Hi All, Here is an interesting anomaly. Sometimes, not always, in fact very infrequently my engine will sound as though it is losing power. It is very odd. The situation is this. Ill be crusing at around 2800 RPM for a period longer than 10 minutes. After a while, I will hear the engine cycle down (as if I were to pull the throttle back quickly). This gets corrected by my pulling the throttle down, and then advancing it slowly back to 2800 RPM. Problem doesn't come back for weeks and then it happens again (usually when I have company on board ;-). Anyone know what this is? I figure it might be something with the guide wire connecting the engine with the throttle. Too much slack? Gerry
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Bryan C.
Sounds like a fuel problem.
If the engine is otherwise running well (i.e. no excess smoke) what you are describing sounds like the fuel supply is being limited. Check your filters (are they clean) and the intake lines and screen in the tank to make sure flow isn't being restricted.
If the engine is otherwise running well (i.e. no excess smoke) what you are describing sounds like the fuel supply is being limited. Check your filters (are they clean) and the intake lines and screen in the tank to make sure flow isn't being restricted.
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John Kudera
I agree with Brian
A few weeks ago we were cruising south on the Atlantic when our engine did the same trick,several times. We did complete our trip to Trump Marina, and after the engine cooled, and we helped ourselves to some Trump cash, I changed the filters, and made the trip back to Barneget Bay. The engine ran perfectly for the entire trip, about three miles from home we had the same thing happen again. Long story shortened, we found a small bit of hose type material lodged in the fuel pick up tube in the fuel tank. We pumped the fuel out, cleaned the tank, and re filled with fresh clean fuel, no problem since. wish you luck.
A few weeks ago we were cruising south on the Atlantic when our engine did the same trick,several times. We did complete our trip to Trump Marina, and after the engine cooled, and we helped ourselves to some Trump cash, I changed the filters, and made the trip back to Barneget Bay. The engine ran perfectly for the entire trip, about three miles from home we had the same thing happen again. Long story shortened, we found a small bit of hose type material lodged in the fuel pick up tube in the fuel tank. We pumped the fuel out, cleaned the tank, and re filled with fresh clean fuel, no problem since. wish you luck.
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Eric Lorgus
Sounds like throttle to me
Gerry: You say your engine appears to throttle itself back, & all you do to correct it is merely throttle back and then slowly advance again until reach 2800 RPM. This sounds like throttle creep. Usually there's some mechanism to create throttle friction, to help it hold the position you set. If this begins to slip, your engine will throttle itself back. On my boat (87H285), the friction mechanism is inside the binnacle. Have you tried advancing the throttle without retarding it first when this happens? If this is a throttle linkage issue, the engine should respond.
Gerry: You say your engine appears to throttle itself back, & all you do to correct it is merely throttle back and then slowly advance again until reach 2800 RPM. This sounds like throttle creep. Usually there's some mechanism to create throttle friction, to help it hold the position you set. If this begins to slip, your engine will throttle itself back. On my boat (87H285), the friction mechanism is inside the binnacle. Have you tried advancing the throttle without retarding it first when this happens? If this is a throttle linkage issue, the engine should respond.
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Tom LaRocco
Or maybe..
Gerry; Last season on my 98 37.6 I had a similiar problem, after changing both filters and much fuel bleeding I still had the problem. It turned out to be a partially plugged screen located at the bottom of the fuel pick up tube in the tank. We pulled the tube, cleaned the screen, filtered the remaining fuel in the tank, and started using a fuel additive to reduceeliminate bad stuff from growing in the diesel fuel. So far all has been well. Good Luck Tom LaRocco "Follow the Sun"
Gerry; Last season on my 98 37.6 I had a similiar problem, after changing both filters and much fuel bleeding I still had the problem. It turned out to be a partially plugged screen located at the bottom of the fuel pick up tube in the tank. We pulled the tube, cleaned the screen, filtered the remaining fuel in the tank, and started using a fuel additive to reduceeliminate bad stuff from growing in the diesel fuel. So far all has been well. Good Luck Tom LaRocco "Follow the Sun"
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Chuck Wolfe
Same Problem
I echo everyone response about the problem being fuel related. I had the identical situation. I had my tank pumped and washed and the operator told me that treating the fuel helps, but the crap still ends up on the bottom of the tank and most of the big boats he has seen eventually just have their tanks washed and cleaned every two to three years. Mine was so bad, for so long, that the fuel pump actually croaked, something which normally doesn't happen on Yanmar's. It was just working too hard. One symptom I noted was that when I started the engine I had to run it for a few seconds at 1500 or so RPM's or it would stall out. Once I cleaned and pumped the tank, it stopped doing it. ChuckWolfe@mail.com
I echo everyone response about the problem being fuel related. I had the identical situation. I had my tank pumped and washed and the operator told me that treating the fuel helps, but the crap still ends up on the bottom of the tank and most of the big boats he has seen eventually just have their tanks washed and cleaned every two to three years. Mine was so bad, for so long, that the fuel pump actually croaked, something which normally doesn't happen on Yanmar's. It was just working too hard. One symptom I noted was that when I started the engine I had to run it for a few seconds at 1500 or so RPM's or it would stall out. Once I cleaned and pumped the tank, it stopped doing it. ChuckWolfe@mail.com
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Rod Leonard
Fuel
I had the same problem changed the filters no help. Pulled fuel pick up tubes, found wire screen filter in pick up tube at 90 elbow. Plugged off tight.
I had the same problem changed the filters no help. Pulled fuel pick up tubes, found wire screen filter in pick up tube at 90 elbow. Plugged off tight.
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Gerry Libertelli
Thanks!!
Hi Folks, Thanks everyone for the input! Ive got my job list for this weekend. 1. Change Filter 2. Check Sea Strainer and fittings 3. Empty and clean out fuel tank (checking for screens and other fittings that might be loose. 4. Bleed Engine 5. Refill and test out. It should be said that recently Ive experienced some "tense moments" starting the engine. This is usually corrected by pulling out the choke. Attempting a start. Letting in the choke at this point starts the engine. It should be said that this has been extremely infrequent, and is really only magnified by the timing of one or two situations. Hopefully these are all related, and the good advice I've gotten will correct the situation. Wish me luck!!! Gerry
Hi Folks, Thanks everyone for the input! Ive got my job list for this weekend. 1. Change Filter 2. Check Sea Strainer and fittings 3. Empty and clean out fuel tank (checking for screens and other fittings that might be loose. 4. Bleed Engine 5. Refill and test out. It should be said that recently Ive experienced some "tense moments" starting the engine. This is usually corrected by pulling out the choke. Attempting a start. Letting in the choke at this point starts the engine. It should be said that this has been extremely infrequent, and is really only magnified by the timing of one or two situations. Hopefully these are all related, and the good advice I've gotten will correct the situation. Wish me luck!!! Gerry
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Stevec
Did you say 'choke'
on your last response???? Didn't know your engine had a choke on it. Are you sure??
on your last response???? Didn't know your engine had a choke on it. Are you sure??
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