| Configuration | In-line 6-cylinder, 4-stroke diesel |
| Bore & Stroke | 114 mm x 135 mm (4.49 in x 5.31 in) |
| Displacement | 8.3 L (505 in3) |
| Aspiration | Turbocharged/Aftercooled |
| Rotation | Counterclockwise facing flywheel |
- The 6CTA 8.3 (450 Diamond) is the most sought after marine diesel in both recreational and commercial markets
- Proven mid-range diesel platform with mid-stop wet liners, 12-valve design, and a simple to service top-end
- HX or Keel Cooling configurations / Seawater or Jacket Water Aftercooled
- The 6CTA 8.3 leverages a simple mechanical designed fuel injection system along with a base engine that can be rebuilt using common tools
Cummins 6CTA 480CE Turbo Banjo Leak Fix
This article shows pictures of how to fix and either clean or replace the problematic leaky banjo fitting on the Cummins 6CTA 8.3 M4 (480CE) Read More
The Cummins 6CTA 8.3 Marine Engine Story
The Cummins marine version of the 6CTA 8.3 has evolved through many versions and horsepower ratings since it was released in the early 1990’s (about 24 years ago) as a 6CTA 8.3M-1 “300C”, but all... Read More
Cummins Marine 6BTA 5.9 & 6CTA 8.3 Maintenance Procedures
General Information Perform maintenance at whichever interval occurs first. At each scheduled maintenance interval, perform all previous checks that are due for scheduled maintenance. Maintenance Procedures at Daily Interval Coolant Level – Check Fuel-Water Separator... Read More
Measuring Fuel Pressure on a Cummins 6CTA 8.3
Measuring fuel pressure on a Cummins 6CTA 8.3 taken from the on-engine fuel filter head. 20 PSI is measured at engine idle vs. 40 PSI at or around 2000 RPM Read More
How to Torque a Cummins Marine C-Series Cylinder Head
Post 1991 – Used Cylinder Block and Used Cap Screws The top of the cylinder head capscrew is identified with an angle marking. The cylinder head capscrews must be tightened by the five-step “torque... Read More
Cummins Marine 6CTA 450 Diamond with True 2 Micron Filtration
True 2 Micon Filtration for your 6BTA 270/330/370 or 6CTA 450 Diamond SMX Filter head & Fleetguard FF5488 “common rail” last chance filter Read More
Cummins Marine 6CTA 8.3 M4 (480CE) Stall Stumble ECM Fix
“IT WORKS! IT WORKS! As you predicted after the re-calibration engines are working like magic.” Those words came from a very happy boater who, despite Cummins resistance, and my help, had a simple fix successfully... Read More
Heater Hookup Ports for Your B & C Series Cummins
Above C series coolant return lines. Tee into either of these with a standard Brass Pipe Tee. The larger lower line will yield a higher flow. Read More
A Much Better Cummins Marine 6CTA 8.3 Gear Cooler Location
Placing the gear oil cooler in place of the factory fuel cooler accomplishes a couple things… #1 you remove the fuel cooler which, if you haven’t read the fuel cooler article, here it is: Understanding Marine... Read More
Cummins Marine EP9 Nippon Denso Fuel Solenoids
EP9 Fuel Solenoids There are two types of external fuel Nippon Denso EP9 injection pump solenoids that I have seen used on the marine engines by Cummins. Pics below: “NUB” style ... Read More
Boost Fitting Locations for B & C Series Marine Diesels
The following images depict the possible boost fitting locations & ports to obtain boost pressure readings from the engine’s intake manifold. Many of the ports can be tapped directly or also can be “tee’d” into... Read More
