KIA 3674-3674 Piston Connecting Rod 2.4L M182

( Manufacturer Part Number: 3674-3674 ), ( Type: Piston ), ( Items Included: Connecting Rod ), ( Country Of Origin: United States )

Review KIA 2.4l Piston And Connecting Rod #3674 3674 fits OPTIMA 2016–2020

The **Kia 3674-3674 piston and connecting rod assembly (M182 engine, 2.4L, 2016 2020 Optima)** is a precision-engineered component designed to deliver optimal performance, durability, and reliability within the high-stress environment of the Optima s GDI (Gasoline Direct Injection) powertrain. This critical assembly consists of a **forged steel piston** and a **high-strength forged connecting rod**, both meticulously crafted to withstand the intense thermal and mechanical forces generated during combustion cycles. The piston features a **honeycomb-type piston pin boss** for enhanced rigidity, reducing distortion under high loads, while its **titanium-nitride (TiN) coated crown** minimizes friction and wear, improving fuel efficiency and extending engine life. The **3-piece connecting rod** is forged from high-grade alloy steel, ensuring exceptional strength-to-weight ratio and resistance to fatigue, which is crucial for maintaining structural integrity under the repeated stress of engine operation. Together, these components form a robust linkage that efficiently transfers power from the cylinder to the crankshaft while maintaining minimal clearance, reducing oil consumption and preventing premature wear. This assembly is a direct-fit replacement for the original equipment manufacturer (OEM) parts, ensuring seamless integration with the 2.4L M182 engine found in the 2016 2020 Kia Optima, including both naturally aspirated and turbocharged variants. Whether used in a rebuild, performance upgrade, or routine maintenance, this piston and connecting rod set is engineered to meet or exceed OEM specifications, providing drivers with the confidence of a dependable and high-performance drivetrain.

### **Pros and Cons of Buying a Kia 2.4L Piston/Connecting Rod (Part Number 3674-3674, M182, for 2016-2020 Optima)**

1. **OEM Quality** Kia s aftermarket parts are generally reliable and meet the same standards as original equipment manufacturer (OEM) components. This ensures proper fitment and durability.

2. **Warranty Coverage** Kia s aftermarket parts often come with a warranty (typically 12-24 months), providing peace of mind against premature failure.

3. **Cost-Effective Alternative** Compared to brand-new OEM parts, this aftermarket option is significantly cheaper while maintaining good quality.

4. **Compatibility** Specifically designed for the 2016-2020 Optima with a 2.4L engine (M182), reducing the risk of incorrect sizing or installation issues.

5. **Ease of Installation** These parts are engineered to fit standard tools and procedures, making them accessible for DIY mechanics or professional shops.

6. **Performance Reliability** High-quality forged pistons and connecting rods help maintain engine strength, reducing the risk of catastrophic failure if installed correctly.

7. **Availability** Widely stocked by auto parts retailers and online suppliers, ensuring easy procurement.

1. **Potential Quality Variations** While generally reliable, aftermarket parts can sometimes have slight inconsistencies in machining or material compared to OEM components, though this is rare with reputable brands.

2. **Installation Complexity** Replacing pistons and connecting rods requires advanced mechanical skills, proper tools (like a piston compressor and torque wrench), and experience to avoid damage to the engine.

3. **Labor Costs** If not doing the work yourself, labor charges for this repair can be high (often $1,000 $2,000 depending on the shop).

4. **Additional Repairs May Be Needed** If the engine has been damaged (e.g., bent rods, cracked blocks), other components (like bearings, seals, or gaskets) may need replacement simultaneously, increasing costs.

5. **Engine Condition Assessment Required** Before purchasing, it s crucial to confirm the root cause of the failure (e.g., oil starvation, overheating, or manufacturing defect) to ensure the fix addresses the underlying issue.

6. **Limited Longevity Guarantee** While the parts themselves are durable, the overall engine s lifespan depends on maintenance history, driving habits, and other factors beyond just the piston/rod replacement.

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The **Kia 2.4L piston/connecting rod (3674-3674, M182)** is a **strong aftermarket alternative** to OEM parts for the 2016-2020 Optima, offering a balance of quality, cost savings, and warranty protection. However, the decision to buy should be made after:

- **Verifying the engine s condition** (no hidden damage like a cracked block or seized bearings).

- **Confirming the failure cause** (e.g., oil leaks, timing issues, or overheating).

- **Budgeting for labor** (if not DIY) and potential additional repairs.

- **Choosing a reputable supplier** (e.g., RockAuto, Dorman, or Kia s official aftermarket brand).

If the engine is otherwise healthy and the failure is isolated to the piston/rod assembly, this part is a **solid, cost-effective solution**. If the engine has sustained significant damage, a full rebuild or engine replacement may be more prudent.

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1. **If you re mechanically inclined and confident in your skills**, purchase the **Kia 3674-3674 piston/connecting rod set** from a trusted supplier (e.g., RockAuto, Dorman, or a local auto parts store with good reviews). Ensure you also buy:

- **New bearings, seals, and gaskets** (if not already included).

- **High-quality engine oil and filter** (to prevent future issues).

- **A torque wrench and proper tools** (if not already owned).

2. **If you re not comfortable with engine disassembly**, take the car to a **reputable mechanic or Kia dealership** for an assessment. They can confirm if the part alone is sufficient or if a full rebuild is needed. Compare quotes from multiple shops to ensure fair pricing.

3. **If the engine has a history of oil-related failures (e.g., oil leaks, low oil pressure)**, address those issues first (e.g., replace the oil pump, seals, or timing chain) to prevent recurrence.

4. **Consider a used/rebuilt engine** as an alternative if the repair cost approaches or exceeds the value of the vehicle, especially if the car has high mileage or poor maintenance history.

**Final Verdict:** For a **healthy 2016-2020 Optima with a 2.4L engine experiencing a piston/rod failure**, this aftermarket part is a **good, budget-friendly choice** provided the rest of the engine is in good condition. If in doubt, prioritize professional diagnosis before purchasing.

Details:

Happy buying. We ask that you please choose the option I changed my mind if decide to return. Maybe a little dusty from storage use and have few minor scratches. Please review all pictures carefully and read the before buying.

For Sale is a 2016 2020 Kia Optima 2.4L Piston And Connecting Rod #3674, This an Original part, OEM, not aftermarket.

part #: 36743674 prices

• $88.00-$89.00

specifications pistonringro:

• for models: Optima
• for makes: Kia
• for years: 2016-2020
• mpn: 3674-3674
• type: Piston
• items included: Connecting Rod
• country of origin: United States

general pistonringro:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Pistons Rings

returns pistonringro:

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

payments pistonringro:

• cash
• other
• credit card: Discover
• wallet: Paypal

offer pistonringro:

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

seller pistonringro:

• city: Rancho Cordova, California
• rating: 99.0%
• # reviews: 13604

shipping pistonringro:

• cost: $12.99
• transit: 4-7 Days
• carrier: USPS
• type: Fixed
• class: Expedited
• service: USPS Priority Mail

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