Cummins QSX Parts - Gasket Section

Cummins QSX Gasket Sets and Sealants – Full Catalog

When maintaining or overhauling a Cummins QSX engine, precision sealing is critical to ensure reliability, performance, and longevity. Diesel Pro Power provides a comprehensive selection of QSX-compatible gaskets, gasket sets, and sealants designed for engines both with and without EGR systems. Whether you're rebuilding the top end, sealing the oil pan, or refreshing your turbo connection, our gasket catalog has the exact solution for your QSX powerplant.

We serve over 40,000 satisfied customers worldwide with fast shipping, expert support, and factory-tested parts.

Upper Gasket Sets for Cummins QSX Engines

Upper Gasket Set – For Non-EGR QSX Engines

Designed for QSX engines without EGR (Exhaust Gas Recirculation) systems, this upper gasket set includes all necessary components to reseal the cylinder head area. These gaskets are manufactured using high-grade materials that can withstand the high compression and temperature cycling that’s standard in high-output QSX engines.

Includes:

• Cylinder head gaskets
  
  

• Valve cover gaskets
  
  

• Intake and exhaust manifold gaskets
  
  

• Injector seals
  
  

• EGR delete compatible configuration
  
  

Best Use Case: Ideal for industrial and marine QSX applications where EGR systems are not present or have been removed for compliance or maintenance simplicity.

Upper Gasket Set – For EGR-Equipped QSX Engines

This version includes the necessary gaskets and seals to service the upper section of a QSX engine that is equipped with an EGR system. It includes EGR cooler gaskets, valve seals, intake/exhaust gaskets, and related seals.

EGR Compatibility: The included materials are designed to withstand corrosive EGR condensates and fluctuating exhaust temperatures, helping prevent premature gasket failure.

Lower Gasket Sets for Cummins QSX Engines

Complete Lower Gasket Set – Non-EGR Engines

This lower gasket set contains everything needed to reseal the bottom half of the engine, including:

• Oil pan gaskets
  
  

• Rear main seal
  
  

• Front crank seal
  
  

• Gear housing gaskets
  
  

• Flywheel housing gaskets
  
  

Application Note: Designed for QSX and ISX variants that do not use an EGR system. Pair this with the appropriate upper gasket set for a complete engine reseal.

Individual Gaskets and Seal Strips

For users performing targeted repairs or replacements, Diesel Pro offers individual gaskets specifically made for the QSX engine series.

Oil Pan Gasket – QSX / ISX Engines

Durable, oil-resistant gasket that provides a reliable seal between the oil pan and engine block. Designed to withstand pressure fluctuations and vibration in heavy-duty applications.

Gear Housing Gasket – QSX / ISX Engines

Essential for sealing the timing gear cover housing. Prevents oil leaks from the front timing assembly.

Valve Cover Gasket – QSX / ISX Engines

Seals the rocker cover and keeps oil inside the valve train. Manufactured from heat-resistant elastomer materials that maintain flexibility over time.

Front Cover Seal Strips

These strips seal the front gear cover and are essential for preventing oil leaks at the camshaft and crankshaft front seals.

• Upper Front Cover Seal Strip: Installs at the top of the gear cover.
  
  

• Lower Front Cover Seal Strip: Installs at the base of the gear housing.
  
  

Both components are recommended during timing gear service or front-end disassembly.

Flywheel Housing Gasket

Designed to prevent leaks at the rear of the engine where the flywheel housing bolts to the block. A precise fit reduces the chance of oil seepage into the bell housing, a common issue with misaligned or reused gaskets.

Turbo Gasket – Cummins QSX

A high-temperature metal/composite gasket designed to seal the turbocharger to the exhaust manifold or turbine housing. Withstands extreme heat, vibration, and pressure common in high-load turbo applications.

Oil Cooler Housing Gasket – Cummins QSX

This gasket seals the interface between the oil cooler housing and the engine block. Critical for maintaining oil pressure and preventing coolant or oil crossover leaks.

Professional-Grade Gasket Sealants and Tools

Diesel Pro offers a range of gasket makers, sealants, and jointing compounds tailored for Cummins and Detroit Diesel engine applications. These are especially useful during overhaul work on high-performance engines like the QSX.

High-Temperature Jointing Compound

This silkolene-based paste is ideal for sealing metal-to-metal turbo flanges, exhaust manifolds, or other high-temperature mating surfaces. Temperature rated up to 760°C (1400°F).

Gasket Spray – High Tack Sealant

Spray-on sealant designed to bond and hold gaskets in place during installation. Ideal for larger gaskets such as the oil pan or timing cover where shifting during torqueing can be an issue.

Liquid Gasket Makers – Silicone, RTV, and Pliable Options

We carry several types of RTV silicone sealants:

• Sensor-Safe Blue RTV
  
  

• High-Temperature Red RTV
  
  

• Ultra Blue RTV
  
  

• Non-Hardening Pliable RTV
  
  

These sealants are used in corners, irregular sealing surfaces, and as a standalone solution in select applications (such as thermostat housings or gear covers).

Threadlocker and Adhesives for Cummins QSX Assembly

Red Threadlocker – High Strength

Used to secure bolts that must not loosen under vibration, especially in critical engine components like gear covers or flywheel housing bolts.

J-B Weld – Cold Weld

An industrial-grade epoxy adhesive ideal for metal repair or filling small cracks in non-moving components.

Which Gasket Do You Need for a Cummins QSX Engine?

Selecting the right gasket depends on your engine’s configuration (EGR vs. Non-EGR) and the scope of your rebuild or repair. Here's a quick reference:

Why Diesel Pro Power?

With over 40,000 satisfied customers and a global distribution network, Diesel Pro Power is the trusted source for Cummins QSX gasket sets and sealing components. Our parts are:

• In stock and ready to ship
  
  

• Backed by expert customer service
  
  

• Designed for industrial-grade performance
  
  

Whether you’re operating a QSX15 in a marine generator, industrial pump, or mining application, these gaskets are built to perform under high pressure, high heat, and long service intervals.