[C320-list] starting effort

[Scott Thompson]

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
>