Cummins QSX Parts for Canada - Rebuild Kit Section

Overhaul Kits for Cummins QSX Engines

Comprehensive Engine Rebuild Solutions for High-Horsepower Applications

The Cummins QSX series engines are among the most robust heavy-duty diesel engines in the Cummins family, designed to meet the demands of off-highway, construction, mining, and industrial sectors. When it’s time for a major service or complete rebuild, having the right overhaul kit is critical to restoring full engine performance, minimizing downtime, and maximizing reliability. Diesel Pro Power offers a complete range of Cummins QSX rebuild kits designed to match OEM quality and durability while supporting multiple CPL configurations and piston types.

Full Engine Overhaul Kit with 2-Piece Pistons for Cummins QSX

This kit is designed for QSX engines equipped with two-piece articulated pistons—ideal for specific CPL configurations such as 2825, 8081, 8142, 8469, 8571, 8587, and 8588. These pistons are typically used in QSX applications where high thermal load tolerance is required, such as in continuous-duty generators, oilfield support rigs, and large off-road vehicles. The articulated design allows for improved resistance to scuffing and expansion during extended operation.

Kit Includes

• Pistons (2-piece style)

• Piston pins and retainers

• Piston rings

• Cylinder liners

• Connecting rod bearings

• Main bearings

• Thrust washers

• Full upper gasket set

• Full lower gasket set

• Seals for front and rear crankshaft

• Camshaft bushings

• Timing cover and housing gaskets

All components are manufactured to ISO and OEM-level standards to ensure tight tolerances and long-term reliability.

Piston Cooling Nozzles for Cummins QSX

Maintaining proper piston cooling is essential during a rebuild, especially for engines operating in severe-duty cycles. Each Cummins QSX engine requires six piston cooling nozzles to direct engine oil to the underside of the pistons. These nozzles help reduce thermal load and maintain piston skirt integrity. It’s strongly recommended to replace all six during a major rebuild to avoid potential failures caused by clogged or weakened nozzles.

Crankshaft Seal Kits – Front & Rear

A thorough rebuild requires resealing both ends of the crankshaft. The front crankshaft seal kit includes the front main seal and installation sleeve to restore factory sealing performance and prevent oil leakage at the timing gear housing.
The rear crankshaft seal kit performs the same function at the flywheel housing and includes an updated sleeve to prevent recurring wear issues.

Oil and Fuel Filtration Components

Every engine overhaul should include a fresh set of oil and fuel filters to ensure no contaminants remain in the system after reassembly.

Oil Filter for Cummins QSX

The QSX oil filter is a spin-on, high-capacity filter designed for extended change intervals and higher flow rates, with optimized filtration for the QSX’s large displacement and oil volume. The correct filter will ensure proper lubrication from startup through full-load operation.

Fuel Filters and Water Separator

The overhaul kit process should also include replacing both the primary fuel filter and the fuel/water separator. This combination ensures that both large and small particulates, as well as water contamination, are removed from the diesel fuel system—protecting the injectors, fuel rail, and combustion chamber from wear and damage.

Tools for Rebuild: Make Installation Efficient and Accurate

Feeler Gauge for Valve Calibration

Precision matters when reassembling a Cummins QSX engine. A feeler gauge set from 0.002" to 0.025" is essential for accurately setting intake and exhaust valve lash during the top-end assembly. Proper calibration ensures optimal combustion, reduced emissions, and extended component life.

Piston Ring Assembly Tool

The piston ring compressor helps ensure correct and damage-free installation of the piston assemblies into the cylinder liners. This tool prevents ring breakage and improper seating, both of which can cause premature engine wear.

Filter Removal Wrenches

Installing new filters is straightforward—but removal of used filters from an old engine can be a challenge. Diesel Pro Power provides specialized wrenches to assist with oil and fuel filter removal:

• Fuel Filter Removal Wrench – Compatible with QSX spin-on fuel filters ranging from 3-7/16" to 3-3/4".

• Oil Filter Removal Wrench – Designed for oil filters ranging from 4-21/32" to 5-5/32" diameter.

Both tools help minimize damage to the filter housing and make removal faster and cleaner.

Engine Monitoring Tools & Maintenance Products

Radiator Cleaner

During a rebuild, it’s critical to ensure the cooling system is clean and ready to handle post-overhaul heat loads. A radiator cleaner helps remove corrosion and buildup that can reduce heat transfer efficiency. It’s especially useful when engines are used in dusty or high-mineral environments.

Temperature Switch for Engine Monitoring

This engine-safe temperature switch is pre-calibrated to close at 205°F. It can be integrated with a warning light or shutdown system, adding an extra layer of protection for rebuilt Cummins QSX engines operating under high thermal stress.

Optional Mechanical & Electrical Gauges

Once the rebuild is complete, it’s important to track oil pressure, coolant temperature, voltage, and other operating parameters. Diesel Pro Power offers a selection of mechanical and electrical gauges (available in 12V and 24V versions) for accurate engine monitoring during break-in and ongoing operation. These gauges can be installed in-panel or externally for quick diagnostics.

Why Choose Diesel Pro Power for QSX Overhaul Kits?

1. Engine-Specific Compatibility

Our QSX overhaul kits are matched to specific CPL configurations, piston designs, and component requirements. You don’t have to guess whether a part will fit or if you’ve got the right components—we’ve already handled that.

2. High-Quality Materials

We supply kits manufactured to OEM specifications using forged steel pistons, nitrided rings, and high-temperature gasket materials—perfect for engines operating in severe-duty environments.

3. Same-Day Shipping & Global Reach

Need your rebuild parts fast? Diesel Pro Power offers same-day shipping on all in-stock parts. We ship globally to over 180 countries and support customers across construction, energy, marine, and heavy equipment industries.

4. Trusted by 40,000+ Customers

With over 40,000 satisfied customers around the world, we’ve earned a reputation for reliability, product knowledge, and industry-leading service. Whether you’re a fleet manager, technician, or operator, you can count on Diesel Pro to deliver the parts and support you need.

Rebuilding a QSX Engine: What Else Should You Replace?

Camshaft Bearings & Bushings

While not always included in a standard rebuild kit, it’s good practice to inspect and replace the camshaft bushings or bearings in the QSX block—especially if the engine has high mileage or has experienced lubrication issues.

Oil Cooler & Thermostats

Thermal stability is vital after a rebuild. Inspect the oil cooler for cracks, internal clogging, or corrosion. Replace thermostats as a preventative measure to ensure the engine warms up and regulates correctly.

Injectors and Fuel Pump

Many QSX rebuilds include replacing or remanufacturing injectors. If injectors are reused, they should be professionally tested to ensure correct spray pattern and fuel delivery. The fuel pump should also be evaluated for wear or pressure fluctuations.

Break-In Procedure for QSX Engines Post-Rebuild

To maximize the life and performance of your Cummins QSX engine after a rebuild, follow a consistent break-in procedure:

1. Use break-in oil for the first 50–100 hours. Avoid synthetic oil during this period to allow piston rings to seat properly.

2. Monitor engine load and avoid extended idling. Vary RPMs and avoid full-throttle acceleration during early hours.

3. Check for leaks, gasket weeping, and filter tightness after the first 10 hours.

4. Perform an oil and filter change after the first 100 hours.

Following these steps ensures your overhaul delivers maximum performance and longevity.