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I. I bought a 31' sailboat with a Yanmar 3GM30F, around 20
I bought a 31' sailboat with a Yanmar 3GM30F, around 20 years old, 800 hours on it (if the counter has not been replaced). It starts well, idles well and in neutral it can easily reach the max rpm of around 3500. And when on the swing mooring I can run it (in reverse) to around 3200 rpm. When moving the boat under load however I seem to lose power - up to around 1600-1700rpm the boat moves (but quite slow) and if I push the engine to full throttle, it just hits around 1800rpm and starts emitting lots of black smoke and soot. Injectors have been removed and cleaned (fair amount of carbon build up). Fuel is older but has conditioner added and no water in it. All fuel lines and filters have been replaced. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I am running Twin Iveco 8061 SRM 30.10 Diesel engines the
Hi I am running Twin Iveco 8061 SRM 30.10 Diesel engines the Starboard engine keeps puffing out a lite black smoke when crusing at 17 knots and gets worse as you slow down I had the injectors checked … read more
briggs archer
briggs archer
master marine mechanic
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I had my 64HP yanmar (on a sailboat) tuned up (all filters
I had my 64HP yanmar (on a sailboat) tuned up (all filters and fluids replaced) approximately 2 years ago. Minimal running hours for approximately 3 months then have not started it in approximately 1.… read more
Jason
Jason
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Vocational, Technical or Trade School
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I have a 65hp diesel auxiliary for my sailboat. It is a
I have a 65hp diesel auxiliary for my sailboat. It is a Yamnar. It runs fine, for a say 5 minutes, then gets rough, RPMs drop and then she stalls. I can then start it back up in a minute (easier by gi… read more
Jason
Jason
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Vocational, Technical or Trade School
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Jason I have twin AD41B's, the starboard engine falters
Hi Jason I have twin AD41B's, the starboard engine falters at 2000 rpm, throws out a lot of soot untill I get on the plane with the stronger port engine. recon pump and new after cooler fitted. temp a… read more
Jason
Jason
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Vocational, Technical or Trade School
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Problem with a yannmar 2qm15. Starts and runs OK at medium
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Jason
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i have a 9 horsepower inboard diesel on my sailboat, and when
i have a 9 horsepower inboard diesel on my sailboat, and when I increase the power by pushing the lever forward, i get very little increase in rpm, doesn't get any higher that about 28, and the boat s… read more
Jason
Jason
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I have a perkins diesel in my sailboat. It has a fresh water
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I have a Yanmar 4JH3/HTE in my Uniflight Salty Pup. I just
I have a Yanmar 4JH3/HTE in my Uniflight Salty Pup. I just bought this boat and ran it today for the first time. The engine started right up and seemed to run well. After she was warmed up, I tried to… read more
Jason
Jason
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Im hoping you might have an idea why the cooling sea water
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Michael
Michael
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I have a 12 HP Ynamar Diesel in my C&C 27 sailboat. Because
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Jason
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Thanks in advance for reading the post... I have a Yanmar
Thanks in advance for reading the post... I have a Yanmar 3GM30F on our 36 foot sailboat. I was out of the country (active duty military) for 8 months. During that time I had a friends come down and s… read more
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I have a 466 w/ 480 volvos, after running 4 to 8 hrs soot builds
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I need help to repair my Yanmar diesel engine. I live on West
I need help to repair my Yanmar diesel engine. I live on West Point lake in Lagrange, GA and have a yanmar diesel on my Odey 28 foot sailboat. Last fall, I was motoring out to sail and the engine was … read more
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Have friends heading north on the Intercoastal Waterway (Savannah
Have friends heading north on the Intercoastal Waterway (Savannah to Baltimore) aboard a sailboat with a Yanmar diesel (500hrs)... Boat sat for 3 years. Diesel fuel in bowl and filter is black. Engine… read more
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