Don't go easy with that diesel.. - SailNet Community
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post #1 of 9 Old 3 Weeks Ago Thread Starter
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Don't go easy with that diesel..

Been told numerous times don't go easy with that diesel..

http://www.proboat.com/2015/02/why-y...y-on-a-diesel/
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Re: Don't go easy with that diesel..

Have lived by "Run her hard" since my Yanmar 3 GM was new 31..err 32 years ago.
Change oil/filters early and often.
Often, after extended motoring, I will bring motor to max rpm for minute or so,
and then always idle for while to cool motor down before shutting down.
Original injectors.
Original mixing elbow (check every year and can't believe)
Do a proper flush with Rydlyme every few years, as is raw water cooled.
Exhaust manifold looks new.
And starts without much fuss with my early winter 30-40 degree sailing.
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post #3 of 9 Old 3 Weeks Ago
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Re: Don't go easy with that diesel..

During a day-long diesel class provided by Mack Boring, we were told that sailboaters need to run their diesels long enough to bring them up to temperature. Since that doesn't seem to happen every time a sailboat is used, the recommendation was to--every once in a while--deliberately run the motor for a couple of hours under load. "Run it like a powerboat!"

Power boaters typically don't have this issue of short run times.
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post #4 of 9 Old 3 Weeks Ago
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Re: Don't go easy with that diesel..

It does seem, from the article, that you don't need to run it too long at higher power settings to gain the benefit. I think Mr. D'Antonio said 15 minutes for every 4 hours of operation. He said to run it at 75% power setting during this 15 minutes.

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Re: Don't go easy with that diesel..

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It does seem, from the article, that you don't need to run it too long at higher power settings to gain the benefit. I think Mr. D'Antonio said 15 minutes for every 4 hours of operation. He said to run it at 75% power setting during this 15 minutes.
That wouldn't be my take-away from what the author said. At that point, he was talking about power boats that can plane, being operated in an underloaded condition. An example would be a 27ft. Ranger Tug that can plane it's semi-displacement hull with it's 220 horse Volvo diesel, but the operator wants to save fuel by going 7 knots and running with the throttle barely open. If your vessel is grossly overpowered for slow speeds, then at a minimum, you should get her up on plane and put a load on it for a portion of your time.

A 30 foot sailboat with a 20 horse diesel is something else, entirely. If the diesel can provide 6.8 knots at 75% throttle, but the owner wants to save fuel by running at 50% throttle for 5.2 knots, that's an underloaded situation and is easily avoided entirely by just going 1.6 knots faster (75% throttle), and still burning very little fuel.

I keep my Universal M-25xp diesel at about 75% of peak rpm whenever possible. The only exceptions are no wake zones, operating in the marina, etc.. My engine peaks at 3100 rpm, so 75% throttle is just shy of 2400 rpm, so that's about where I keep her whenever possible.

Main take-way from the article? Run that sucker. It's good for it.
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Old biker say'n..."Run it like you stole it.."
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Re: Don't go easy with that diesel..

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Originally Posted by fallard View Post
During a day-long diesel class provided by Mack Boring, we were told that sailboaters need to run their diesels long enough to bring them up to temperature. Since that doesn't seem to happen every time a sailboat is used, the recommendation was to--every once in a while--deliberately run the motor for a couple of hours under load. "Run it like a powerboat!"
Absolutely correct ... and its for retardation and partial reversal of internal engine 'rust' - all the cooling passages, including the exhaust manifold, heat exchanger, cylinder head, engine 'block', etc.
Why? Heat soaking the cast iron engine by long term operation will begin to turn the destructive 'red' rust back to a more 'protective' formation of black rust.
Internal rusting of the cast iron is what eventually 'kills' a marine engine. The longer you run the engine at its operating temperature, the better; as then, the red rust turns back to the more 'protective' black form of rust.
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post #8 of 9 Old 3 Weeks Ago
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Re: Don't go easy with that diesel..

If you are worried about internal engine rust maybe you should use the right antifreeze!

BTW - not running your engine all the time at real low load doesn't mean to instead always run it at real high load. People should read their manuals.
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Don't blow air up my rear, be useful and blow it at the sails!
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post #9 of 9 Old 2 Weeks Ago
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Re: Don't go easy with that diesel..

My penta MD17D is 32 years old and is not babied at all. It has regular oil changes... and over the years typical maintenance... impellers, belts, hoses, filters and a few pump replacements, new engine mounts... and an alternator upgrade.

Started right up this spring as usual. Probably outlast me... :-)

Last edited by SanderO; 2 Weeks Ago at 07:00 AM.
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