Cummins QSK19 Engine Overhaul Kits & Parts Catalog

Engine Overview: Cummins QSK19

The Cummins QSK19 is a powerful 19-liter, six-cylinder diesel engine built to endure the most demanding applications across industrial, mining, locomotive, and marine markets. As part of Cummins’ Quantum Series, the QSK19 leverages electronic control systems and advanced combustion technology to deliver optimal performance, fuel efficiency, and long service intervals.

Designed as a heavy-duty evolution of the KTA19, the QSK19 incorporates high-pressure fuel injection, dual overhead camshafts (in certain variants), and a modular common rail system in later generations. This engine typically produces between 675 and 950 horsepower depending on the configuration, with reliable torque curves suited for both continuous duty and peak-load conditions.

Whether you operate a QSK19 in a mining haul truck, marine propulsion system, or rail generator set, its longevity and output depend on periodic inframe overhauls with high-quality rebuild kits. Diesel Pro Power proudly stocks complete overhaul kits, tools, gaskets, filters, and components to keep your QSK19 running like new.

Rebuild Kit Options for Cummins QSK19 Engines

Inframe Overhaul Kit with 13.9:1 Compression Ratio

One of the most widely used configurations of the QSK19 engine features a 13.9:1 compression ratio. This specification represents the ratio of the total cylinder volume when the piston is at the bottom of its stroke compared to when it’s at the top. A 13.9:1 compression ratio is common for engines designed to operate at high loads with efficient fuel burn and reduced exhaust emissions.

These kits are compatible with a long list of CPL (Control Parts List) numbers, including:

• 1170, 1253, 1319, 1438, 1455, 1528, 1541, 1542, 1543, 1544, 1756, 2159, 2163, 2227, 2533, 2635, 2983, 3708, 3855, 3947, 4153, 4227, 4305, 4452, 4574, 4696, 4892, 4893, 6229, 6240, 8609, 8687, 8712

Each kit includes:

• Pistons (13.9:1 compression)

• Cylinder liners and seals

• Piston rings

• Wrist pins and retainers

• Connecting rod bearings

• Main bearings

• Thrust washers

• Upper and lower gasket sets

These inframe kits are ideal for field rebuilds where the engine block remains in the chassis. The components are designed to meet or exceed OEM specifications.

Inframe Overhaul Kit with 15.5:1 Compression Ratio

For applications requiring slightly higher thermal efficiency and improved combustion pressure, the 15.5:1 compression kit delivers more power from the same displacement. This higher ratio can increase performance while requiring precise cooling and lubrication to maintain durability.

Compatible CPLs include:

• 810, 865, 901, 975, 976, 2560, 4192, 4193

This rebuild kit includes one-piece pistons engineered for high-compression operation. The use of one-piece over two-piece pistons can reduce piston slap and minimize wear over extended duty cycles.

Additional QSK19 Rebuild Kit Option for Specific CPLs

Diesel Pro Power also offers an alternative overhaul kit tailored to the following CPLs:

• 2008, 2009, 2010, 2090, 2091, 2225, 2558, 2560, 2810, 8079

These kits may incorporate specialized components such as redesigned piston crowns, updated bearings, and modernized liner architecture. Depending on the CPL, your engine may also include newer emissions control strategies or variations in turbocharging and fuel delivery systems.

Key Components Supporting Your Overhaul

Piston Cooling Nozzles

The piston cooling nozzles (six required per engine) are critical for QSK19 engines. These nozzles direct pressurized oil onto the underside of each piston to prevent overheating, reduce thermal stress, and ensure longer service life. If you are completing an inframe overhaul, it's highly recommended to inspect and replace these nozzles to prevent future piston scuffing or oil starvation.

Turbo Mounting Gasket

The turbocharger mounting gasket ensures a secure, leak-free connection between the turbo and the manifold. This part is especially important in high-pressure systems like the QSK19. Over time, these gaskets can crack or corrode due to intense heat cycles. A new gasket prevents exhaust leaks that could reduce boost efficiency and increase emissions.

