[C320-list] Perkins M30 zinc?

[Amshd2]

John

I have Hull #30 with the Perkins.  As far as I know they did not use zincs in our engines.  I have both an operator and shop manual and can not find any reference to a zinc. 

>From what I understand not all makers put them in the engines.     

Tony 






-----Original Message-----
From: Robert Seastream <robert.seastream at comcast.net>
To: C320-List at Catalina320.com
Sent: Thu, Jul 7, 2011 5:51 pm
Subject: Re: [C320-list] Perkins M30 zinc?


I think only raw sea water cooled engines would require zincs mounted somewhere on the engine block. Engines like the 3GM30F which are cooled via a heat exchanger that pumps seawater over the engine water jacket (which is filled with antifreeze/coolant) wouldn't have need for zincs. 
 
Bob 
 
On Jul 7, 2011, at 3:02 PM, Jeff Hare wrote: 
 
> Our Yanmars don't have zincs. Many other engines don't either. One > problem with zincs is they can crumble and damage the engine water > pump. Also if the engine is bonded well to the shaft, these zincs > should do the job. 
> 
> That's my understanding, but there may be different reasons also. 
> 
> -jeff 
> 
> jpmesa at aol.com wrote: 
> 
> 
> 
> I have noticed some of the Yanmar engine owners talk about engine > zincs. I have the older Perkins M30 (Hull #112). 
> I have looked everywhere on the engine and surrounding area and I > haven’t found a zinc. 
> Any other Perkins owners know if we have one? And if not, why? 
> Thanks, John Holokai 2 
>