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    • Cummins Marine Forum Topics
    • Low RPM Cruise

      This topic has 5 replies, has 3 voices, and was last updated byDon Gardner 1 year ago

      August 16, 2022 at 3:55 pm I have a 1999 Maxum 4100 SCR with twin 6BTA 330’s. Until the fuel prices skyrocketed I always cruised at 2400 not 2600 RPM’s. Now I am cruising at 1500 to 1600 RPM’s. Do I need to run it up to 2400 to 2600 every 8 hours to keep the engines from having issues?

      Started by: Don Gardner in: Cummins Marine Engines

      5 Replies
      August 19, 2022 at 8:43 am Thanks for the input Rob. My boat has a planning hull and last winter I added two more trim tabs at the keel line. I can now run bow down at any speed rather than having to stand to see over the bow. Much more efficient and I no longer have to get over the hump. That said, after reading Tonys article on low speed running and your and Steves input I plan to take it to hit cruise RPMs at the end of each hull speed run.  

      Last Post by: Don Gardner posted: 1 year ago

    • Fuel line restriction?

      This topic has 9 replies, has 2 voices, and was last updated byRob Schepis 4 years ago

      October 22, 2019 at 5:16 pm I have had an intermittent issue with my starboard 6bta 330 engine. When the bottom of the boat is clean (right after a haul out) it reaches full rpm (2950-3000). After a month or so it won’t reach more than 2500. Feels like it is starving for fuel and not able to push the extra load of growth on the bottom. No issue with the port engine. I have vacuum gauges on the primary fuel filters. The port gauge stays around 2 in/hg. The starboard r…

      Started by: Don Gardner in: Cummins Marine Engines

      9 Replies
      November 6, 2019 at 5:57 pm To test it, at the dock with the starboard engine running, close the fuel valve between the primary filter and the tank and watch the gauge it should start to rise, open it before the engine sputters out.

      Last Post by: Rob Schepis posted: 4 years ago

    • 6bta hard starting 1 2

      This topic has 36 replies, has 5 voices, and was last updated byDon Gardner 4 years ago

      August 6, 2019 at 5:31 pm My port engine has always taken longer to start than the starboard engine. It cranks fine but it usually takes two tries for it to start. I have taken the fuel shutoff solenoid apart and cleaned it as well as cut the ground wire from the harness and grounded it to the solenoid mounting bolt. Also I cleaned the connections on the mag switch/soienoid. Not sure where to go from here. anyone have any suggestions?

      Started by: Don Gardner in: Cummins Marine Engines

      36 Replies
      September 26, 2019 at 8:09 am The valve adjustment appears to have helped. Some valves were too tight and others too loose. I want to thank Tony and Rob for sticking with me and solving the problem. As always, great advice. I read through the forum often and always find some relevant information that I can use to make my life easier and keep my boat in good order. Don

      Last Post by: Don Gardner posted: 4 years ago

    • 6bta overheat?

      This topic has 13 replies, has 6 voices, and was last updated byDon Gardner 4 years ago

      May 21, 2019 at 8:50 am I am new to diesel marine engines but I know they are different than the truck engines I am accustomed to. I have a Maxum 4100 SCR with twin Cummins 6bta 5.9 M3 330’s. I have recently had the after coolers and heat exchangers serviced at a local radiator shop that specializes in marine coolers. Also have a new sea water pump on the starboard engine and new impeller on the port engine. Both engines will reach 2950+ rpms and I normally cruis…

      Started by: Don Gardner in: Cummins Marine Engines

      13 Replies
      June 10, 2019 at 10:10 am Beautiful spot. As are all of the San Juan Islands and the Canadian Gulf Islands.

      Last Post by: Don Gardner posted: 4 years ago

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