Sudden very ragged running problem

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  • BlueChip
    Frequent Contributor
    • Aug 2015
    • 8

    #16
    Similar problem w/ Vid and story.

    Hello all!

    I'm new to the community as I just acquired a 1975 C&C 30 from my step father.

    The boat was not maintained for 5+ years until my twin and I decided to take it off his hand this season. Its been 4 months worth of weekend work on BlueChip with, steady, visible progress - Except for the engine.

    The engine has been a problem child on this project. here is a short story that leads to my post today.

    4 months ago my brother and I came down from NY to Solomans Island, MD. to take a look at BlueChip. We fell in love and wanted to take on the project of restoring her. She wasn't in bad shape, but she was neglected for 5+ Years.

    We started with the engine, as we didn't know how much money the engine will need to start and make reliable again. after a survey of the engine and 2 weekends worth of work; Fuel tank empty/clean , fuel system check, Carb cleaning, Oil and other regular tune up tasks.

    It ran! we were surprised. Even the marina mechanic was somewhat surprised.

    Fast forward 2 weeks. We come back down from NY and the engine wouldn't start. It would turn over, starter motor worked and it was getting fuel. after a quick weekend of tinkering... Nothing! it just wouldn't start. (No real work was done on the engine)

    2 Weeks ago we come down from NY again, with the only task on our list being the engine - During the long period between we had the boat hauled, bottom cleaned and painted, full rig inspection, replacement of all running rigging.

    Work started at 6AM that Friday. the fuel was again syphoned out and we put in new gasoline (Checked the tank and it was still clean). checked the fuel lines and carb with nothing notable to show for it. I decided to clean the Carb one more time, and the engine started.

    We left the engine on for 20 - 30 mins and it ran smoothly on low to mid RPM. No coughing or anything. as the engine ran my brother and I were checking all water lines, gas lines, exhaust, etc to make all was in order.

    We found that the water pump was leaking profusely and the exhaust system was pretty much made of dust. THAT didn't phase us, as the engine was now running and running smoothly.

    Fast forward to Labor Day weekend. It was a busy couple of weeks in NY but we managed to rebuild a new exhaust (W/ MMI purchased Flange, brass fittings, wrap, heat paint, etc.) and we purchased a new MMI water pump (It looks so nice and clean... love it.) The time had finally come... we left a smoothly running engine with minor problems and now we are back with the solutions.

    We started work at 6AM on the Friday before Labor Day. It was a great day. Pump went on with no problems (other than a thru hull valve that snapped clean in half BUT it was replaced.) The exhaust was also installed with no problems to mention, other than it was a tight fit.

    We held our breath and started the engine. Just like two weeks back, it started immidiialtey and ran smoothly. We decided to do a 'reliability' test. The test lasted an hr and 20 mins. During this test we did the following.

    - Adjusted the idle speed. (No Tachometer)
    - Made sure that with forward/ reverse were engaged, the engine didn't stall. (it stalled once due to a low idle speed)
    - Ran in forward, on the dock, for 30 mins and reverse for 30 mins.
    - No leaks to speak of
    - No exhaust or gas smell.

    It would be good to mention that in the first 20 mins the engine was started and stopped 5-7 times. All the restarts were immediate and smooth. the following hr was used to run the engine under load and to check the transmission forward and reverse gears. All checked out other than a drip leak at the stuffing box (This will get fixed soon.)

    Sept 6th was the day we walked up to our boat and said " Lets take her out on motor and enjoy our boat on the water and away from the dock for the first time."

    We get to BlueChip at 7AM on sept 6th full of hope and excitement.

    Started the engine as we prepared an anchor (just incase) and prepared the jib and main just incase things went so smooth we decide to actually sail.

    Engine ran for about 20 mins then sputtered ever so smoothly and slowly to a stop. We didn't think much of it until we tried to start it again. The engine wouldn't start, It would run for 2-5 seconds then sputter slowly to a stop. The engine would also start, run for 10 secs but didn't seem to respond to the throttle lever at all (both from helm and the carb.) We tried to run it 5 times with the same thing happening. There were no loud sounds or abrupt engine stopping.

    The day ended with the engine NOT running.

    Labor Day. Yet again all the projects on the boat come to a halt due to the engine.

    after a few tests, there was no luck with the engine. So i took this Video to show you what i mean with "the engine sputters slowly to a stop" when we try to run it. Apologies on the long video but it shows the times we tried to start the engine and the sputtering of the engine.

    at the end of this video, as my brother says " are you sure its getting gas... Does that sound like its getting gas to you?" I thought of looking at the gas lines again. I tracked it yet again from the tank. all checked out until I reached the carb.

