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Cummins X15 Specs
The Cummins X15 is a 14.9-liter inline-6 diesel engine designed for high-output performance in long-haul tractors and heavy-duty vocational trucks. Built to deliver both power and reliability, the X15 family supports a wide range of torque and horsepower demands. This guide serves as a complete reference for all Cummins X15 specs, focusing on key technical details, bolt torque specs, and maintenance values critical for service professionals and equipment managers.
X15 Series Overview
The Cummins X15 engine platform comes in three main variants: the Performance Series, Efficiency Series, and Productivity Series.
- Efficiency Series: Tuned for long-haul fuel economy, with output between 400–605 horsepower and torque ranging from 1,450–2,050 lb-ft.
- Productivity Series: Designed for mixed-duty and vocational use. Similar output (450–605 hp), but optimized for better throttle response and heavier loads.
- Performance Series: Shares the same 400–605 hp range, but prioritizes peak torque delivery and power curves for demanding applications.
All variants meet EPA 2024 and Euro VI emissions standards and offer fully integrated aftertreatment systems.
General Engine Specifications
The Cummins X15 engine specs include a displacement of 14.9 liters, with 6 inline cylinders. Bore measures 5.39 inches and stroke comes in at 6.65 inches. The block and cylinder head are both made of cast iron. Dry weight is approximately 2,950 lbs, with the aftertreatment system adding another 400 lbs depending on configuration.
Compression ratio is 18.9:1. The engine uses a high-pressure common-rail fuel system and an advanced cooling circuit. The governor is set to 2,100 RPM for rated speed and idle is typically 600–700 RPM.
Torque Specification Tables
Below are the Cummins X15 bolt torque specs broken down by system and component. All values are listed in both lb-ft and N-m for convenience. Use calibrated tools and always follow the recommended sequence to avoid component stress or sealing issues.
Head Bolt Torque Specs
- Torque: 520 lb-ft / 705 N-m
- Requires hardened washers and a multi-stage torque sequence
Flywheel Bolt Torque Specs
- Torque: 600 lb-ft / 813 N-m
- Applies to single- and dual-mass flywheels (Grade 10.9 bolts)
Exhaust Manifold Torque Specs
- Torque: 45 lb-ft / 61 N-m
- Use steel-core graphite gaskets
Injector Torque Specs
- Torque: 40 lb-ft / 54 N-m
- Replace O-rings and seals during service
Oil Pan Torque Specs
- Torque: 20 lb-ft / 27 N-m
- Follow a crisscross tightening pattern with RTV sealant or composite gasket
Valve Cover Torque Specs
- Torque: 18 lb-ft / 25 N-m
- Clean surfaces and inspect gasket before install
Intake Manifold Torque Specs
- Torque: 25 lb-ft / 34 N-m
- Applies to aluminum studs or bolts
Water Pump Torque Specs
- Torque: Housing bolts – 30 lb-ft / 41 N-m; Pulley bolts – 50 lb-ft / 68 N-m
Clutch Bolt Torque Specs
- Torque: 45 lb-ft / 61 N-m
- Inspect flywheel run-out before installing
Main Bearing Torque Specs
- Torque: 750 lb-ft / 1,017 N-m
- Final step includes a torque angle of 90°
Rocker Shaft Torque Specs
- Torque: 40 lb-ft / 54 N-m
- Use lock nuts with serrated washers
Harmonic Balancer Bolt Torque Specs
- Torque: 285 lb-ft / 387 N-m plus torque angle
Cam Gear Bolt Torque Specs
- Torque: 600 lb-ft / 813 N-m
- Torque-to-yield bolt—do not reuse
Turbocharger Bolt Torque Specs
- Torque: Turbine housing – 35 lb-ft / 47 N-m; Compressor housing – 25 lb-ft / 34 N-m
- Replace gaskets during service
Front Cover Bolt Torque Specs
- Torque: 20 lb-ft / 27 N-m
- Use anaerobic sealant for proper sealing
100th Anniversary Edition (700 HP) Specifications
The Cummins X15 100th Anniversary Edition specs feature exclusive calibration and hardware:
- Horsepower: 700 hp @ 2,100 RPM
- Torque: 2,050 lb-ft @ 1,200 RPM
- High-flow injectors, tuned ECM, and unique turbo mapping
Maintenance and Oil Pressure Specs
- Idle Oil Pressure: 40 psi / 276 kPa
- Full Load Oil Pressure: 70 psi / 483 kPa
- Recommended Oil: 15W-40 CK-4
- Oil Change Interval: 50,000 miles
- Fuel Filter Replacement: 25,000 miles
Valve Adjustment and Crankcase Pressure
- Valve Lash (Cold): 0.016 in intake / 0.020 in exhaust
- Crankcase Pressure: 1.5–3.0 psi
- Adjust valves during scheduled service intervals
Final Thoughts
Following the correct Cummins X15 torque specs ensures performance, longevity, and component integrity. Every torque value plays a role in preventing leaks, reducing stress, and maintaining warranty compliance. For the most accurate and up-to-date data, always verify specs with an authorized Cummins dealer.
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