Rick,
Yanmar has recommended straight weight oils for a long time. You can still buy 30 weight diesel oil, but it is getting hard to find. I use Rotella 15W-30 in my Yanmar and have been very happy with it. I remember a long time ago some issue about running non-detergent oil in some engines (i.e. straight weight), but can't recall the reason. It may have something to do with the filtering. Jake Jake Brodersen "Midnight Mistress" C&C 35 Mk-III Hampton VA From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Rick Brass via CnC-List Sent: Monday, December 15, 2014 9:30 PM To: cnc-list@cnc-list.com Subject: Stus-List Yanmar 2GMF13 parts help A friend bought a 1983 model C&C with a Yanmar 2GMF13, serial number 05337. The engine has run great during the delivery to North Carolina, so I have no issues at the moment. But I am trying to help my friend get set up with parts and get any maintenance oversights by the PO taken care of. Is there any way to figure out the age of the engine based on the serial number? I have an Operating/Maintenance manual for the engine, along with an aftermarket service manual of somewhat dubious quality. Yanmar doesn't appear to put the parts manual on line for easy access. Does anyone know where I can find a PDF version of a parts manual? Or a real Yanmar service manual? The maintenance manual shows a cooling system zinc in the back of the engine, and calls for replacement every 250 hours. I found a part number of 27210-200300 on the Mack Boring site, and that looks like a Yanmar part number. Does anyone know if it is correct? And I seem to recall conversation about there being two zincs on the Yanmar marine engines. Is there another zinc that should be replaced? An oil and filter change is high on the maintenance list. The Yanmar manual calls for straight 30 or 40 weight oil. I've only ever used Rotella 15-40 in diesel engines. Is there something about the engine that makes a single viscosity oil essential or preferable to a multi-grade oil? Maybe the small (only 2 liter) oil capacity? Rick Brass Imzadi C&C 38 mk 2 la Belle Aurore C&C 25 mk1 Washington, NC
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