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Cummins 4B Engine Parts - Gasket Section
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Cummins 4B Gaskets & Sealants Catalog
Premium Gaskets and Sealing Components for Cummins 4B Engines
Diesel Pro Power offers a complete selection of gaskets, seals, and high-temperature adhesives specifically engineered for the Cummins 4B 3.9 engine platform. These components ensure long-term reliability, thermal protection, and superior fluid containment in both marine and industrial applications.
Exhaust Manifold Gaskets for Cummins 4B
Exhaust Manifold Gasket (Cummins 4B / 4BT)
This gasket creates a high-temperature seal between the exhaust manifold and cylinder head, preventing exhaust gas leaks and maintaining engine performance. It’s a critical component for emissions control and turbocharger efficiency. Made from multi-layered steel for durability and heat resistance.
Water Pump Mounting Gaskets
Gasket to Mount Marine Raw Water Pump
Specifically designed for Cummins 4B marine cooling systems, this gasket provides a secure, watertight seal between the raw water pump and the engine block or mounting surface. Resistant to saltwater corrosion, it supports the longevity of your marine cooling setup.
Upper Gasket Sets for Cummins 4B Series
Standard Upper Gasket Set for Cummins 4B / 4BT / 4BTA
This comprehensive upper gasket kit includes all essential gaskets and seals for the top end of the engine, including the cylinder head gasket, valve cover gasket, intake and exhaust manifold gaskets, and more. Perfect for head service, top-end rebuilds, or preventive maintenance.
Oversize Upper Gasket Set – 0.25 mm
Designed for engines that have been decked or resurfaced, this oversize upper gasket set compensates for the material removed during machining. Ideal for rebuilds requiring precise fitment and reliable sealing.
Lower Gasket Sets for Cummins 4B Series
Lower Gasket Set for Cummins 4B / 4BT
Includes gaskets and seals for the oil pan, front and rear gear covers, oil cooler, and other critical lower-engine components. This kit is essential for full engine rebuilds or resealing the bottom end of the engine to stop oil leaks and ensure crankcase integrity.
Cylinder Head Gaskets for Cummins 4B and 4BT
Head Gasket – Standard for Cummins 4B3.9 / 4BT3.9
Manufactured with multi-layered steel construction to withstand combustion pressure and thermal cycling. This standard head gasket ensures a tight seal between the cylinder head and block, crucial for compression retention and coolant separation.
Oil Pan Gaskets
Oil Pan Gasket for Cummins 4BT
Formed from durable composite or molded rubber materials, this gasket ensures a leak-free seal between the oil pan and engine block. Designed to handle constant exposure to engine oil and temperature fluctuations, it's a key part of the engine's bottom-end sealing system.
Fuel System Gaskets
Fuel Transfer Pump Gasket (4BT and Others)
Used in pairs on some Cummins fuel transfer pumps, this gasket provides a leak-proof seal that prevents diesel fuel seepage and ensures consistent pump operation. Compatible with multiple Cummins models including 4BT, 6BT, and ISC.
Fuel Injection Pump Gasket for Cummins 4B / 4BT / 4BTA
Essential for maintaining pressure in the fuel system, this gasket is located between the fuel injection pump and mounting flange. A must-have when servicing or replacing the injection pump to prevent fuel leaks and preserve timing accuracy.
Oil Cooler and Filter Gaskets
Designed to seal the oil cooler housing and core, this gasket maintains engine oil integrity and keeps coolant and oil separated within the system. Precision-fit for Cummins 4B engines to ensure long-term performance and prevent internal leaks.
Filter Head Gasket – Cummins 4B / 6B
This gasket seals the engine oil filter head to the block or mounting plate. It's critical to preventing pressurized oil leaks and maintaining proper oil flow throughout the lubrication system.
Thermostat & Cooling System Gaskets
Thermostat Seal – ISB / QSB / 4B Compatibility
A precision-molded rubber seal that ensures a tight fit around the thermostat, helping regulate coolant flow accurately and prevent leaks in high-temperature environments.
This flat gasket seals the thermostat housing to the engine and is critical during coolant system maintenance or thermostat replacement. Compatible with 4B, 4BT, and other B-Series configurations.
Heat Exchanger & Cooling Gaskets
Heat Exchanger O-Ring Gasket (2 per Engine)
These O-ring style gaskets are used in marine applications to seal the raw water heat exchanger, keeping saltwater and coolant paths separated. Designed for Cummins 4B, 4BT, 4BTA, 6B, and 6BT engines.
Gasket Sealants & Adhesives for Cummins 4B Engines
High-Performance Gasket Makers, Sealants, and Threadlockers
Diesel Pro Power also offers a full line of professional-grade sealants and adhesives engineered to complement Cummins gasket kits. These are ideal for rebuilds, field service repairs, and long-term reliability.
Gasket Sprays & Sealants
High-Tack Gasket Spray Sealant
Designed to "hold and seal" cut or composite gaskets in place during installation. Offers superior adhesion and oil resistance. Ideal for sealing oil pans, valve covers, and timing gear housings. Safe for Cummins and Detroit Diesel engines.
Flexible and oil-resistant, this liquid sealant works well on irregular surfaces and flange joins. It’s a versatile product trusted by marine and industrial engine rebuilders.
Thread Lockers & Seal Compounds
High-Strength Threadlocker – Red Formula
Ideal for securing bolts and fasteners that are subject to vibration or thermal cycling. Commonly used on head bolts, rocker arms, or exhaust brackets on Cummins 4B engines.
RTV & Silicone Gasket Makers
Sensor-Safe Silicone Gasket Maker
This low-odor RTV is designed for use around engine sensors. Suitable for timing covers, valve covers, and thermostat housings, offering a flexible seal that doesn’t interfere with electronics.
Withstands extreme heat for sealing turbocharger flanges, exhaust manifolds, and EGR components. Maintains flexibility under high thermal loads.
Ultra Blue RTV Silicone – Sensor Safe
Combines excellent oil resistance with a sensor-safe formulation. Ideal for use in electronic-heavy diesel engine environments.
Pliable & Non-Hardening Gasket Compounds
Non-Hardening Pliable Gasket Maker
Remains flexible after application, allowing for movement between metal surfaces. Used for sealing surfaces that may require periodic disassembly or inspection.
Cold-Weld Compounds
A two-part epoxy used for repairing cracked housings or sealing oil or coolant leaks in emergency situations. Compatible with both Detroit Diesel and Cummins engine components.
Why Quality Gaskets Matter on the Cummins 4B
A small leak in a gasket can lead to a major failure if left unchecked. Whether you're replacing a single component like an exhaust manifold or doing a full top-to-bottom rebuild, quality gaskets play a vital role in:
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Maintaining combustion pressure
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Preventing oil and coolant leaks
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Reducing wear from contamination
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Preserving turbo and injector performance
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Supporting marine and industrial reliability
All gaskets offered by Diesel Pro Power are designed to meet or exceed OEM standards. Each component is selected for maximum durability, chemical resistance, and ease of installation in real-world marine and industrial environments.
