GIBY is now a Cummins Dealership!

Great Island Boat Yard is now a Maintenance Level Cummins Engine Dealer, as well as a Maintenance Level Onan Marine Generator Dealer.  This dealership gives our technicians access to world class Cummins and Onan Technical Training, and allows us the rights to use a Cummins/Onan diagnostic laptop to troubleshoot even the most complex engines and generators in the Cummins family.  Our techs are very excited to be at the forefront of Electronic Diesel Technology.

  • We’re in the process of becoming certified to handle maintenance, warranty and repairs on Cummins QSB 5.9, QSB 6.7, QSC 8.3, QSL 9 and QSM 11 Electronic Engines, as well as the older Mechanical Engines and Zeus Drives.
  • We’re also working towards certification in the full line of marine Onan Generators.
  • This means we’ll now be able to offer our customers full service and parts support for ALL Cummins and Onan products.

Recent Cummins Projects at Great Island Boat Yard:

  • Winter 2013-14:  Repowered a Susi 30′ Lobster Boat with a QSB 5.9 350hp Cummins Common Rail Engine
  • Winter 2014-15:  Plans to purchase and install a QSC 8.3 500hp Cummins Common Rail Engine in a 42′ Hinckley Talaria power yacht


  • Cummins is currently running a “Repower With New” Program which allows dealers to offer rebates up to $7,000 for single engine installs, and up to $14,000 on twin engine installs depending on the engine selection.  This is a great opportunity to save some some serious money while upgrading your engines!


Chuck Tarbox

Looking to repower my lobster boat over the Winter months wondering if that is something you would be interested in doing! I have a 28 ft BHM that has a 220 hp Isusi


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