You can download Yannmar manuals here.
motoren.ath.cx: Yanmar motoren, motors engine | manual download
I just signed a Purchase & Sales agreement on a Pearson 28 with a Yanmar 2GM20F, and was looking for similar info. I haven't done a detailed search, but I found a thread on sailboat owners that says only the raw water cooled version (2GM20) has a zinc.
Engine zincs in Yanmar 2GM20F ? [Archive] - SailboatOwners.com
sailing a P28-1 Heart of Gold on Narragansett Bay
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