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    • Cummins Marine Forum Topics
    • No power to engine start panel

      This topic has 2 replies, has 3 voices, and was last updated byPaul Vlug 1 year ago

      August 20, 2022 at 3:48 pm Cummins QSB 6.7 2020, I have a 3 switch panel Enable,start and stop switches. My start switch was failing working sometimes sometimes not. Replaced the original with a blue seas switch. Tested a few times starting the motor a ok. Put the panel back together and then I lost power to panel. When I put the enable switch on I have no power to panel or my display. Checked all the conections , in line 50 amp fuse off the battery. Any help appreciated …

      Started by: Will in: Cummins Marine Engines

      2 Replies
      November 7, 2022 at 9:21 pm Hi, I had the same problem on my qsb6.7, started intermittently then a hard fault, turned out to be the cable from the engine to the helm ie to that switch panel, Cummins supplied a new 10 meter cable under warranty.

      Last Post by: Paul Vlug posted: 1 year ago

    • Wire length run

      This topic has 3 replies, has 2 voices, and was last updated bybluebyu 3 years ago

      February 23, 2021 at 1:03 pm 6.7 QSB series 31 battery Question…will a 20′ run of 4/0 wire to starter be ok ?

      Started by: Will in: Cummins Marine Engines

      3 Replies
      February 24, 2021 at 9:56 am Blue Sea Systems has a nice wire size calculator: http://circuitwizard.bluesea.com/# 40 feet is pushing the limits. the calculator shows 445 amps max at 10% drop. My 6CTA8.3 draws around 500amps at start. (plus 190 amps for the grid heater, which may be on a separate conductor) most likely it would work, but closer is much better. Hope this helps

      Last Post by: bluebyu posted: 3 years ago

    • Best spot for battery ground wire

      This topic has 2 replies, has 2 voices, and was last updated byWill 3 years ago

      May 15, 2020 at 3:15 am Wondering where the best spot for battery ground wire on QSB 6.7. Also what size wire is recommended for ground and positive side. I have a 31 series for my start battery. Positive run less that 3′ negative length will be determined where I ground to engine.

      Started by: Will in: Cummins Marine Engines

      2 Replies
      May 17, 2020 at 4:05 am New boat new motor. 2/0 wire heavy enough ? Thanks…

      Last Post by: Will posted: 3 years ago

    • Correct size sea strainer needed for QSB 6.7 480

      This topic has 7 replies, has 6 voices, and was last updated byRob Schepis 4 years ago

      December 19, 2019 at 3:41 pm Wondering what size strainer is recommended for QSB 6.7 480 hp

      Started by: Will in: Cummins Marine Engines

      7 Replies
      December 23, 2019 at 9:33 am Same here as Bill D – repowered in 2001 to include the Buck style bronze “squid screens” and no internal basket strainers. Zero issues. Simplifies and saves space in the engine room. https://www.sbmar.com/articles/thru-hull-screens-outside-strainers-or-squid-screens/

      Last Post by: Rob Schepis posted: 4 years ago

    • 5.9 QSB no power

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 5 years ago

      April 7, 2019 at 3:36 pm Hooked up charged battery today preparing for up coming season. Turn key no cycle of fuel pump nothing. Checked all 4 fuses all ok. Any ideas?

      Started by: Will in: Cummins Marine Engines

      1 Reply
      April 8, 2019 at 7:29 pm Lets “see what you are dealing with”.. 10-20 good pics as if I was in your engine room crawling around trying to find the “why”.. Then, tell me the history of this particular issue, & the total history of the engine and your use.. Tony

      Last Post by: Tony Athens posted: 5 years ago

    • Best power for Mitchel Cove 32 lobster boat

      This topic has 4 replies, has 3 voices, and was last updated byTony Athens 5 years ago

      March 16, 2019 at 4:08 pm Posted over on the general diss board hoping Tony will help out. Building a 32 Mitchell cove lobster boat 32×12 est weight to be 13000-15000lbs. Pleasure use approx 300hrs year. Looking for best cruise speed 22kts. Leaning towards QSB 480hp. Hull can swing 26″ blade. Engine and gear recommendations appreciated. Thanks…Will

      Started by: Will in: Cummins Marine Engines

      4 Replies
      March 17, 2019 at 8:27 am My vote would lean towards a QSB 6.7———The Rating you choose would be dependent upon your application, and your need to WOT speed on “show & tell day” vs. your needed cruise speed after the dust settles……….Regardless what what anyone else tells you, realistic or “usable” long range cruise speed making 30-100 miles runs is limited to about 16-17 GPH ( meaning about 350 HP).. That …

      Last Post by: Tony Athens posted: 5 years ago

    • Best power for Mitchel Cove 32 lobster boat

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

      March 12, 2019 at 8:17 am Boat is 32X12 lobster boat. Pleasure craft used for fishing less than 300hrs per season. Est weight 13000-15000lbs looking for most efficient cruise 22-23 kts . Hull can swing a 26″ wheel. Thanks…..

      Started by: Will in: General Discussion

      3 Replies
      March 13, 2019 at 2:56 pm I would think one of the higher HP QSB’s, possibly the 6.7, would be right. As to laying out the entire drivetrain (gear model, ratio, shaft dia and prop specs) that’s Tony’s forte……

      Last Post by: Rob Schepis posted: 5 years ago

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Viewing 8 topics - 1 through 8 (of 8 total)