HYUNDAI 23121-2G551 Crankshaft Gear Sprocket Sport G4KJ 2.4L

( Manufacturer Part Number: 23121-2G551 ), ( Part Type: Crankshaft Gear Sprocket ), ( Vintage Part: No ), ( Country Of Origin: Korea, South )

Review HYUNDAI Oem Crankshaft Gear Sprocket Fe Sport 2.4l fits SANTA 2017–2018

The **Hyundai 23121-2G551 G4KJ Crankshaft Gear Sprocket** is a precision-engineered, high-performance component specifically designed to ensure seamless operation within the **2017-2018 Hyundai Genesis G70 (FE Sport) 2.4L Gamma (G4KJ) engine**. This critical timing system part plays a pivotal role in synchronizing the crankshaft s rotational motion with the camshaft, maintaining optimal engine timing for peak performance, fuel efficiency, and longevity. Crafted from **high-grade steel** and subjected to rigorous heat treatment and machining processes, this sprocket is built to withstand the intense mechanical stresses of modern high-revving engines, delivering reliable durability even under demanding driving conditions. Its **serrated teeth design** ensures smooth engagement with the timing chain, reducing wear and minimizing the risk of chain slippage or premature failure, which is particularly important in turbocharged or high-performance applications. The sprocket s **precision-machined fit** guarantees a snug, interference-free installation on the crankshaft flange, preventing backlash and ensuring consistent timing accuracy across all engine speeds. Whether used in routine maintenance, performance upgrades, or as a direct replacement for a worn or damaged original part, this Hyundai-specific sprocket is engineered to restore factory-level reliability and performance, helping to preserve the integrity of the engine s critical timing components. Its compatibility with the **G4KJ engine family** including the 2.4L naturally aspirated or turbocharged variants makes it an essential aftermarket solution for owners seeking to maintain or enhance their vehicle s drivetrain health.

**Pros and Cons of purchasing a Hyundai 23121-2G551 G4KJ Crankshaft Gear Sprocket for a 2017-2018 Ford Focus ST 2.4L**

1. **Direct Fitment** This part is specifically designed for the 2.4L EcoBoost engine (G4KJ) used in the 2017-2018 Ford Focus ST, ensuring compatibility without modification.

2. **OEM Quality** As a Hyundai part (likely for the Genesis G70 or similar turbocharged engines), it is manufactured to meet or exceed original equipment standards, reducing the risk of premature failure.

3. **Turbocharged Engine Support** The 2.4L EcoBoost engine relies on precise timing and crankshaft gear alignment to maintain turbo efficiency and engine longevity. A high-quality sprocket ensures proper timing chain tension and synchronization.

4. **Durability** Hyundai s aftermarket parts are generally built to withstand the stresses of turbocharged operation, including high RPMs and turbo lag, which are common in the Focus ST.

5. **Warranty Coverage** Many reputable sellers offer warranties (e.g., 1-2 years or lifetime), providing peace of mind against defects.

6. **Ease of Installation** The part is straightforward to replace, requiring only basic tools and a bit of mechanical knowledge. Installation guides are widely available online.

7. **Cost-Effective Alternative** Compared to OEM parts, this aftermarket sprocket is often significantly cheaper while maintaining reliability.

1. **Potential Counterfeit Risk** Some sellers may offer fake or low-quality replicas, especially on platforms like eBay or Amazon. Buying from a trusted dealer (e.g., RockAuto, Summit Racing, or a local Ford/performance shop) reduces this risk.

2. **Mixed Reviews on Fitment** While designed for similar engines, some owners report slight variations in fitment or chain tensioning, which may require additional adjustments (e.g., chain guides or tensioners).

3. **Limited Availability of OEM Parts** If the OEM sprocket is still available, it may be more expensive, but it guarantees exact fitment. However, aftermarket parts like this one are often a reliable substitute.

4. **Installation Challenges** If the timing chain or guides are worn, replacing just the sprocket may not fully resolve timing issues. A full timing chain service might be recommended for optimal performance.

5. **Turbo-Specific Considerations** The 2.4L EcoBoost s turbo system is sensitive to timing chain wear. If the sprocket is not installed correctly or is of poor quality, it could lead to turbo lag, misfires, or even catastrophic engine damage if the timing chain skips.

The Hyundai 23121-2G551 G4KJ crankshaft gear sprocket is a **strong aftermarket alternative** for the 2017-2018 Ford Focus ST s 2.4L EcoBoost engine. It offers OEM-like quality at a lower cost and is widely compatible with turbocharged applications. However, buyers must ensure they purchase from a reputable source to avoid counterfeit parts. If the engine has significant wear in the timing chain system, a full timing chain service may be advisable alongside the sprocket replacement.

- **Buy from a trusted supplier** (e.g., RockAuto, Summit Racing, or a local Ford performance shop) to avoid counterfeit parts.

- **Inspect the timing chain and guides** before installation. If they show excessive wear, replace them as well.

- **Follow installation instructions carefully**, ensuring the sprocket is aligned correctly with the crankshaft and timing marks.

- **Consider a full timing chain service** if the engine has high mileage or symptoms of chain wear (e.g., rattling, turbo lag, or check engine lights for timing-related codes).

- **Monitor engine performance post-installation** for any unusual noises or issues, and address them promptly.

This part is a **good choice for a reliable, cost-effective upgrade**, provided proper precautions are taken during purchase and installation.

Details:

May be a little dusty from storage use and have few minor scratches. This is an original part oem not aftermarket. FITS: from 2017 Santa fe sport 2.4l G4KJ. Please be 100% sure this is the correct part for your vehicle.

Please review all the pictures and read carefully. FOR SALE IS: gear.

part #: 231212g551 prices

• $44.95-$297.89

specifications cranshafengin:

• for models: Santa
• for makes: Hyundai
• for years: 2017-2018
• mpn: 23121-2g551
• part type: Crankshaft Gear Sprocket
• vintage part: No
• country of origin: Korea, South

seller cranshafengin:

• rating: 98.0%
• # reviews: 6206
• city: Rancho Cordova, California

returns cranshafengin:

• policy: Returns Accepted
• paid by: Buyer
• time: 30 Days

offer cranshafengin:

• availability: In Stock
• options: Ship-to-home
• started: May 5, 2026
• sold: 0
• quantity: 1
• best offers: True

shipping cranshafengin:

• service: USPS Ground Advantage
• class: Standard
• transit: 3-8 Days
• type: Fixed
• cost: $6.00
• carrier: USPS

payments cranshafengin:

• credit card: Diners-club
• wallet: Apple-pay
• other

general cranshafengin:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

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