Cummins 5405093 Cylinder Block for 4B B3.9 ISB 6B B5.9 B4.5 Engines

The Cummins 5405093 Cylinder Block is the strong base for 4B, B3.9, ISB, 6B, B5.9, and B4.5 marine diesel engines. It is the most durable option for tough marine applications. This OEM-grade block is made with precision and protects important parts from corrosion and high-pressure stresses that are prevalent in marine propulsion systems.

Specifications:

-> Part Number: 5405093 (cross-compatible: 4955412, 5302096, 4991099), designed for Cummins 3.9L-6.7L displacements.​

-> Material: Made of high-strength cast iron with built-in passageways for coolant and oil that help keep the temperature stable.

-> Engine Compatibility: 4B/B3.9 (3.9L), ISB/QSB (6.7L), 6B/B5.9/B4.5 (5.9L/4.5L) series used in workboats, tugs, and offshore vessels.

-> Dimensions: The shipment is 20 inches tall and the weight is optimized for marine engine overhauls (precise requirements according to Cummins EPA07 norms).

Benefits of Performance

• The reinforced webbing can bear very high maritime torque loads, and the precision-machined cylinder bores make sure that the pistons fit perfectly and wear very little.
• Integrated mounting points make it possible to replace Cummins parts directly in industrial, construction, and marine settings without any changes.
• Heavy-duty design and a finish that resists corrosion make these last longer in saltwater settings, which cuts down on downtime for commercial fleets.

Core Features:

• It has a single, solid frame that holds the pistons, crankshaft, connecting rods, and major bearings.
• Has oil galleries and water jackets that are precisely drilled for the best lubrication and cooling when running all the time.
• Meets or surpasses OEM standards, and the warranty lasts from 3 to 12 months, depending on the grade of the provider (OEM or aftermarket).

Perfect Marine Fit

The best replacement for old blocks in Cummins marine engines that power ferries, fishing boats, and supply ships. It brings back factory compression and power output.