Scott wrote:

Don (and Ian),
I'm away from my boat and it's 3GM30F manual, but two things . . . .
First, I know that my 30GM30F is the fresh water version with heat
exchanger, and it has no zincs. However, I am pretty sure that the manual
describes procedures for replacing zincs in the sea water cooled version.
Yanmar has an online forum and help desk which I have found useful,
Yanmarhelp.com.

Good luck,
Scott
Yep, Yanmarhelp is a *very* good forum. I have a PDF copy of the manual
as well as the dead tree version which normally lives onboard so I was
able to check my facts. :-) Cant remember were I found the PDF or I'd
provide a link to it. :-(

--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL:
'Stingo' Albacore #1554 - 15' Early 60's, Uffa Fox designed,
All varnished hot moulded wooden racing dinghy.