If it hasn't been replaced it is probably a 3QM30. 3QM30F is fresh water cooled. Mine was raw water cooled. It has a vane type water pump for a circulating pump and another below the alternator for raw water. TOA Marine supply has a table to help you id your engine. Doug MountjoysvPegasusLF38 just west of Ballard, WA. ------ Original message------From: Brian Davis via CnC-List Date: Mon, May 16, 2016 11:45To: cnc-list@cnc-list.com;Cc: Brian Davis;Subject:Stus-List Yanmar 3HM or 3QM Hi all, Hope your weekend was sunny and breezy like mine in south FL. I'm trying to determine exactly which Yanmar is in my 1980... Does anybody have the same and knows the difference? Thanks and regards, -- Brian Davis1980 C&C Landfall 38"Nina" Virus-free. www.avast.com
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