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    • Cummins Marine Forum Topics
    • Mystery Plastic Chips 6BTA

      This topic has 4 replies, has 4 voices, and was last updated byTony Athens 6 months ago

      October 15, 2023 at 8:05 am See the picture below.Ā  Found the larger plastic chips on the floor, in the front of my 6BTA 5.9 M1 a couple of years ago.Ā  Recently a bunch more smaller pieces showed up.Ā  They’re hard, black plastic, about 1/8″ thick.Ā  Can’t see anything on the front of engine.Ā  Are they possibly some dust/debris cover on the back of the belt tensioner or idler pulley?Ā  Engine powers my 2006 Nordic Tug 32, 2700+ hours.

      Started by: John in: Cummins Marine Engines

      4 Replies
      October 23, 2023 at 6:33 am Single engine boat–18 yrs old & 2700 hours.. Nothing to inspect———————–Replace it and the idler,Ā  and along a new genuine belt

      Last Post by: Tony Athens posted: 6 months ago

    • Quick Question on HX End Caps and Gaskets

      This topic has 2 replies, has 3 voices, and was last updated byRob Schepis 5 years ago

      April 22, 2019 at 6:49 am Getting ready to replace a leaking end cap and gasket on 6BTA heat exchanger. I’m using the Seaboard caps and gaskets. My question is whether any material or not should be applied to edge of HX tube, gaskets, or cap. After an exhausting search on this site, came up with several responses. 1. Nothing, Seaboard gasket is soft enough. 2. A little bit of grease on gasket edges. 3. Rectoseal on gasket edges. 4. Light coat of RTV …

      Started by: John in: Cummins Marine Engines

      2 Replies
      April 22, 2019 at 8:21 am A little Rector Seal 5 is always good.

      Last Post by: Rob Schepis posted: 5 years ago

    • JWAC air heaters

      This topic has 6 replies, has 5 voices, and was last updated byJohn 5 years ago

      November 13, 2018 at 8:51 am After a couple of days of real cold weather this past October in Rhode Island, with ice on the deck of the boat, tried to start engine (270 HP 6BTA JWAC CPL 2956) and noticed the voltage cycling for the grid heaters wasnā€™t happening. Engine very hard to start, and when it finally did, a lot of white smoke poured out of exhaust. Engine finally settled down and warmed up. OK. Something going on with the grid heater. Check grid solenoid and ECM…

      Started by: John in: Cummins Marine Engines

      6 Replies
      November 15, 2018 at 8:50 am Corey, I assume Tony’s “this may help” was a reference to Tony’s Tips. I was able to find a couple of articles on air heaters. More than likely he’s referencing the “5-minute Twist Timer or Momentary Switch” schematic and the picture of a contactor mounted to the JWAC. For now, I’m going to remove all the components and wiring from the ECM and contactors. I’ll mount a switch on my console t…

      Last Post by: John posted: 5 years ago

    • 6BTA Heat Exchanger End Cap

      This topic has 1 reply, has 2 voices, and was last updated byStephen Oliver 5 years ago

      October 21, 2018 at 7:50 am Getting ready to replace a slightly leaking end cap on HX. New cap and gasket purchased from Seaboard. After cleaning edge of HX tube, and a light sanding with 1000 grit wet/dry, should I spread a VERY THIN coat of some gasket sealer on the edge of the tube before installing gasket and cap? Some non-permanent sealer from Permatex or Loctite?

      Started by: John in: Cummins Marine Engines

      1 Reply
      October 21, 2018 at 8:06 am I was a bit more brutal and cleaned the end caps and the HX ends up with a wire wheel on a drill.. didnt seem to harm them, made sure they were cleaned and then assembled using SBMar gaskets which are really soft so seal all the imperfections well. No leaks and no sealant used. Steve

      Last Post by: Stephen Oliver posted: 5 years ago

    • 6BTA heat exchanger SWEATING ?

      This topic has 5 replies, has 3 voices, and was last updated byBob Neill 5 years ago

      June 1, 2018 at 1:55 pm 6BTA 5.9 270 HP, JWAC in a boat I bought new in 2006. Home port is Rhode Island. Boat hauled and winterized for 5 months, in the water for 7 months. This is my 13th season, and engine has about 2,000 hours on it. My issue is with the heat exchanger. Over the years, Iā€™ve noticed a little trace of water coming down the rear, bottom hose of the HE. Tightened hose clamp over the years, but essentially ignored it. What little water rolled down…

      Started by: John in: Cummins Marine Engines

      5 Replies
      June 4, 2018 at 6:25 pm Glad to hear you resolved your issue, even if it is temporary. Keep us posted if anything changes.

      Last Post by: Bob Neill posted: 5 years ago

    • 6BTA Source of Antifreeze Leak?

      This topic has 8 replies, has 6 voices, and was last updated byJohn 6 years ago

      January 29, 2018 at 9:58 am Have a 6BTA 270hp engine in my 2006 Nordic Tug 32+. Boat is in Northern Rhode Island, winterized and on the hard for the Winter. We had below zero temperatures the first week of January, and a few more days through January. Three weeks ago, checking on the boat, I noticed a small amount of antifreeze, maybe a couple of tablespoons, under the Twin Disc transmission. Check around engine. Couldnā€™t see any obvious source of leak. Wiped area dry. Yes…

      Started by: John in: Cummins Marine Engines

      8 Replies
      April 2, 2018 at 8:10 am Update… after removing cap on expansion tank and removing a little antifreeze, no additional leaking. I’ll assume freeze/thaw cycle caused pressure and forced some antifreeze out of hoses somewhere. Once in the water, I’ll watch it. Will check hoses and clamps more often, and release expansion tank cap next Fall as we go into Winter storage.

      Last Post by: John posted: 6 years ago

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Viewing 6 topics - 1 through 6 (of 6 total)