Vehicle Compatibility (For Hyundai/Kia 2.4L G4KJ GDI Engines):
(Fitment Note: Designed strictly for 2.4L Theta II Gasoline Direct Injection (GDI) G4KJ engines. Please verify your engine code and OE part numbers before purchasing.)
Compatible Vehicles for Hyundai (2.4L G4KJ):
2011-2016 Hyundai Sonata
2014-2019 Hyundai Tucson
2017-2018 Hyundai Santa Fe Sport
Compatible Vehicles for Kia (2.4L G4KJ):
2011-2018 Kia Optima
2014-2020 Kia Sorento
2014-2019 Kia Sportage
Interchange/OE Part Numbers: 23111-2G200, 23111-2G230, 23510-2G500, 23510-2G540, 23510-2G520, 21020-25120, 21020-2G120, 23060-2G410.
What's Included in the Package List:
- 1x 2.4L G4KJ Crankshaft
- 4x Heavy-Duty Connecting Rods
- 4x Engine Pistons (Includes Piston Pins & Clips)
- 1x Main Bearing Set (10 Halves / 5 Pairs)
- 1x Rod Bearing Set (8 Halves / 4 Pairs)
- 1x Thrust Washer Set (2 Halves)
- 1x Piston Ring Compressor Tool & 1x Piston Ring Pliers
Recover from Theta II Engine Knock: Master 2.4L G4KJ Bottom End Rebuild Kit
Is your Hyundai or Kia 2.4L G4KJ engine suffering from the notorious Theta II rod knock, spun bearings, or catastrophic bottom-end failure? Don't let a seized rotating assembly condemn your vehicle. This premium Bottom End Rebuild Kit provides the exact high-quality internal components required to cure these common failures and breathe new life into your engine block. Designed strictly for the 2.4L Gasoline Direct Injection engine, this package is the smartest way to rebuild your bottom end and restore factory-spec reliability.
A proper bottom-end rebuild demands heavy-duty, precisely matched components to withstand the intense combustion pressures of direct injection. At the core of this package is a precision-machined 2.4L G4KJ replacement crankshaft. To prevent future rod failures, we have included four upgraded, heavy-duty connecting rods paired with four complete engine piston assemblies (pre-matched with pins and clips). To ensure flawless, friction-free rotation, this package is rounded out with a comprehensive main bearing set (10 halves), a rod bearing set (8 halves), and thrust washers. For your convenience during assembly, we have also included a piston ring compressor tool and piston ring pliers.
(IMPORTANT INSTALLATION NOTE: This bottom end kit does NOT include piston rings or engine gaskets. It is designed strictly to rebuild the rotating assembly of 2.4L Theta II Gasoline Direct Injection (GDI) G4KJ engines. Please carefully verify your engine code and OE part numbers before purchasing to ensure proper fitment for your vehicle.)
Engineered to effectively cure the Theta II rod bearing failure and save you from an expensive complete engine swap. This kit flawlessly fits the 2011-2016 Hyundai Sonata, 2014-2019 Tucson, and 2017-2018 Santa Fe Sport. It is equally compatible with 2011-2018 Kia Optima, 2014-2020 Sorento, and 2014-2019 Sportage models. Rebuild your engine block the right way with BTSCAR's premium internal components and get your vehicle safely back on the road.
Free standard U.S. shipping
Eligible orders ship free to physical street addresses in the contiguous 48 states and Washington, DC. Orders normally process within 1 business day; transit is estimated at 3–5 business days, for 4–6 business days total after ordering. Business days exclude weekends and U.S. public holidays. Delivery estimates are not guaranteed. Alaska, Hawaii, U.S. territories, international destinations, P.O. Boxes and APO/FPO addresses are not supported.
Fulfillment and tracking
Eligible orders are fulfilled through Amazon Multi-Channel Fulfillment (MCF). BTSCAR remains the seller and handles customer service. Tracking is emailed after dispatch.
30-day returns and exchanges
Request an eligible return within 30 days of delivery. Standard returns must be new, unused, uninstalled and complete with original packaging. BTSCAR supplies a free prepaid return label, including for eligible change-of-mind returns, and charges no restocking fee. Contact support@btscar-us.com for authorization before returning anything; use only our label and instructions.
Refunds
After an eligible return is received and inspected, the refund is issued to the original payment method within 7 days. Bank posting times may be longer.
Full policies: https://btscar-us.com/policies/shipping-policy and https://btscar-us.com/policies/refund-policy
12-month limited warranty
Eligible products purchased directly from btscar-us.com are covered for 12 months from delivery against verified defects in materials or workmanship under normal automotive use.
Installed products
Installation does not automatically void warranty coverage. Installed items are not eligible for standard returns, but covered defects may qualify for warranty service. Incorrect installation, inadequate lubrication, contamination, overheating, misuse, racing, modifications and normal wear are excluded. Labor, diagnosis, towing and consequential expenses are excluded to the extent permitted by law. Statutory consumer rights remain unaffected.
Claim support
Email support@btscar-us.com with your order number, product or SKU, vehicle details and a description with photos or video. We may request reasonable installation or diagnostic information. Approved claims may receive replacement parts, an equivalent replacement, or a refund if no suitable replacement is available. We provide a prepaid label when an approved warranty item must be returned. Wait for our instructions before shipping.
Customer service
Phone / WhatsApp: +86 158 1943 1912. Daily, 10:00 AM–10:00 PM (GMT+8). We aim to respond within 24 hours; this is a target, not a guarantee.
Full warranty: https://btscar-us.com/pages/warranty-policy
