Join Date: Dec 2007
Location: Noank, CT
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Re: Identifying a Yanmar
The designation on my 3GM30 name plate is: 3GM30 93.
Engine was installed in 98. Yard mechanic told me that the 93 designated the year when the engine was built. Some on these forums advised that the engine was converted to fresh water which is why there is no "F" on the end of the number.
Turns out all wrong. Another mechanic told me that it was definitely not converted. After speaking with Mack Boring I learned that some individual boat builders had their own model designation put on the engine. In my case, the "F" was deleted from the model number and the "93" was specific to a boat builder. The engine never made it to the builder - probably due to an order cancellation.
I never took the serial number any further to learn who originally ordered the engine or what year it was built.