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Old 08-20-2012
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Question Yanmar 2GMF problems

First admission: other than changing oil, we have not been too good with our diesel. The boat has also not had much use this summer (about 5x total).

The hull is scummy, but not encrusted, so we know that the hull is not the whole problem. A few barnacles on the shaft, but nothing more than usual for this time of year.

The problem: About 2 weeks ago, my boat partner went for a little motor cruise and the boat would not go past about 3 knots (normal for us at 2500 RPM is about 4-5 knots).

Yesterday, I got on board and the boat would not accelerate nearly as fast as before. The engine would not go past 2800 RPM (3300 is usual for our engine, 3400 is the max rating). The max speed was about 3.5 knots after a friend, who is a mechanic, bled the injectors and told us to get a new air filter.

He also told us to get a new fuel filter (and a "better" one than we have..racor R12P is the name on the filter).

The "charge" light goes on when the engine is on, complete with it's associated buzzer noise. However, the light extinguishes if the RPM goes up. We can get the alarm to turn off if we change the switch to "illumination" from the default "on" position.

Finally: the propeller shaft now has a distinct vibration to it and the negine seems to bounce around more than it did when we bought the boat 2 years ago. The engine mounts look ok to my amateur eyes. However, we do have powdery rubber-smelling material in the bilge.

The questions:
1. Bad alternator?
2. New filters etc would be helpful?
3. New engine mounts needed?
4. Anything else that we might be missing before I can a mechanic?
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