    The fuel pump was pushing fuel into the carb (Tested this by disconnecting the inlet and trying to start the engine.) Then removed the gas line entering to the engine from the carb and ran the engine again. This time there was no gas at the inlet of the engine. So I went one step further by checking the outlet of the carb (on the bottom). ran the engine again, there was no gas coming out of the carb.

    The few questions i have are.

    - How can it run for over an hr the day before and just not want to start again?
    - The Carb was cleaned just this morning. Can it be the jets?
    - Carb is spanking clean (although it can probably use a rebuild.) Should i rebuild or buy a new one ( keep in mind that the cost of a new one is not stopping me from buying one.)
    - What other problems could i be facing other than the carb at this point?
    - Does anyone else hear anything unusual in the video as the engine is trying to start?

    I apologize for the long post. Just want to make sure you guys have a clear idea of what has been going on. I've read many posts and it seems like the community is really knowledgable and helpful.

    I will be back in Solomans next week to work on the engine. Any input/test/parts that you would suggest can/ will happen then.

    Thank you all again for your time.

    B.

    Comment

    • Marian Claire
      Afourian MVP
      • Aug 2007
      • 1768

      #17
      Golfdad75.
      So what was the problem?
      Overwhelmed filter.
      Crud in the carb.
      Water/crud at the bottom of the tank.
      Out of gas.

      What did the liquid in the filter look like?
      Did you see any blockages in the carb?
      What did the bottom gallon look like?
      What was the fuel level?

      Dan S/V Marian Claire

      Comment

      • Marian Claire
        Afourian MVP
        • Aug 2007
        • 1768

        #18
        Bluechip. Welcome to the forum.
        "Then removed the gas line entering to the engine from the carb and ran the engine again. This time there was no gas at the inlet of the engine."
        This has me confused. Are you talking about the scavenge tube?
        What type of fuel pump do you have?
        " Fuel tank empty/clean" How was the tank cleaned?
        Dan S/V Marian Claire
        Last edited by Marian Claire; 09-08-2015, 08:16 AM. Reason: More ?s

        Comment

        • Mo
          Afourian MVP
          • Jun 2007
          • 4468

          #19
          Originally posted by BlueChip View Post
          Hello all!

          I'm new to the community as I just acquired a 1975 C&C 30 from my step father.

          The boat was not maintained for 5+ years until my twin and I decided to take it off his hand this season. Its been 4 months worth of weekend work on BlueChip with, steady, visible progress - Except for the engine.

          The engine has been a problem child on this project. here is a short story that leads to my post today.

          4 months ago my brother and I came down from NY to Solomans Island, MD. to take a look at BlueChip. We fell in love and wanted to take on the project of restoring her. She wasn't in bad shape, but she was neglected for 5+ Years.

          We started with the engine, as we didn't know how much money the engine will need to start and make reliable again. after a survey of the engine and 2 weekends worth of work; Fuel tank empty/clean , fuel system check, Carb cleaning, Oil and other regular tune up tasks.

          It ran! we were surprised. Even the marina mechanic was somewhat surprised.

          Fast forward 2 weeks. We come back down from NY and the engine wouldn't start. It would turn over, starter motor worked and it was getting fuel. after a quick weekend of tinkering... Nothing! it just wouldn't start. (No real work was done on the engine)

          2 Weeks ago we come down from NY again, with the only task on our list being the engine - During the long period between we had the boat hauled, bottom cleaned and painted, full rig inspection, replacement of all running rigging.

          Work started at 6AM that Friday. the fuel was again syphoned out and we put in new gasoline (Checked the tank and it was still clean). checked the fuel lines and carb with nothing notable to show for it. I decided to clean the Carb one more time, and the engine started.

          We left the engine on for 20 - 30 mins and it ran smoothly on low to mid RPM. No coughing or anything. as the engine ran my brother and I were checking all water lines, gas lines, exhaust, etc to make all was in order.

          We found that the water pump was leaking profusely and the exhaust system was pretty much made of dust. THAT didn't phase us, as the engine was now running and running smoothly.

          Fast forward to Labor Day weekend. It was a busy couple of weeks in NY but we managed to rebuild a new exhaust (W/ MMI purchased Flange, brass fittings, wrap, heat paint, etc.) and we purchased a new MMI water pump (It looks so nice and clean... love it.) The time had finally come... we left a smoothly running engine with minor problems and now we are back with the solutions.

          We started work at 6AM on the Friday before Labor Day. It was a great day. Pump went on with no problems (other than a thru hull valve that snapped clean in half BUT it was replaced.) The exhaust was also installed with no problems to mention, other than it was a tight fit.

