GM 6.6 Liter L5D V-8 Duramax Turbo Diesel Engine
The GM L5D Duramax is a turbo-diesel engine produced by General Motors for use in its new Medium Duty Class 4, 5 and 6 trucks. Displacing 6.6 liters in a V-8 configuration, the L5D is part of a new generation of Duramax engines.
The GM L5D engine made its debut in the 2019 Chevrolet Silverado Medium Duty trucks – the Silverado 4500HD, Silverado 5500HD, and Silverado 6500HD. It produces an estimated 700 pound-feet of torque and 350 horsepower.
The engine is closely related to the 6.6L Duramax V-8 L5P engine, but with a smaller turbo and a different tune. Chevrolet has told us that the L5D has “minor differences” from the L5P.
L5D specifications are currently not available, so we are providing specs for the closely-related L5P until we have more information on the L5D.
|Type||6.6L V-8 Turbo-Diesel|
|GM RPO Code||L5P|
|Valves Per Cylinder||4|
|Assembly Site||Moraine, Ohio, USA|
|Valve Lifters||Mechanical roller|
|Firing Order||1 – 2 – 7 – 8 – 4 – 5 – 6 – 3|
|Bore x Stroke||103 x 99 mm|
|Fuel System||Direct injection with high-pressure common rail|
|Fuel Type||Ultra-low-sulfur diesel and B20 biodiesel|
|Maximum Powered Speed||3450 rpm|
|Maximum Braking Speed||4800 rpm|
|Emissions Controls||Cooled Exhaust Gas Recirculation (EGR), Selective Catalytic Reduction (SCR), Diesel Particulate Filter (DPF), intake throttle|
|Cylinder Head||Cast aluminum|
|Intake Manifold||Cast aluminum|
|Exhaust Manifold||Cast nodular iron with steel pipe extension|
|Main Bearing Caps||Cast nodular iron|
|Connecting Rods||PM iron|
|Engine Oil Capacity||10 qt./9.5L|
|Vehicle||Transmission||Power (hp / kW) @ RPM||Torque (lb-ft / Nm) @ RPM|
|2019 Chevrolet Silverado 4500HD and newer||Allison Transmission (model TBD)||350||700|
|2019 Chevrolet Silverado 5500HD and newer||Allison Transmission (model TBD)||350||700|
|2019 Chevrolet Silverado 6500HD and newer||Allison Transmission (model TBD)||350||700|
|2019 International Trucks (model TBD) and newer||Allison Transmission (model TBD)||350||700|
The 6.6L Duramax L5D engine is manufactured at the GM Duramax plant in Moraine, Ohio, USA.
Follow our Duramax L5D news coverage.
GM L5D engine pictures coming soon.