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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 07-29-2013
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Loosing rims

I am in the middle of a cruise and twice we have had some trouble with the engine suddenly loosing a couple hundred rpm. I have a yanmar 2 gm. The first time the problem corrected itself after 5 minutes or so. This time were we're in tight and very windy quarters so headed in to a bay to get anchored nice we lost power out in the wind.

I am suspecting a fuel problem, but being fairly new to the boat am not overly familiar with its systems. I replaced the fuel filter about 150 hrs ago, an placed the filter in the water separator about 50 hours ago. It called for a 10 micron but the shop only had 2 micron and they said that would be fine. Not sure if that could be a part of the problem? All parts of the fuel system seem tight.

Any emergency suggestions?

Sorry just saw the title and it should read RPMs!! My iPad changed the spelling!
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Old 07-29-2013
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Re: Loosing rims

10 microns....

and I change mine as needed, but way sooner than 150 hours. Usually at every oil change - 35-45 hours, or as needed when things burp.

water separator filter as needed, but if Drain more than a 1/3 cup of water at a time, it goes as well.

stay away from 2 micron except the last filter before the injector pump, the little tiny one.
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Old 07-30-2013
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Re: Loosing rims

Sure sounds like fuel starvation. Change primary & secondary filters and carry spares. Cut the old filters open and see whats inside.
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Old 07-30-2013
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Re: Loosing rims

If the filters are clean by which I mean blocked up as opposed to off white it's not them.
You are changing them often enough to where unless you are loading bad fuel it should be fine.
I suspect air has gotten into the system, especially as you say you are unfamiliar with the system. Check your manual and do a very thorough bleed all the way to the injectors.
Check the air filter as well.
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Old 08-06-2013
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Re: Loosing rims

By way of a quick update, I checked the new filter in the fuel/water separator and it looked like i had been pulled from a mud puddle! I noticed a fair amount of crud in the bottom of the bowl and suspect it got all mixed up when the boat was in motion and clogged the filter. I cleaned out the bowl thoroughly, replaced the filter and the problem was solved. Motored for 12 hours without so much as sputter!
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