CAT C15 6NZ 550HP Rebuilt Diesel Engine 2026 – New Head – Warranty – Video

Caterpillar C15 6NZ 550 HP Rebuilt Diesel Engine
Professionally rebuilt Caterpillar C15 6NZ diesel engine rated at 550 HP. This engine has undergone an extensive rebuild using new internal and external components and will be inspected and tested prior to sale.
The engine includes a new cylinder head, in-frame overhaul kit, new camshaft, new injectors, oil pump, manifold, and additional rebuild components.
🔧 Engine Specifications
Manufacturer: Caterpillar
Model: C15
Serial Prefix: 6NZ
Displacement: 15.2L
Configuration: Inline 6-Cylinder
Horsepower: 550 HP
Condition: Rebuilt
Turbocharged: Yes
ECM: Included, if shown with engine
Running Video: Available
🔩 Rebuild Details
This C15 6NZ has received extensive machine work and replacement components, including:
New Cylinder Head
Block Machined / Decked
New In-Frame Overhaul Kit
New Pistons
New Liners
New Piston Rings
New Main & Rod Bearings
New Camshaft
New Injectors
Oil Pump
Manifold
New Gaskets & Seals
Additional internal components inspected and replaced as required
Engine professionally assembled and prepared for testing
🔍 Condition & Testing
This engine is being sold as a REBUILT engine, not a used takeout.
Before shipment, the engine will be:
Tested • Inspected • Cleaned • Painted • Prepared for Shipping
A running video will be available so the buyer can review engine operation before shipment.
🛡️ 6-Month Limited Warranty
This rebuilt engine includes a 6-month limited warranty.
Warranty coverage applies to specified covered components and is parts only – labor is not included.
A written warranty agreement outlining all coverage, requirements, limitations and exclusions will be provided and must be signed by the customer.
🎥 Running Video Available
Running video available upon request.
Video can be provided before shipment to demonstrate engine operation.
🚚 Nationwide Shipping
Nationwide freight shipping available.
Engine will be secured to a custom-built pallet, wrapped and properly prepared for transportation.
Preparation time: At least 7 business days.
Shipping costs will be quoted at the time of shipment, as freight rates may change weekly.
⚠️ Important
Buyer is responsible for verifying that the Caterpillar C15 6NZ configuration, horsepower, ECM calibration and accessories are compatible with their truck.
Engine serial number and additional specifications can be provided upon request.
Sold as pictured.