Yanmar 2GM intermittent low power - Page 2 - SailNet Community
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post #11 of 22 Old 06-25-2007
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absolutely. I had the same problem on the same engine. Sounds exactly like the problems that I had. Do yourself a favor. Replace it. It is easy if you remove the 4 bolts on the exhaust manifold, the elbow comes with it and the change the elbow out on a workbench.
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post #12 of 22 Old 06-25-2007
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Before you start spending $100s on engine parts. Change the Racor Filter. Remember, it's your primary filter. White smoke could be a sign of water in the fuel. When you go to the store to get the filter, ask them for a fuel additive to eliminate the water. It's only a couple of bucks.

You'll have to bleed again all the way to the input of the injector pump as you've done once already.

99% of the time, these two steps will correct the problem. If it doesn't then you can expand the diagnosis area and head for that mixing elbow.

Rick in Florida
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post #13 of 22 Old 06-25-2007 Thread Starter
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thanks for all of the advice. I will change out the racor tomorrow, and if that doesn't do it, look at the elbow!
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post #14 of 22 Old 06-26-2007 Thread Starter
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As the boat is an hour drive away - have a couple of questions before I go:

My racor (don't know the model #) has the clear glass, with the drain at the bottom. I never looked at it very closely, just enough to see the fuel looked clear - boat is new to me - Could it just be a water separator, or do the clear ones always have a filter as well (I assume in the housing above the clear glass)

I called a local boat dealer, but they don't stock racor filters. They said to tyr a local auto parts store - they could cross reference the filter, and give me something similar. Does taht sound right? There are no marine diesel shops nearby!
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post #15 of 22 Old 06-26-2007
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Just asked a similar question a while ago...

See link below to determine what filter you have.
MARINE FUEL FILTRATION

Where do you live - if in Northeast - try Mack Boring. Would strongly recommend you get from a marine supplier rather than auto parts - although a more informed person would be able to tell if auto and marine filter is the same.

To answer your first question - the filter is above the clear glass. The clear bottom is for seeing the water - water is heavier than diesel so would show seperation at bottom.
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post #16 of 22 Old 06-26-2007
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Waste (West to the uninitiated) Marine sells the Racor filters.

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post #17 of 22 Old 06-26-2007 Thread Starter
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great link - Thanks very much. I am having computer issues, and couldn't search for Racor filters.

I am pretty sure mine is the 120 Series RMAM (diesel spin-on).
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post #18 of 22 Old 06-26-2007
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Quote:
Originally Posted by SailorMitch
Waste (West to the uninitiated) Marine sells the Racor filters.
aka Worst Marine
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post #19 of 22 Old 06-26-2007
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If you go to an auto parts store, go to one that serves a lot of trucks. Diesel fuel filters and gasoline filters are vastly different. I buy my primary filters from a Caterpillar dealer---never had a problem.
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post #20 of 22 Old 06-26-2007 Thread Starter
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Found the problem - after changing out the very clean racor filter, and re-bleeding - turned out that it was the transmission not going all the way into forward. I noticed that the propeller shaft turned faster in reverse, than in forward, and the engine sounded / worked better. The transmission shifter pulls back for forward, and although the cable was pulling teh lever back, it was pulling it back and up as well - because of the cable mount / angle.
When I push the transmission lever, with my hand, it clunks into gear and immediately goes faster. I jmoved teh cable mount a little lower, so it pulls more back , than back and up, and it helped some, but I still have to fine tune it. Now, when I shift into forward, it takes a few seconds of revving up, before it clunks, and goes hard into forward. I think I need to play around with the cable adjustments.

At least I know what the problem is, and I learned alot about the fuel system!
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