{"product_id":"70z-iv-long-block-diesel-crate-engine-choate-performance","title":"Kawasaki 70Z-IV Wheel Loader Long Block Diesel Crate Engine Choate Performance","description":"\u003ch2\u003e\u003cstrong\u003eKawasaki 70Z-IV Wheel Loader Long Block Engine\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cb\u003eB5.9-C industrial engine\u003c\/b\u003e is the legendary workhorse powering the Kawasaki 70Z-IV. Known for its mechanical simplicity and relentless torque, this engine is designed to handle the high-stress cycles of earthmoving and material handling. Our remanufactured long block takes this proven platform and applies modern precision machining to eliminate factory weak points and maximize your machine's uptime.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eKey Features and Fixes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eVibration Mitigation:\u003c\/b\u003e A fully balanced rotating assembly ensures your wheel loader operates with minimal harmonic distortion. This protects your hydraulic pumps, transmission, and mounting hardware from the steady vibration that leads to component fatigue and costly leaks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eEnhanced Valve Integrity:\u003c\/b\u003e We install all-new, upgraded exhaust valves designed to withstand the high-heat cycles of constant digging and loading. This prevents valve-head separation, a common cause of catastrophic failure in heavy-duty industrial applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eReliable Cooling Integrity:\u003c\/b\u003e Billet freeze plugs are installed to replace the standard stamped steel or brass plugs. This prevents the \"blow-out\" or corrosion-related leaks that can lead to overheating and engine seizure in the middle of a shift.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eOptimized for Load:\u003c\/b\u003e Every aspect of this build is engineered to handle the rapid throttle transitions and high-torque demands characteristic of the Kawasaki 70Z-IV’s duty cycle.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eMachining Process:\u003c\/h3\u003e\n\u003cp\u003eAt Choate Engineering Performance, we don’t just \"fix\" engines; we remanufacture the B5.9-C to surpass original factory specifications using advanced CNC blueprinting.\u003c\/p\u003e\n\u003ch5\u003e\u003cstrong\u003eEngine Block Machining:\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cp\u003eEach 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.\u003c\/p\u003e\n\u003ch5\u003e\u003cstrong\u003eCylinder Head Machining:\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cp\u003eOur 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.\u003c\/p\u003e\n\u003ch5\u003e\u003cstrong\u003eRotational Assembly Balancing:\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eComponents and Parts:\u003c\/h3\u003e\n\u003ch5\u003e\u003cstrong\u003eEngine Core Components\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder Block\u003c\/li\u003e\n\u003cli\u003eCrankshaft\u003c\/li\u003e\n\u003cli\u003eConnecting Rods\u003c\/li\u003e\n\u003cli\u003eCamshaft\u003c\/li\u003e\n\u003cli\u003ePistons\u003c\/li\u003e\n\u003cli\u003eReman Cylinder Head\u003c\/li\u003e\n\u003cli\u003ePushrods\u003c\/li\u003e\n\u003cli\u003eNew Main Bearings\u003c\/li\u003e\n\u003cli\u003eNew Rod Bearings\u003c\/li\u003e\n\u003cli\u003eNew Cam Bearings\u003c\/li\u003e\n\u003cli\u003eMain Bolts\u003c\/li\u003e\n\u003cli\u003eHead Studs\u003c\/li\u003e\n\u003cli\u003eRockers\u003c\/li\u003e\n\u003cli\u003eBillet Freeze Plugs\u003c\/li\u003e\n\u003cli\u003eNew Oil Pump\u003c\/li\u003e\n\u003cli\u003eUpper Oil Pan\u003c\/li\u003e\n\u003cli\u003eLower Oil Pan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cstrong\u003eGaskets and Seals\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eNew Head Gaskets\u003c\/li\u003e\n\u003cli\u003eRear Main Seal\u003c\/li\u003e\n\u003cli\u003eFront Gear Housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cstrong\u003eCylinder Head Components\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eNew Valve Guides\u003c\/li\u003e\n\u003cli\u003eNew Socket Plug\u003c\/li\u003e\n\u003cli\u003eNew Oversized Valve Seats\u003c\/li\u003e\n\u003cli\u003eNew Threaded Plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eConstruction-Grade Confidence: 2 Year \/ 2,000 Hour Warranty\u003c\/h3\u003e\n\u003cp\u003eIn the construction world, if the loader isn't moving, the job isn't making money. At Choate, we stand behind the durability of our \u003cb\u003eB5.9-C Long Block Engines\u003c\/b\u003e with a comprehensive \u003cb\u003e2-Year \/ 2,000-Hour Warranty\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp\u003eWe understand that the Kawasaki 70Z-IV is often the centerpiece of a fleet, subjected to dust, heat, and heavy loads. Our warranty is built to provide peace of mind to owner-operators and fleet managers alike, ensuring that your investment is protected by the highest standards of American engineering and craftsmanship.\u003c\/p\u003e","brand":"Choate Performance","offers":[{"title":"Default Title","offer_id":66581774008624,"sku":"CEP70Z4L","price":10200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/2680\/1200\/files\/KawasakiLongBlockEngine1.png?v=1779726562","url":"https:\/\/choateperformance.com\/products\/70z-iv-long-block-diesel-crate-engine-choate-performance","provider":"choateperformance","version":"1.0","type":"link"}