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post #1 of 4 Old 05-25-2015 Thread Starter
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Yanmar 2GM20F Maintenance

Hello Forum, I am a newbie - just bought a '79 Catalina 27'. The original engine was a Petters (sp?) and it currently has a Yanmar 2GM20F inboard diesel. I've heard the engine is worth more than the boat. Ha!

At any rate, I have scoured the web, and am not finding any kind of a simple maintenance checklist. I am not one to be very mechanically inclined, though I have successfully replaced the impeller, mixing elbows in order to resolve engine overheat.

The previous owner did not sail her very often and as such, I want to start fresh with all of the maintenance needs so I have a base level and feel comfortable with any upkeep going forward.

Any ideas of what book or guide or manual I can rely on for upkeep?
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post #2 of 4 Old 05-25-2015
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Re: Yanmar 2GM20F Maintenance

Do you have the Yanmar manual? It covers the basic maintenance and operation pretty well. Note the manual is not just for the 2GM but also covers the 1GM, 3GM, etc. And a generic book on marine diesels (like one of the Clymer books) would be helpful.

Here's a source for Yanmar engine books.


Last edited by JimsCAL; 05-25-2015 at 11:19 AM. Reason: added link to MDD
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post #3 of 4 Old 05-25-2015
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Re: Yanmar 2GM20F Maintenance

go to L-36.com. They probably have a manual in the Manuals section.

As for maintence, change the impeller and fuel filters annually, oil every 50 hours, keep the fuel clean. It will outlast both of us if cared for.

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post #4 of 4 Old 05-25-2015
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Re: Yanmar 2GM20F Maintenance

How many hours on the engine?
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2gm20f , diesel , engine , inboard , yanmar

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