Cummins QSB 6.7 Gaskets & Seals – Premium Aftermarket by Diesel Pro Power, Inc.

The Cummins QSB 6.7 engine depends on a network of precisely engineered gaskets, seals, and sealing compounds to operate at peak efficiency. In marine and industrial applications, where engines face constant vibration, saltwater exposure, and extreme temperature fluctuations, these sealing components are essential for preventing leaks, maintaining pressure, and ensuring long service life.

At Diesel Pro Power, Inc., we manufacture and supply premium aftermarket QSB 6.7 gaskets designed for exact fit, exceptional durability, and reliable performance in both commercial and recreational marine environments as well as stationary industrial setups. Our products are trusted by over 40,000 customers worldwide for their proven quality and long-term reliability.

Marine Water Pump & Cooling System Gaskets

Gasket to Mount the Marine Raw Water Pump

Engineered to create a leak-free seal between the QSB 6.7’s marine raw water pump and its mounting surface, this gasket withstands constant vibration and fluctuating marine temperatures. It ensures proper pump alignment and dependable seawater circulation.

Marine Water Pump O-Ring – Inlet & Outlet Seals

Specially molded O-rings that seal the inlet and outlet ports of the marine water pump, preventing seawater leakage and maintaining cooling efficiency.
Note: Two O-rings are required per engine.

Water Pump Seal Ring

Durable seal ring for the water pump assembly that protects against leaks at critical connection points in the cooling system.

Complete Engine Gasket Sets

Upper Gasket Set – Cummins QSB 6.7

A complete top-end sealing package that includes head gaskets, intake and exhaust manifold gaskets, valve cover gaskets, and more. Perfect for cylinder head replacement, top-end overhauls, or repairs after overheating.

Lower Gasket Set – Cummins QSB 6.7

Covers the lower portion of the engine, including the oil pan gasket, crankshaft seals, and related bottom-end sealing components. Often used in full engine rebuilds or to address lower-end oil leaks.

Lubrication System Gaskets

Oil Pan Gasket

Provides a secure, oil-tight seal between the oil pan and engine block, built to resist heat, vibration, and oil exposure over extended service intervals.

Gasket for Oil Pick-Up Tube – 4B, 6B, ISB, QSB Engines

Ensures proper suction in the lubrication system by preventing air intrusion into the oil pickup tube.

Gasket for Oil Cooler Cover

Prevents oil leaks and ensures optimal heat exchange efficiency in the oil cooler assembly. Available in multiple configurations, including a metal-core oil cooler core gasket for high-pressure sealing.

Turbo Oil Drain Gasket

Seals the turbo oil drain tube to the engine block, preventing leaks that could compromise lubrication or turbocharger operation.

Air Intake & Exhaust Gaskets

Intake Manifold Cover Gasket

Prevents air leaks from the intake manifold cover, ensuring consistent airflow and optimal combustion efficiency.

O-Ring for Aftercooler

Seals the aftercooler-to-intake connection to maintain boost pressure and prevent performance-robbing air leaks.

Fuel System Gaskets

Fuel Transfer Pump Gasket

Seals the fuel transfer pump to prevent diesel leaks and maintain proper fuel delivery pressure. Two are required per pump.

Fuel Injection Pump Gasket

Provides a secure seal for the fuel injection pump, preventing leaks that could reduce efficiency or damage surrounding components.

Cylinder Head & Valve Train Gaskets

Valve Cover Gasket – ISB & QSB 6.7

Seals the valve cover to the cylinder head, preventing oil leaks and maintaining cleanliness in the upper engine area.

Cover Plate Gasket

Seals auxiliary cover plates to prevent oil seepage and protect internal components.

Thermostat & Cooling System Seals

Thermostat Seal – ISB & QSB Engines

Prevents coolant leaks at the thermostat housing, ensuring consistent engine operating temperature.

Specialty Sealants & Gasket Makers

Even with premium aftermarket gaskets, certain areas require specialized sealants for extra protection. Diesel Pro Power offers marine-grade sealants formulated for Cummins QSB 6.7 service:

• 762 Hi-Temperature Jointing Compound – Handles up to 760°C for turbo and exhaust applications.
  
  

• High Tack Gasket Spray – Holds cut gaskets in place during assembly.
  
  

• 3H Gasket Maker – Liquid sealant for oil, coolant, and fuel contact areas.
  
  

• High Strength Threadlocker (Red) – Prevents fastener loosening in vibration-heavy environments.
  
  

• Silicone Gasket Makers – Standard, high-temp, and ultra-blue sensor-safe options for various engine sealing needs.
  
  

• Non-Hardening Pliable Sealant – Flexible sealing solution that resists cracking.
  
  

• J-B Weld Cold Weld – Two-part epoxy repair for permanent metal bonding.
  
  

Why Choose Diesel Pro Power QSB 6.7 Gaskets?

• Exact Fit Engineering – Manufactured to match Cummins QSB 6.7 specifications for quick, precise installation.
  
  

• Marine & Industrial Durability – Designed to resist saltwater corrosion, heat cycling, and vibration damage.
  
  

• Full Product Range – From complete gasket kits to individual sealing components for targeted repairs.
  
  

• Trusted Worldwide – Proven in vessels, generators, and industrial engines across over 40,000 customer applications.