Cummins QSK19 Engine Parts – Cylinder Head Section

The Cummins QSK19 aengine is a powerhouse built for the most demanding industrial applications, including marine vessels, mining trucks, power generation stations, and heavy-duty oil and gas equipment. At Diesel Pro Power, we provide a complete selection of cylinder head components for the Cummins QSK19 engine. Whether you're performing a top-end rebuild or replacing worn valve train components, this section includes all the parts you need—from fully assembled cylinder heads to individual guides, inserts, valves, and hardware.

With over 40,000 satisfied customers worldwide, Diesel Pro Power is the trusted source for high-quality Cummins QSK19 parts. Every component we offer is engineered for long-lasting performance, field-tested durability, and precise fitment.

Complete Cylinder Head Assemblies for Cummins QSK19

New Cylinder Head with Valves and Springs (Standard Version)

The standard new cylinder head for the QSK19 comes fully assembled with valves and springs installed. This version features traditional spring washers and is designed for engines operating under typical load conditions. It is ideal for applications where long service intervals and reliable performance are critical.

Key Features:

• Pre-installed valves and springs

• Compatible with QSK19 marine and industrial configurations

• Standard washer-based valve spring assembly

• Drop-in ready for fast installation

This head is often used in power generation, mid-load marine operations, and industrial compressors where the valve train does not experience extreme thermal cycling.

Premium Cylinder Head with Rotocoils

For high-performance applications, the premium QSK19 cylinder head comes pre-assembled with valves and springs but includes rotocoils (valve rotators) under the springs. This design improves valve rotation during operation, reducing wear from carbon buildup and heat concentration.

Recommended for:

• Continuous-duty marine propulsion

• High-load generator sets

• Heavy industrial engines in harsh environments

Benefits of rotocoil-equipped heads:

• Improved valve longevity under high thermal stress

• More even wear across valve seats

• Enhanced engine performance at higher operating temperatures

This version is compatible with many QSK19-based platforms, including some KTA19, KTA38, and KTA50 derivatives, depending on the configuration.

Cylinder Head Components and Supporting Hardware

Even if a full cylinder head replacement isn't required, rebuilding your top end with new supporting components can restore compression, prevent leaks, and ensure reliable valve operation. Below is a breakdown of critical QSK19 cylinder head parts available in our catalog.

Upper Gasket Sets

A complete upper gasket set is essential when removing or reinstalling the cylinder head. Our QSK19 upper gasket sets include all necessary seals and gaskets for the intake manifold, exhaust manifold, injector sleeves, rocker housings, and more.

We also carry upper gasket sets tailored for specific variants like the turbo-aftercooled version of the KTA19, which shares architectural similarities with the QSK19.

Cylinder Head Bolts

Cylinder head bolts play a crucial role in maintaining head-to-block clamping pressure. These bolts are torque-to-yield and should always be replaced when reinstalling the cylinder head.

Features:

• Engineered for high clamping force

• Corrosion-resistant finish

• Designed for QSK19 and compatible with many K-series engines

Each QSK19 cylinder head typically requires six bolts, and reusing old bolts is not recommended due to material stretch during previous torque cycles.

Valve Train Components

Intake and Exhaust Valve Kits

Our intake and exhaust valve kits are designed for engines using various control modules, including CM500, CM850, and CM2150. These kits contain:

• Precision-ground valve heads

• Hardened valve stems

• Proper seating profiles for QSK19 combustion chambers

The exhaust valves available use Inconel materials (coded as "U") to resist corrosion and pitting from high exhaust temperatures. Inconel valves are especially important for marine engines and generator sets operating under continuous load.

Valve Inserts

Valve inserts provide a wear-resistant surface between the valve and the cylinder head. These inserts are critical for long-term sealing, heat transfer, and valve seating integrity.

We offer:

• Intake valve inserts

• Exhaust valve inserts

Both types are designed to withstand repeated high-temperature cycles without deformation or material fatigue.

Valve Guides

Valve guides support the valve stems and maintain alignment during operation. Excessive play in worn guides can lead to poor combustion sealing, increased oil consumption, and accelerated valve wear.

Our guides are precision-machined to match the factory specifications for QSK19, K19, K38, and K50 engines. They are suitable for both intake and exhaust valve positions and compatible across generations of the engine platform.

Valve Spring Components

Retainers and Spring Guides

Top and bottom spring components ensure proper seating of the valve spring and prevent lateral movement during high-speed operation.

Available parts include:

• Top spring retainers for the K-series engine family

• Bottom spring guides specifically designed for QSK19 and larger displacement Cummins platforms

Valve Rotators

Valve rotators (or rotocoils) enhance valve longevity by rotating the valve slightly with each opening and closing cycle. This distributes heat and reduces hot spots that can lead to valve seat erosion.

Rotators are recommended for:

• Marine propulsion engines

• High-load gensets

• Any engine with extended duty cycles and narrow maintenance intervals

Push Rods and Rocker Arm Accessories

Push rods transfer motion from the camshaft to the rocker arms, making them integral to maintaining proper valve timing. We offer:

• Push rods for valve rockers

• Push rods for injector rockers

Made from hardened steel and balanced for optimal weight and length, these components maintain consistent valve timing and fuel delivery.

Rocker Lever Housing Gasket

This gasket seals the rocker lever housing and prevents oil leaks during valve actuation. A fresh gasket is necessary during top-end overhauls or when rocker assemblies are removed for inspection or servicing.

Head Gaskets for Cummins QSK19 Engines

Each QSK19 engine requires six cylinder head gaskets to seal the combustion chambers properly. These gaskets must withstand extreme pressure and thermal fluctuations.

We carry:

• Standard head gaskets for industrial and marine builds

• Turbo-aftercooled-specific gaskets for higher thermal output engines

Replacing head gaskets is recommended during any cylinder head service to ensure compression integrity and coolant/oil isolation.

Valve Crosshead Components

Valve Crosshead Brackets

These brackets distribute the force from the rocker arm across the valve stems in engines like the QSK19 and K-series. A properly functioning crosshead assembly reduces uneven valve wear and ensures simultaneous opening of paired valves.

Crosshead brackets are particularly critical in high-load diesel engines where multiple exhaust valves operate in tandem.

Temperature Sensors and Monitoring

For optimal performance, maintaining proper engine temperature is crucial. We offer a variety of temperature switches and sensors that help monitor and control engine cooling systems. These sensors are rated to close at 205°F and fit standard 1/2" NPT threads, making them compatible with most QSK19 installations.

Additional Components for QSK19 Cylinder Head Rebuilds

A proper cylinder head rebuild often includes tools and accessories that facilitate installation and service. Available items include:

• Feeler gauges for precise valve lash adjustment

• Valve spring compressors

• Injector rocker push rod alignment tools

• Torque wrenches and guides

By using the right supporting components and following Cummins torque specifications, you can ensure a leak-free, high-performance top-end rebuild.

Why Diesel Pro Power is the Trusted Source for QSK19 Cylinder Head Parts

With over 40,000 satisfied customers globally, Diesel Pro Power has built a reputation for reliability, speed, and accuracy. We understand the critical nature of QSK19-powered equipment and prioritize uptime above all else.

Benefits of sourcing your parts from us:

• Worldwide shipping with fast lead times

• Bilingual customer support (English and Spanish)

• Thorough catalog coverage for QSK19 and other Cummins heavy-duty engines

• Carefully curated rebuild kits and components tailored by CPL number