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    • Cummins Marine Forum Topics
    • Low RPM & Black Smoke 1 2 3

      This topic has 52 replies, has 7 voices, and was last updated byfirehoser75 5 years ago

      September 30, 2018 at 7:11 pm I have Cummins 6BTA5.9M3 330 HP@2800 RPM engines installed on our 2002 Bayliner 4788. The engines have logged approximately 1470 hours. I routinely operate the engines around 1500 RPM and cruise at about 8.5 knots. A couple of months ago, I was requested to pickup my speed to make a bridge opening and discovered the port engine would not accelerate to its rated RPM. In fact, the boat following me reported black smoke billowing out our exhaus…

      Started by: NoSpeed in: Cummins Marine Engines

      52 Replies
      January 11, 2019 at 3:57 pm NoSpeed, Your boat and your call, but if it was me, I would not want to risk further damage to the engines or even the new components you are just installing to gain a month or so of boating time. Bayliner is a popular make, so I would guess that any place that does a lot of exhausts has probably already done these before, which may shorten the timeframe. JMHO Good luck with whatever you finally decide, Tom

      Last Post by: firehoser75 posted: 5 years ago

    • Heat Exchanger Zinc Length Issue

      This topic has 1 reply, has 2 voices, and was last updated byNoSpeed 7 years ago

      October 19, 2016 at 9:43 pm The later style Champ heat exchanger (offset inlet/outlet) appears to have a zinc length issue which is confirmed by some and negated by others. Ā Strange that the feedback differs but I can only speak to my findings. Ā My heat exchanger zinc DOES bottom out against the end casting. Ā I did not realize it on my first zinc change. Ā I do not go tight-tight on the zincs so no damage was done and it clearly had enough threads engaged to make a watertig…

      Started by: Rob Schepis in: Cummins Marine Engines

      1 Reply
      November 12, 2016 at 8:23 pm Rob, I was changing out all my zincs today.Ā  All, except one, had more than 50% life.Ā  But, I changed them anyway, thinking they would not go another season.Ā  The one exception was on the oil cooler.Ā  All that came out was the cap.Ā  Do you know if the remnants of that zinc would cause me any issue?Ā  Water temps are normal.Ā  Thanks.

      Last Post by: NoSpeed posted: 7 years ago

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Viewing 2 topics - 1 through 2 (of 2 total)