          We held our breath and started the engine. Just like two weeks back, it started immidiialtey and ran smoothly. We decided to do a 'reliability' test. The test lasted an hr and 20 mins. During this test we did the following.

          - Adjusted the idle speed. (No Tachometer)
          - Made sure that with forward/ reverse were engaged, the engine didn't stall. (it stalled once due to a low idle speed)
          - Ran in forward, on the dock, for 30 mins and reverse for 30 mins.
          - No leaks to speak of
          - No exhaust or gas smell.

          It would be good to mention that in the first 20 mins the engine was started and stopped 5-7 times. All the restarts were immediate and smooth. the following hr was used to run the engine under load and to check the transmission forward and reverse gears. All checked out other than a drip leak at the stuffing box (This will get fixed soon.)

          Sept 6th was the day we walked up to our boat and said " Lets take her out on motor and enjoy our boat on the water and away from the dock for the first time."

          We get to BlueChip at 7AM on sept 6th full of hope and excitement.

          Started the engine as we prepared an anchor (just incase) and prepared the jib and main just incase things went so smooth we decide to actually sail.

          Engine ran for about 20 mins then sputtered ever so smoothly and slowly to a stop. We didn't think much of it until we tried to start it again. The engine wouldn't start, It would run for 2-5 seconds then sputter slowly to a stop. The engine would also start, run for 10 secs but didn't seem to respond to the throttle lever at all (both from helm and the carb.) We tried to run it 5 times with the same thing happening. There were no loud sounds or abrupt engine stopping.

          The day ended with the engine NOT running.

          Labor Day. Yet again all the projects on the boat come to a halt due to the engine.

          after a few tests, there was no luck with the engine. So i took this Video to show you what i mean with "the engine sputters slowly to a stop" when we try to run it. Apologies on the long video but it shows the times we tried to start the engine and the sputtering of the engine.

          at the end of this video, as my brother says " are you sure its getting gas... Does that sound like its getting gas to you?" I thought of looking at the gas lines again. I tracked it yet again from the tank. all checked out until I reached the carb.

          The fuel pump was pushing fuel into the carb (Tested this by disconnecting the inlet and trying to start the engine.) Then removed the gas line entering to the engine from the carb and ran the engine again. This time there was no gas at the inlet of the engine. So I went one step further by checking the outlet of the carb (on the bottom). ran the engine again, there was no gas coming out of the carb.

          The few questions i have are.

          - How can it run for over an hr the day before and just not want to start again?
          - The Carb was cleaned just this morning. Can it be the jets?
          - Carb is spanking clean (although it can probably use a rebuild.) Should i rebuild or buy a new one ( keep in mind that the cost of a new one is not stopping me from buying one.)
          - What other problems could i be facing other than the carb at this point?
          - Does anyone else hear anything unusual in the video as the engine is trying to start?

          I apologize for the long post. Just want to make sure you guys have a clear idea of what has been going on. I've read many posts and it seems like the community is really knowledgable and helpful.

          I will be back in Solomans next week to work on the engine. Any input/test/parts that you would suggest can/ will happen then.

          Thank you all again for your time.

          B.
          Sure sounds like she's starving for fuel...and likely due to a blockage, bad fuel or a combination of both.

          The boat is new to you and sounds like it's been not as actively used as it could have been...so here's what I'd do:
          -pump all fuel from the tank. Use hose and try to rock the boat doing so...it will mix up water to be extracted and dirt as well. Hopefully you will get it pretty clean....I know you did this already....your call on doing it again.
          -next change all filters.
          -install a polishing filter as well near the carb...an auto in-line filter is fine.
          -take the carb off and clean it up again.
          -all rubber lines need to be ethanol resistant.
          -check all gaskets and seals on filters and carb when it starts...you have played with your fuel supply so ensure not air leaks or frank gas leaks from tank to carb.
          NOTE:Since you are new to the A4 I'll put this in. Do not under estimate the explosive power of gas fumes in your boat. Once you open the system ensure there are no ignition sources...power and key off. Keep the boat well ventilated. Once done and ready to start, walk away from the boat and go for beer...come back and if there's a strong smell of gas refrain from starting. Sun on a boat creates ideal dangerous conditions so please be carefull.

          Just curious did the shut happen after you got into a few waves and the boat was moving???...if so it could be dirt from the tank or old lines.
          Last edited by Mo; 09-08-2015, 10:43 AM.
          Mo

          "Odyssey"
          1976 C&C 30 MKI

          The pessimist complains about the wind.
          The optimist expects it to change.
          The realist adjusts the sails.
          ...Sir William Arthur Ward.

