GL: Zincs on a Perkins 6.3544M???????

[Ken Bloomfield]

FWIW, on my Perkins T6-354 I do have zincs.  They are in the 
heat-exchange/header assembly.  There is only one zinc per engine there. 
While it is true that the block is totally isolated from seawater, the heat 
exchanger itself "feels" the water, and thus the one zinc.  In fact, I just 
replaced mine, which were down to "nubs".  My engine also has some 
additional zincs that a prior owner installed.  He cut the seawater lines 
just prior to the engine, and installed some bronze fittings with a zinc in 
each (one fitting per engine) and a ground wire to the common DC negative 
bonding strip.  Any stray current coming up the water from the intake would 
first be galvanically "satisfied" with the zinc prior to getting to the heat 
exchanger and eating the walls out or the tubes inside.  I don't know what 
the differences in the 6-3544M are, but I would have thought that the heat 
exchanger itself would have needed some protection.
Ken.
MTOA 2062


----- Original Message ----- 
From: "Ron Rogers" <rcrogers6@kennett.net>
To: "Jim Ague" <ague@usa.net>; "Great Loop" <great-loop@lists.samurai.com>
Sent: Thursday, March 08, 2007 6:43 PM
Subject: Re: GL: Zincs on a Perkins 6.3544M???????


> Same here. I was told that the exhaust manifold gasket isolates it, but 
> what
> about the bolts? I guess it is as you say, saltwater is isolated and that
> impedes galvanic corrosion.
>
> Ron Rogers
>
> ----- Original Message ----- 
> From: "Jim Ague" <ague@usa.net>
>
>
> |>  Our boat is a Monk 36 with a Perkins 6.3544M
> | > engine.  Question is...where is/are the pencil zincs on this engine
> | > if in fact there are any at all?  Thanks in advance.
> |
> | Our 1994 Monk 36 had the same engine. No zincs on it. Something about 
> the
> | way the heat exchanger isolates that salty water from the engine block.
> The
> | only zincs I ever changed on the Monk were the transom zinc,  pair on 
> the
> | prop shaft zinc, and the gen.
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