Cummins 6B Engine Parts – Gasket Section

The Cummins 6B engine gasket system plays a vital role in sealing fluids, containing combustion pressure, and preventing harmful leaks in both marine and industrial applications. From exhaust manifold gaskets that withstand extreme heat to precision O-rings that keep cooling systems leak-free, each gasket in the 6B series is engineered to meet or exceed Cummins’ stringent OEM standards.

Whether you’re performing a top-end refresh, replacing the marine water pump, or conducting a complete overhaul, Diesel Pro Power offers an extensive selection of Cummins 6B engine gaskets for every system—trusted by over 40,000+ satisfied customers worldwide.

Exhaust System Gaskets for Cummins 6B

Exhaust Manifold Gasket

The exhaust manifold gasket seals the connection between the cylinder head and exhaust manifold, preventing hot combustion gases from escaping and maintaining proper exhaust flow. In marine applications, where salt air and moisture accelerate corrosion, high-quality manifold gaskets are essential for reliable long-term performance.
This gasket is designed to resist warping and blowouts, even under repeated thermal cycling.

Exhaust Manifold Outlet Connection Gasket

This gasket ensures a tight seal at the manifold’s outlet, maintaining back-pressure balance and preventing exhaust leaks into the engine compartment—a crucial safety measure in enclosed marine spaces.

Marine Water Pump & Cooling System Gaskets

Gasket to Mount the Marine Raw Water Pump

When servicing the raw water pump, this mounting gasket provides a watertight seal between the pump and its mounting surface. A precise fit prevents saltwater leakage that could damage surrounding components. This gasket is designed specifically for marine cooling systems and is resistant to saltwater corrosion.

Marine Water Pump O-Ring

Each Cummins 6B raw water pump requires two O-rings to seal inlet and outlet ports. These O-rings ensure there is no loss of cooling water pressure, which is vital for preventing overheating in both marine and stationary industrial engines.

Water Pump Seal Ring

The water pump seal ring forms a secondary barrier against coolant leakage, extending pump service life and ensuring efficient coolant circulation.

Heat Exchanger O-Ring Gasket Seal

For engines equipped with heat exchangers, this O-ring seal ensures that coolant remains contained within the exchanger housing, preventing cross-contamination between coolant and raw seawater.
Two seals are required per engine for full service.

Full Engine Gasket Sets

Upper Gasket Set – Standard & Oversize

The upper gasket set includes head gaskets, intake and exhaust gaskets, and other top-end seals. Diesel Pro Power offers both standard and oversize 0.25 mm configurations to accommodate engines that have undergone head or block resurfacing. These sets are ideal for major top-end rebuilds, ensuring all mating surfaces are sealed to OEM specifications.

Lower Gasket Set – Front Gear Train Engines

The lower gasket set includes oil pan gaskets, crankshaft seals, and other bottom-end sealing components. Specifically designed for Cummins 6B engines with a front gear train, these sets are essential for complete overhauls.

Fuel System Gaskets

Fuel Transfer Pump Gasket

Two gaskets are required for each fuel transfer pump to maintain a secure, leak-free seal. Proper sealing in the fuel system prevents fuel delivery issues and protects against contamination.

Fuel Injection Pump Gasket

Seals the connection between the fuel injection pump and its mounting surface, maintaining precise fuel pressure and timing—critical for efficient combustion and power output.

Turbocharger & Aftercooler Gaskets

Turbo Mounting Gasket – Water-Cooled Turbos Only

For Cummins 6B engines with water-cooled turbochargers, this gasket ensures a secure, leak-free interface between the turbo and exhaust manifold. It is built to withstand high exhaust temperatures and the additional cooling demands of water-cooled systems.

O-Ring for Aftercooler

Seals the aftercooler assembly to maintain optimal charge air temperature and prevent boost leaks. Proper sealing improves performance, fuel efficiency, and emission control.

Oil & Lubrication System Gaskets

Oil Pan Gasket

Prevents oil leakage at the oil pan joint, ensuring proper lubrication of the crankshaft and bearings. Built with heat-resistant materials to withstand prolonged exposure to hot engine oil.

Oil Cooler Core Gasket

Seals the oil cooler core to prevent cross-leaks between engine oil and coolant. This is a critical gasket for maintaining both lubrication and cooling system integrity.

Thermostat & Housing Gaskets

Thermostat Seal

A compact but essential component, the thermostat seal prevents coolant leaks around the thermostat housing, ensuring precise engine temperature regulation.

Thermostat Housing Gasket

Provides a reliable seal between the thermostat housing and engine block or manifold. This prevents coolant loss and ensures accurate temperature control in both fresh and saltwater cooling systems.

Gasket Adhesives & Sealants for Cummins 6B

Alongside OEM gaskets, Diesel Pro Power offers a full range of sealants, adhesives, and gasket makers designed for Cummins 6B engine service:

• High Tack Gasket Spray – Holds gaskets in place during assembly while sealing minor imperfections.

• 3H Liquid Gasket Maker – Flexible sealing for irregular surfaces.

• High-Strength Threadlocker (Red) – Secures bolts in high-vibration environments.

• Sensor-Safe Silicone Gasket Maker – Ideal for electronics-equipped engines.

• Cold Weld Compound – Metal-reinforced repair epoxy for emergency fixes.

• High-Temp RTV Silicone Gasket Maker – Withstands extreme exhaust temperatures.

• Ultra Blue RTV Silicone (Sensor Safe) – Provides a long-lasting flexible seal.

• Non-Hardening Pliable Sealant – Stays flexible for parts that require periodic disassembly.

Why Diesel Pro Power Gaskets for Cummins 6B?

• Exact OEM Fit – Precision-engineered to Cummins specifications.

• Marine-Grade Materials – Designed to resist saltwater corrosion and high-temperature degradation.

• Comprehensive Coverage – From single gaskets to full top- and bottom-end sets.

• Global Shipping – Fast delivery to ports, shipyards, and industrial sites worldwide.

• Proven Reliability – Trusted by over 40,000+ satisfied customers.