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&C 38 Landfall S/V Johanna Rose Fort Walton Beach, FL http://svjohannarose.blogspot.com/ > On Sep 27, 2017, at 10:48 AM, [email protected] wrote: > > Date: Wed, 27 Sep 2017 07:12:10 -0700 > From: Chris Hobson <[email protected] > <mailto:[email protected]>> > To: [email protected] <mailto:[email protected]> > Subject: Stus-List Yanmar 2QM15 - Anti-seize, lock tight, gaskets > Message-ID: <[email protected] > <mailto:[email protected]>> > 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&C MKI
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