Yes, you should use something like Nickel Anti-Seize.
On the front of the 2QM15 there is a 3-way joint where a zinc plug screws into.
This 3-way is no longer available from Yanmar (3-way joint (724070-0130).
For galvanic protection, I would NOT use liquid gasket or lock tight.I
researched this years back and came across a recommendation to use a nickel or
marine grade anti-seize. Regular anti seize contains Zinc which may acerbate
the problem. Nickel anti-seize costs only a few dollars extra and one
container will last you a life time.
The first time I tried to replace the zincs on a 2QM15, I found a galled zinc
plug in the 3-way joint. I had to remove and bring the 3-way joint into our
machine shop to get it apart. It took a lot of heat, a big vice, a rather
large pipe wrench with a pipe for extra leverage, and 3 guys(one at a time on
the pipe wench while the others provided advise and jokes). When it finally
came apart, the threads on the plug were wasted. I purchased new a plug, and I
was able to clean up and rethread the 3-way. I owned the 2QM15(29-1) for many
years, and now have a 3QM30, and I am still on my same jug of Nickel anti-seize
with no problems.
-
Paul E.
1981 C 38 Landfall
S/V Johanna Rose
Fort Walton Beach, FL
http://svjohannarose.blogspot.com/
> On Sep 27, 2017, at 10:48 AM, cnc-list-requ...@cnc-list.com wrote:
>
> Date: Wed, 27 Sep 2017 07:12:10 -0700
> From: Chris Hobson <ch...@hobsonbuildsco.com
> <mailto:ch...@hobsonbuildsco.com>>
> To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
> Subject: Stus-List Yanmar 2QM15 - Anti-seize, lock tight, gaskets
> Message-ID: <86d19156-f1a5-4485-b6f9-54dac1c00...@hobsonbuildsco.com
> <mailto:86d19156-f1a5-4485-b6f9-54dac1c00...@hobsonbuildsco.com>>
> Content-Type: text/plain; charset=us-ascii
>
> Currently replacing fuel filters and doing general maintenance on a neglected
> engine. Replacing the zincs, tightening nuts, replacing hoses. And after
> switching out the zinc and tightening the nut I wondered if it should be
> putting a liquid gasket, blue lock tight or anti seize on there. What are the
> must-haves for protecting an engine when taking things apart and putting them
> back together?
>
> Chris Hobson
> S/V Going
> 1980 C MKI
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