[C320-list] starting effort

[Bill Culbertson]

Scott - thanks for saying what I was going to say re: 3GM.   To be slightly more precise, 3GM refers to the family.  3GM30 is the raw-water version with zincs while 3GM30F is the fresh-water version without zincs.  The zinc/no-zinc stuff is described in the Yanmar GM manual.  If you don't notice the F vs non-F stuff, you can get confused because in some parts it talks about zincs and in other parts it says there are no zincs.  The oddities of the translation into English doesn't help the clarity.

 -bill


----- Original Message ----
From: Scott Thompson <sthompson at toad.net>
To: C320-List <c320-list at catalina320.com>
Sent: Friday, December 1, 2006 7:22:50 PM
Subject: Re: [C320-list] starting effort


The Yanmar 3GM does have zincs, but that's a raw water cooled engine.  
The 3GM30F is the model that was used on 320's until recently and it 
does not have zincs.  There is a plug in the side of the block where the 
zinc would go on a raw water cooled engine, but there's no point in 
putting a zinc into the closed part of a cooling system.

Warren Updike wrote:
> According to my sources, the newer diesel engines sport a higher compression ratio and therefore don't need the assist of glow plugs.  The Perkins M30, being now likely a 15-20+ year old design, has compression ratio of 23:1 which may be lower than the Yanmar which stroke is 14% more than on the Perkins dispite only 1% larger bore.  I couldn't find the actual Yanmar compression ratio.
>
> PS it seems the 3GM does have zincs.  The 3YM apparently does not.  I think it a question of the materials used in the cooling system.
>
> Warren & Pattie Updike
> C320, #62, 1994, "Warr De Mar"
> Frog Mortar Creek, Middle River
> Chesapeake Bay
>


 
____________________________________________________________________________________
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail beta.
http://new.mail.yahoo.com