[C320-list] Yamar engine fuses and other questions

[Karl Mielenhausen]

On hull 690, the fuel tank is an Ezell Model E252-19 made fom .090"
5052 aluminum....
http://www.catalina320.com/mediagallery/media.php?f=0&sort=0&s=20110402165510868

Aluminium alloy 5052 contains nominally 2.5% magnesium & 0.25%
chromium. It has good
workability, medium static strength, high fatigue strength, good
weldability, and very good corrosion
resistance, especially in marine atmospheres. It also has the low
density and excellent thermal
conductivity common to all aluminium alloys. It is commonly used in
sheet, plate and tube form.
5052 has the same high resistance to general corrosion as other non heat
treatable aluminium alloys. It also has the higher resistance to
slightly alkaline conditions common
to the 5000 series alloys. The resistance of 5052 to corrosion in
marine atmospheres is excellent,
exceeding that of 5005, hence the frequent use of 5052 in marine applications.
The corrosion resistance of aluminium alloys relies on a protective
surface oxide film, which when
damaged is readily repaired by the rapid reaction between aluminium
and oxygen. However, the
high reactivity of the base metal can give rapid corrosion if the film
cannot be repaired, so
aluminium alloys are not suitable for use with reducing media. 5052
can be anodised to improve
the corrosion resistance by thickening the protective surface film.

Probably more than you wanted to know!!

Karl

On Mon, Nov 4, 2013 at 12:42 PM,  <millers1 at aol.com> wrote:
>
>
> Over the Summer, I collected various C320 site e-mails dealing with issues I felt
> it was better to understand before they might occur:
> My boat is #680,  year 2000:
> On the Yanmar engine fuse discussion, three fuses were identified,  I located the two on
> the Port side of the engine located just behind the alternator and in front of the
> started motor. I have not located the 3rd fuse??? can anyone better describe where it is,
> what cable it is in and is it a two prong fuse (newer style) or the older cylinder looking type??
>
> 2.  One discussion also mentioned fuses in the battery cable lines that
> were pushed up under the shelf
> overhang in the main cabin settee.   I had no luck in locating these either.
> If in the lines.... approx. how far from battery terminal??
>
> 3.  So I do not have to rip out the Starboard Aft locker to see the fuel tank:
> what material is the fuel tank made of ???...... one discussion of a failed tank
> indicated aluminum.
>
> Thanks,
> Art