2015-2018 Hyundai Tucson, Santa Fe Sport, Sonata, Santa Fe and Kia Sportage, Optima, Sorento G4KJ 2.4L Remanufactured Engine

Description

Halt connecting rod journal bearing seizure, eliminate metallic debris in oil passages, and maintain 50 PSI hot cruise oil pressure across demanding commercial fleet routes using the Hyundai Kia G4KJ 2.4L Remanufactured Engine engineered for 2015 to 2018 Hyundai Sonata, Santa Fe, and Kia Optima commercial fleet vehicles. This 16-valve direct-injected DOHC Theta II platform restores high fuel economy and multi-shift durability.

Cast from high-density aluminum alloy with cast-in iron cylinder liners, this Theta II block incorporates a two-piece structural lower ladder frame that halts crankcase distortion under load. A micro-polished forged steel crankshaft turns within tri-metal bearings, linked to forged steel connecting rods and graphite-coated hypereutectic aluminum pistons with dish crowns. Decks receive an Ra 30 finish for MLS gasket sealing. Dry mass measures 310 lbs with a 5.0-quart capacity aluminum oil pan.

Key Features of Hyundai Kia G4KJ

Metropolitan fleet operators buy Hyundai Kia G4KJ remanufactured engine packages to lower vehicle maintenance expenses and keep commercial service crossovers operating on schedule. Every remanufactured long block undergoes vacuum decay testing to guarantee total fluid circuit separation before crate departure.

• Gasoline Direct Injection atomizes fuel at 2175 PSI to maximize high-compression combustion efficiency
• Dual continuous variable valve timing phasers continuously adjust intake and exhaust camshafts under load
• 0.0011 to 0.0018 inch main bearing clearances maintain solid hydrodynamic lubrication film strength
• Multi-layer steel cylinder head gaskets maintain combustion seals across extreme summer transit heat
• High-flow internal trochoid oil pumps channel pressurized lubricant to overhead camshaft journals
• Induction-hardened valve seats prevent valve face recession during sustained highway cruise operations
• Precision rotating package balancing protects Hyundai Kia G4KJ driveline parts from vibration

G4KJ GDI Operational Combustion Limits

Operating lubricant pressure produces 16 to 22 PSI during warm idle and expands to 45 through 60 PSI at 2800 RPM cruise speeds. Internal coolant temperatures stabilize between 188°F and 202°F through regulated cross-flow cooling circulation. This 2.4-liter Theta II GDI engine outputs 185 horsepower at 6000 RPM and 178 lb-ft continuous torque at 4000 RPM with an 11.3:1 compression ratio. Cylinder cranking pressure measures between 175 and 190 PSI across all four chambers. The cooling system rejects 2400 BTU per minute during loaded highway transit.

G4KJ Crankshaft Transaxle Alignment Thresholds

A 6-bolt rear crankshaft flange mounts flush to factory 6-speed automatic transaxle flexplates. Measured crankshaft thrust endplay checks out between 0.0030 and 0.0070 inches. The 0.984-inch front crankshaft snout features a single keyway to position the timing chain drive gear and harmonic balancer, holding true accessory drive belt pulley alignment.

G4KJ Fleet Lubricant Servicing Protocols

Technicians must prime the engine oil pump prior to first startup by cranking the starter without ignition until oil pressure warning lamps extinguish. Fill the crankcase with 5W-20 or 5W-30 motor oil meeting API service standards. This production engine is not engineered for turbo conversions, nitrous injection, or competitive track racing.

• Check crankcase oil level and coolant tank fluid volume each shift before driving
• Drain break-in motor oil and install fresh oil filter after 500 initial miles
• Perform routine oil and filter changes every 3750 miles during commercial transit cycles

G4KJ Commercial Warranty Freight Manifest

Commercial fleet purchasers receive a 3-Year / 100,000-Mile commercial fleet warranty covering structural casting and internal moving components. The heavy-duty wood crate contains one remanufactured long block engine, a complete engine install gasket set, spark plug well seals, front timing cover seals, dyno test documentation, and priming instructions.