          Comment

          • JOHN COOKSON
            Afourian MVP, Professor Emeritus
            • Nov 2008
            • 3500

            #20
            Divide And Conquer

            BC
            As you have noticed in the comments so far there can be many causes of fuel starvation.
            Here's how to speed up the diagnosis a bit. Get the carb as clean as possible and the fuel pump working as well as possible then attach an auxiliary tank with clean fuel to the fuel pump and see what happens. This will tell you if the problem is before or after the fuel pump.
            Word of warning: Serial cleaning of the carb will not solve the problem.

            TRUE GRIT

            Comment

            • Bratina
              Senior Member
              • Jun 2015
              • 96

              #21
              Originally posted by JOHN COOKSON View Post
              BC
              As you have noticed in the comments so far there can be many causes of fuel starvation.
              Here's how to speed up the diagnosis a bit. Get the carb as clean as possible and the fuel pump working as well as possible then attach an auxiliary tank with clean fuel to the fuel pump and see what happens. This will tell you if the problem is before or after the fuel pump.
              Word of warning: Serial cleaning of the carb will not solve the problem.

              TRUE GRIT
              I'll second this; I spent countless hours with my fuel system - including a full carb rebuild and six or seven 'serial cleanings', until I stopped guessing, ran beautifully from an auxiliary tank, and found out I had water in my gas, which was overwhelming the separator...

              Comment

              • Golfdad75
                Senior Member
                • Sep 2014
                • 115

                #22
                I don't know

                Engine ran great Sunday and Monday. I check the bottom 2 gallons of gas by pouring it into a mason jar. Saw no water. Emptied the racor into a jar, saw no water. So I guess I had gotten some trash in the carburetor. Cleaning the carburetor did the trick. Put in 5 gallons of marine fuel and added 2 oz of MMO. I highly recommend the Moyer Marine video on carb. I am running a little rich right now but it purrs.
                One thing I have come to the conclusion is Atomic Fours are not for the people who don't want to work on them. However I find it highly rewarding to fix my own problems with the help of this forum and Ken at Moyer Marine.

                Comment

                • Marian Claire
                  Afourian MVP
                  • Aug 2007
                  • 1768

                  #23
                  Golfdad75. Thanks for the additional info. Sounds like a logical process based on your finding.
                  Dan S/V Marian Claire

                  Comment

                  • Dave Neptune
                    Afourian MVP, Professor Emeritus
                    • Jan 2007
                    • 5044

                    #24
                    Sounds possibly like a sticky float to me. Pressure at the carb and a dry bowl is pretty much the only thing to cause that.

                    Dave Neptune

                    Comment

                    • hanleyclifford
                      Afourian MVP
                      • Mar 2010
                      • 6990

                      #25
                      Originally posted by Dave Neptune View Post
                      Sounds possibly like a sticky float to me. Pressure at the carb and a dry bowl is pretty much the only thing to cause that.

                      Dave Neptune
                      Hmmm...could the little rubbery thingy on the end of the needle be getting itself intermittently stuck in the seat?

                      Comment

                      • hanleyclifford
                        Afourian MVP
                        • Mar 2010
                        • 6990

                        #26
                        Originally posted by Bratina View Post
                        I'll second this; I spent countless hours with my fuel system - including a full carb rebuild and six or seven 'serial cleanings', until I stopped guessing, ran beautifully from an auxiliary tank, and found out I had water in my gas, which was overwhelming the separator...
                        This comes under the classification of doing the same thing again and again and expecting a different result.

                        Comment

                        • Bratina
                          Senior Member
                          • Jun 2015
                          • 96

                          #27
                          Originally posted by hanleyclifford View Post
                          This comes under the classification of doing the same thing again and again and expecting a different result.
                          Insanity: doing the same thing over and over again and expecting different results. Albert Einstein

                          Couldn't agree more

                          Comment

                          • hanleyclifford
                            Afourian MVP
                            • Mar 2010
                            • 6990

                            #28
                            Originally posted by Bratina View Post
                            Insanity: doing the same thing over and over again and expecting different results. Albert Einstein

                            Couldn't agree more
                            Yes; "serial cleanings" reflect neither inductive nor deductive logic. Serial "problems", however can often be solved by induction whereas "esoteric" problems require deduction. The difference is often a matter of experience.

                            Comment

                            • hanleyclifford
                              Afourian MVP
                              • Mar 2010
                              • 6990

                              #29
                              We have learned that an engine that will run at high rpm (albeit roughly) but not near idle often has the two idle ports plugged. However, inasmuch as the running at high rpms is rough, that should lead us back to suspicion of the main jet or needle/seat.
                              Last edited by hanleyclifford; 09-08-2015, 07:49 PM.

                              Comment

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