 50 differences
PostPosted: 07 Oct 2017 11:41 
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Skipper

Joined: 14 Jul 2012 20:36
Posts: 218
Here's the data spec sheets for the W40 and W50, both mounts 18" wide and motor mounts down 1.12" from centerline of the crank. I wouldn't think Tartan had different motor pans/bed plate for the different motors used. W30 has same mounts.

https://www.westerbeke.com/advanced%20specs/w40.pdf

https://www.westerbeke.com/advanced%20specs/w50_2.pdf

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 Post subject: Re: Westerbeke 40 50 differences
PostPosted: 08 Oct 2017 18:33 
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Skipper

Joined: 29 Dec 2006 09:38
Posts: 426
I do not believe you are reading the spec sheet correctly. The distance between the bed and the output of the Hurth transmission is not 1.12. There are several transmissions on this diagram and no direct reading of what the Hurth transmission offset would be that I can see. But I computed it to be something like 1.52 if I remember correctly. Anyone cutting down the bed to install another motor (not as difficult a job as it sounds) should cut it an inch or so lower as you will need room to shim and you can always shim up, but you cannot shim down. The Westerbekes were unique with this arrangement—most replacement marine diesel transmissions will exit at the same height as the engine mounts.

Ray Durkee
Velera


 
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