Exhaust Manifold Outlet Gasket

This gasket forms a seal between the manifold outlet and the exhaust piping. A proper seal keeps the turbo operating at full potential and prevents backpressure, which can reduce engine performance and cause turbocharger failure over time. Always inspect the exhaust manifold surface and mating flange when replacing this gasket.

Filtration Components for Engine Longevity

Cummins Oil Filter

The oil filter in the QSK19 plays a vital role in maintaining engine health. Designed as a high-capacity, spin-on type filter, it ensures contaminants and debris are captured before recirculating through the lubrication system. This model includes:

• 4.65" diameter

• 11.69" height

• Thread size: 2 1/4" - 12 UN

Always change the oil filter during an inframe rebuild or regular oil service to protect the engine from accelerated wear.

Fuel Filter & Water Separator

Water in diesel fuel can quickly lead to injector damage, corrosion, and poor combustion. The QSK19 rebuild section includes two fuel filter/water separator options:

• 3329289: 3.66" diameter, 9.92" height, 1-14 UN thread

• 3313304: Larger variant with 4.65" diameter, 10.24" height, 1/4" - 12 UN thread

These filters should be replaced during rebuilds and at scheduled intervals during engine operation.

Essential Tools for QSK19 Maintenance

Feeler Gauge for Valve Adjustment

Valve clearance plays a major role in engine performance, fuel economy, and longevity. Our .002" to .025" feeler gauge allows precise calibration of intake and exhaust valve lash during engine reassembly.

Piston Ring Assembly Tool

Installing piston rings without damaging them is critical. Our ring compressor tool ensures rings slide effortlessly into the cylinder liner during installation—minimizing the chance of ring breakage or deformation.

Filter Removal Wrenches

Diesel Pro Power offers two sizes of removal wrenches:

• Fuel filter wrench: Fits 3-7/16" to 3-3/4" filters

• Oil filter wrench: Fits 4-21/32" to 5-5/32" filters

These tools make filter changes easier and reduce the risk of housing damage during removal.

Cooling System Maintenance

Radiator Cleaner

An often-overlooked component of engine overhaul is the cooling system. Our radiator cleaner helps flush deposits, rust, and scale buildup to restore proper coolant flow and temperature regulation. This product is ground-shipping only and available in the USA and Canada.

Temperature Switch

This switch activates at 205°F to protect your QSK19 from overheating. It is compatible with Detroit Diesel, Cummins, and Caterpillar engines and features a 1/2" NPT thread for direct replacement.

Instrumentation & Gauges

Monitoring your engine’s operating conditions is essential after a rebuild. Diesel Pro Power offers a complete range of:

• Mechanical gauges (standard)

• Mechanical gauges with built-in alarm functions

• Electrical gauges (12V and 24V)

These instruments cover oil pressure, coolant temperature, boost pressure, fuel levels, and more.

Choosing the Right Kit for Your CPL Number

When selecting a rebuild kit for your QSK19, identifying the correct CPL (Control Parts List) number is critical. Each CPL defines the exact configuration of your engine—including fuel system, camshaft profile, pistons, and emissions setup. Using the wrong kit can result in fitment issues, improper combustion, or early failure.

You can find your CPL number on the engine dataplate located on the gear housing or valve cover. If unsure, contact Diesel Pro Power for guidance—our technical team is here to match you with the correct overhaul kit and supporting components.

Why Choose Diesel Pro Power for Your QSK19 Rebuild?

• Trusted by Over 40,000 Customers Worldwide
  We proudly serve commercial fleet operators, industrial powerhouses, and marine customers around the globe with premium Cummins parts.

• Extensive Inventory
  All overhaul kits and replacement parts listed are in stock and ready to ship, minimizing your downtime.

• Technical Expertise
  Our team understands the complexity of QSK engines and can support you with component selection, compatibility checks, and rebuild best practices.

• Bilingual Support
  We serve customers in English and Spanish, providing a global reach with localized customer service.