Introducing the Cummins QSK78
The Cummins QSK78 is a high-performance 78-liter, 18-cylinder V-configuration diesel engine delivering up to 3500+ horsepower (2610 kW). Designed for the most demanding applications including mining haul trucks, data center power generation, marine propulsion, and heavy industrial equipment.
| Engine type | 4-cycle, V configuration, turbocharged and low-temperature aftercooled diesel engine |
|---|---|
| Cylinder block | Cast iron, 18-cylinder configuration |
| Bore x stroke | 170 mm x 190 mm |
| Displacement | 77.6 L / 4735 in3 |
| Engine power reference | 3300-3500 hp / 2461-2610 kW for QSK78 engine applications, depending on rating and configuration |
| Torque reference | 10157-14077 lb-ft / 13771-19086 N-m, depending on rating and configuration |
| Fuel system reference | Direct injection diesel fuel system; generator-set references include triple-element 10-micron filtration with water separator |
| Common applications | Mining haul trucks, off-highway trucks, heavy-duty trucks, rail, power generation, marine support, oil and gas, and heavy-duty industrial power systems |
Cummins QSK78 Engine Parts We Can Quote
Please provide the part number, engine serial number, photos of the used parts, or a complete parts list. We can help you find suitable parts and provide a quote for genuine parts based on your maintenance needs.
| System | Common QSK78 Parts | Best For |
|---|---|---|
| Fuel System | Injectors, fuel pumps, fuel lines, fuel filters, seals, control components | Power loss, hard starting, smoke, uneven cylinder performance |
| Air Intake & Turbocharging | Turbochargers, gaskets, clamps, air filters, intake pipes, charge-air components | Low boost pressure, high exhaust temperature, compressor damage |
| Cooling System | Water pumps, thermostats, coolant filters, hoses, fan drive parts, heat exchanger items | Overheating, coolant leakage, heavy-load operation in hot environments |
| Lubrication System | Oil pumps, oil coolers, oil filters, pressure sensors, gaskets, valves | Low oil pressure, bearing protection, scheduled maintenance |
| Cylinder Block & Head | Cylinder liners, pistons, piston rings, bearings, valves, guides, head gaskets | Overhaul projects, compression loss, oil consumption, major repair |
| Electrical & Sensors | ECM-related items, harnesses, speed sensors, temperature sensors, pressure sensors | Fault codes, unstable operation, monitoring and protection issues |
| Overhaul & Maintenance Kits | Gasket kits, seal kits, liner kits, piston kits, filter kits, emergency spare kits | Planned shutdowns, engine rebuilds, fleet maintenance inventory |
Provide various solutions for different use cases
| Buyer Situation | Recommended Compatible Parts | Why It Helps |
|---|---|---|
| Mine site emergency stock | Fuel filters, oil filters, coolant filters, belt-related items, pressure sensors, temperature sensors, gasket/seal kits | Supports fast troubleshooting when equipment is far from central warehouses. |
| Mining haul truck maintenance | Air filters, fuel injectors, turbocharger gaskets, coolant system parts, oil pressure sensors, temperature sensors, seals, mounting-related service items | Supports engines working with high dust load, long uphill hauls, high exhaust temperature, and repeated heavy payload cycles. |
| Heavy-duty truck fleet service | Filter kits, fuel system parts, sensors, belts, hoses, oil system parts, coolant system parts, selected emergency spare parts | Helps fleet service teams reduce wrong-part orders and keep truck maintenance inventory more predictable. |
| Generator set planned service | Filter kits, oil system parts, coolant system parts, sensors, turbocharger gaskets, maintenance consumables | Helps service teams prepare before load-bank testing or scheduled shutdowns. |
| Engine overhaul project | Cylinder liners, pistons, rings, bearings, head gaskets, valve train parts, water pumps, oil pumps | Reduces missing-item risk during rebuild and avoids expensive downtime extensions. |
| Marine or remote operation | Critical sensors, fuel system parts, cooling system parts, gasket kits, selected fast-moving items | Creates a compact onboard or remote-site spare set for urgent field repair. |
Reduce Wrong-Part Risk Before You Pay
QSK78 engines may vary by configuration, CPL, application, and build list. We recommend confirming parts by ESN, part number, BOM, or old part photos before order confirmation.
1️⃣Send Information
Share your part number, engine serial number, nameplate photo, old part photo, or maintenance list.
2️⃣Confirm Fitment
We check available details against the engine configuration and clarify uncertain items before quoting.
3️⃣Quote Options
Receive original or high-quality options with quantity, lead time, packing method, and shipment support.
4️⃣Pack & Ship
Parts are checked, labeled, protected, and prepared for air, express, sea, or consolidated shipment.
