Kawasaki 80Z7 Wheel Loader Long Block Diesel Crate Engine Choate Performance

Kawasaki 80Z7 Wheel Loader Long Block Engine

The QSB6.7 Cummins platform is the heart of the Kawasaki 80Z7, engineered to provide the high-torque performance and rapid response required for heavy-duty earthmoving. Whether you’re operating in a high-production quarry or a demanding construction site, this remanufactured long block is built to withstand the rigors of high-cycle loading.

Key Features and Fixes

• Vibration Mitigation: A fully balanced rotating assembly ensures your wheel loader operates smoothly. This precision balancing protects your transmission and hydraulic pump drives from the parasitic vibrations that cause premature fatigue in industrial drivetrains.

• Enhanced Valve Integrity: Features all-new, upgraded exhaust valves designed to eliminate high-heat separation. This prevents catastrophic engine failure during the sustained high-load cycles common in heavy material handling.

• Industrial-Grade Protection: Billet freeze plugs are installed to eliminate the "rot-out" and weeping common with standard brass or steel plugs, ensuring your cooling system remains intact through extreme temperature fluctuations.

• Precision Remanufacturing: Unlike a standard "patch job" overhaul, this long block is blueprint-machined to solve OEM discrepancies, providing a more reliable foundation than a standard factory replacement.
  

Machining Process:

At Choate Engineering Performance, we remanufacture QSB6.7 engines to surpass original factory specifications. Our process involves rigorous CNC blueprinting to ensure the ultimate reliability required for high-uptime industrial applications.

Engine Block Machining:

Each of our engine blocks are CNC blueprint machined using state-of-the-art CNC machines. This process ensures perfect dimensions, precise tolerances, and optimal alignment. This starts with decking the surface of the block to achieve the necessary flatness and smoothness (Ra 30 or better) required for flawless sealing with MLS head gaskets. The cylinders are then diamond honed to an extremely tight tolerance to match the piston diameter (within the nearest 0.0001 inch). Following honing, the main bearing bores are line honed to establish a true, straight centerline for the crankshaft. Finally, the cylinder bores are bored to a true 90 degree angle from the crankshaft centerline.

Cylinder Head Machining:

Our cylinder heads are fully machined and enhanced in-house to improve airflow and reliability. Each head is first magnafluxed and pressure tested to ensure they are free of any cracks or leaks. The surface is then precision decked to an extremely smooth finish, guaranteeing the necessary flatness for a perfect seal with MLS head gaskets. Internally, the valve seats are machined to optimize airflow and prevent common failures, and the entire valve train geometry is blueprinted to specific tolerances to reduce lifter preload and prolong component life.

Rotational Assembly Balancing:

The balancing of the rotational assembly is crucial for eliminating vibration and maximizing engine longevity. This precision work involves checking and correcting the balance of the crankshaft, connecting rods, and pistons. The crankshaft is thoroughly checked for run-out and inspected for fatigue before being polished and ground to strict concentricity tolerances (0.0005 or less) to ensure the new bearings receive the best possible surface. Rods are inspected and conditioned, and all bearing clearances checked to ensure proper fitment with the new bearings. Each of the pistons, rings, and pin retainers are meticulously weight matched (to a tolerance of 2 grams or less) prior to crank balancing. Then the entire assembly is dynamically balanced on specialized equipment. This ensures that the engine runs smoothly, minimizing stress on the bearings, and extends the overall life of the components.

Components and Parts:

Engine Core Components

• Cylinder Block
• Crankshaft
• Connecting Rods
• Camshaft
• Pistons
• Reman Cylinder Head
• Pushrods
• New Main Bearings
• New Rod Bearings
• New Cam Bearings
• Main Bolts
• Head Studs
• Rockers
• Billet Freeze Plugs
• New Oil Pump
• Upper Oil Pan
• Lower Oil Pan

Gaskets and Seals

• New Head Gaskets
• Rear Main Seal
• Front Gear Housing

Cylinder Head Components

• New Valve Guides
• New Socket Plug
• New Oversized Valve Seats
• New Threaded Plugs

Industrial Reliability: 2 Year / 2,000 Hour Warranty

On the job site, reliability isn't just a luxury, it’s the difference between profit and loss. At Choate, we stand behind the precision engineering of our QSB6.7 Long Block Engines with a comprehensive 2-Year / 2,000-Hour Warranty.

We understand that wheel loaders face some of the most punishing environments, from high-idle periods to wide-open throttle transitions under heavy load. Our warranty is designed to give you total peace of mind while you work. Whether you are managing a large fleet or operating as an independent contractor, we ensure your investment is protected against defects in materials and workmanship.