Restore hybrid powertrain efficiency with this precision built Hyundai Sonata G4KK Remanufactured Engine. Production technicians align-hone aluminum block casting G4KK to preserve crankshaft journal geometry across the engine bay envelope. This 2.4L 4-Cylinder 16-Valve DOHC Atkinson cycle platform requires strict verification of square VVT oil holes prior to initial startup to protect variable camshaft phasers from starvation.

High-pressure die-cast aluminum block casting G4KK contains centrifugal cast iron cylinder liners honed for thermal stability under high electrical load transitions. A forged steel crankshaft spins on precision-machined tri-metal main bearings to control journal clearance within 0.0012in. Aluminum DOHC cylinder heads house sixteen valves, high-pressure direct-injection ports, and dual variable valve timing actuators. The crated package measures 250 lbs with crated envelope dimensions of 36in length by 36in width by 36in height and holds 4.6 quarts oil.

Key Features of Hyundai G4KK

Hybrid repair shops buy Hyundai G4KK remanufactured engine long blocks to restore traction motor synchronization. Technicians install this remanufactured G4KK long block replacement to cure bearing knock.

- Block casting G4KK receives CNC deck milling to secure multi-layer steel head gasket compression seals.
- Square VVT oil passage ports receive ultrasonic cleaning to ensure full oil flow to cam phasers.
- Micro-polished crankshaft journals hold 0.0003in TIR to withstand severe hybrid start-stop engine cycles.
- Tri-metal connecting rod bearings maintain 0.0012in oil clearance to prevent hydrodynamic bearing breakdown.
- Diamond plateau cylinder honing creates a crosshatch angle that seats piston rings within 500 miles.
- DOHC cylinder heads receive precision valve seat cutting to hold 0.001in valve runout.
- Threaded oil gallery plugs replace press-fit plugs to eliminate high-pressure engine oil loss.

Dyno Load Precision Machining Tolerances

Dynamometer load testing validates 159 HP at 5,500 RPM and 154 ft-lbs torque output at 4,500 RPM on our computer testing cell. Machine shop inspectors confirm crankshaft journal runout below 0.0003in TIR while rod bearing oil clearance measures 0.0012in. CNC cylinder bore honing holds piston-to-bore clearance at 0.0011in to prevent cold cylinder slap. Hot oil pressure maintains 60 PSI at 3,000 RPM with engine coolant stabilized at 192°F. Mechanical cylinder pressure gauges confirm balanced compression between 185 PSI and 190 PSI across all four combustion chambers.

Vehicle Fitment Drivetrain Guide

This remanufactured engine fits 2011 Hyundai Sonata Hybrid models equipped with the 2.4L 2359cc L4 Atkinson cycle hybrid powertrain and square VVT oil hole block casting G4KK. It bolts to 6-Speed Automatic hybrid transmission transaxles with integrated electric traction motor assemblies. This specific long block does not fit 2012 to 2015 round VVT hole hybrid engines, non-hybrid 2.4L G4KJ direct-injection Sonata sedans, or turbocharged 2.0L G4KH vehicle platforms.

Installation Protocol Service Requirements

De-energize the high-voltage hybrid battery system and inspect inverter coolant lines before aligning the engine block with the transaxle bellhousing. Never operate this hybrid Atkinson cycle engine in off-road buggies or custom forced-induction race chassis lacking hybrid ECU controls. Technicians must clean hybrid drive clutch surfaces prior to final assembly.

- Pressure-prime the internal oil galleries with a pressurized tank before initial crank rotation to protect dry cam phasers.
- Flush the factory break-in motor oil and replace the spin-on oil filter at 500 miles.
- Verify camshaft phaser timing response and inspect inverter cooling circuits at the 3,000 miles service interval.

Warranty Terms Core Return Policy

Our standard 3-Year Unlimited-Mile warranty protects parts and machine shop labor against internal mechanical defects. We coordinate free prepaid freight pickup for your rebuildable core inside a 30-day return window. Each crated shipment contains the assembled long block core, pre-installed timing components, oil pan, and valve cover.