MERCEDES A2740121T186 Engine Motor Crankshaft Crank Shaft Benz X247 GLB35 1K

( Manufacturer Part Number: A2740121T186 ), ( Vintage Part: No ), ( Country Of Origin: Germany )

Review MERCEDES benz Engine Motor Crankshaft Crank Shaft Oem 1k fits AMG

The **Mercedes-Benz A2740121T186 X247 GLB 3.5L AMG Engine Crankshaft (Part Number: 1K)** is a precision-engineered, high-performance component designed exclusively for the iconic **Mercedes-AMG GLB 3.5L V6 Biturbo engine (M177 DE35LA)**. This crankshaft is a critical element of the engine s drivetrain, responsible for converting the linear motion of the pistons into rotational force, which is then transmitted to the transmission and ultimately the wheels. Crafted from **high-grade forged steel**, this crankshaft is engineered to withstand the extreme stresses of high-revving AMG performance, delivering exceptional durability, strength, and reliability under demanding driving conditions. The **five-main-bearing design** ensures optimal load distribution, minimizing vibration and maximizing efficiency, while the **precision-machined journals and counterweights** are meticulously balanced to enhance smooth operation and longevity. Whether installed in a stock or modified GLB 3.5L AMG, this crankshaft is built to meet the rigorous demands of both daily driving and spirited performance, ensuring seamless power delivery and maintaining the engine s high-performance integrity. As a direct OEM replacement, it adheres to Mercedes-Benz s exacting standards, guaranteeing compatibility with the original engine assembly and supporting components. Ideal for both original equipment replacement and performance upgrades, this crankshaft is a testament to Mercedes-AMG s commitment to engineering excellence, delivering uncompromising performance and reliability for enthusiasts seeking the pinnacle of luxury and power.

### **Pros and Cons of buying a Mercedes-Benz A2740121T186 X247 GLB 3.5L AMG Engine Crankshaft (Part Number: 1K)**

1. **OEM Quality and Reliability** This is an original equipment manufacturer (OEM) part, meaning it meets Mercedes-Benz s strict engineering standards. It is designed to match the performance, durability, and fitment of the original component, reducing the risk of premature failure or compatibility issues.

2. **Extended Engine Life** The crankshaft is a critical component in the engine s power transmission system. A high-quality, properly installed crankshaft can prevent catastrophic engine failure (such as rod knock or bearing damage) and extend the overall lifespan of the engine, especially if the original part was worn or damaged.

3. **Performance Integrity** The AMG 3.5L V6 engine is a high-performance unit known for its power and responsiveness. A genuine crankshaft ensures that the engine maintains its intended power output, torque, and smooth operation without compromises in performance.

4. **Warranty Coverage** Purchasing from an authorized Mercedes-Benz dealer or a reputable supplier often includes warranty protection, providing peace of mind against defects in materials or workmanship.

5. **Prevents Costly Repairs** If the original crankshaft was failing, it could lead to severe internal engine damage (e.g., broken rods, damaged bearings, or cylinder block cracks). Replacing it proactively can save thousands in repair costs associated with a seized or destroyed engine.

6. **Resale Value Protection** Maintaining the engine with OEM parts helps preserve the vehicle s value, as potential buyers will trust that the car has been well-maintained with genuine components.

7. **Compatibility Guarantee** Unlike aftermarket parts, which may require additional modifications or adjustments, the OEM crankshaft is designed specifically for the X247 GLB 3.5L AMG engine, ensuring a perfect fit without compatibility issues.

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1. **High Cost** OEM parts are significantly more expensive than aftermarket alternatives. The crankshaft for this engine can cost **$1,500 to $3,000 or more**, depending on the supplier and labor costs. This expense may be prohibitive for some owners, especially if the engine is not severely damaged.

2. **Labor-Intensive Installation** Replacing a crankshaft requires a full engine teardown, which includes removing the engine from the vehicle, disassembling the lower end, machining the crankshaft journals (if necessary), and reassembling everything with precision. This process typically takes **10 20 hours of labor**, adding to the total cost.

3. **Potential for Hidden Damage** If the engine was previously damaged (e.g., from a seized crankshaft or bearing failure), additional repairs (such as new bearings, rods, or a cracked block) may be required, increasing the overall expense beyond just the crankshaft replacement.

4. **Opportunity Cost** The time and money required for this repair may be better spent on other vehicle projects or upgrades, depending on the owner s priorities. For example, if the engine is nearing the end of its useful life, a full rebuild or engine swap might be more cost-effective.

5. **Risk of Overkill for Minor Issues** If the crankshaft failure is isolated (e.g., a single journal wear issue), some mechanics might argue that a partial rebuild (e.g., replacing only the bearings and seals) could be a more economical solution. However, if the crankshaft itself is cracked or worn beyond repair, replacement is necessary.

6. **Supplier Dependence** Purchasing from unauthorized or unscrupulous suppliers could result in counterfeit or substandard parts, voiding warranties and risking further engine damage. It s crucial to buy from **Mercedes-Benz approved dealers, authorized remanufacturers, or trusted specialty shops**.

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- The crankshaft is confirmed to be cracked, bent, or severely worn.

- The engine is still in good overall condition and worth preserving.

- The owner has the budget for OEM parts and professional labor.

- The goal is to restore the engine to factory specifications for reliability and performance.

- The engine has extensive internal damage (e.g., broken rods, scored cylinders, or a cracked block), a full rebuild or engine swap may be more practical.

- The vehicle is older and the cost of repair exceeds its resale value.

- The owner is unsure about the extent of the damage and wants a second opinion before committing.

1. **Verify the Diagnosis** Before purchasing, confirm that the crankshaft is indeed the root cause of the issue. A **dynamometer test, bore scope inspection, or professional engine analysis** should be conducted to assess the full condition of the engine.

2. **Get Multiple Quotes** Obtain estimates from **at least two reputable Mercedes-Benz specialists or AMG performance shops** to compare pricing and labor practices. Ensure they use **OEM parts** and follow proper procedures (e.g., crankshaft balancing, proper bearing selection, and torque specifications).

3. **Consider Remanufactured vs. New** While new OEM crankshafts are ideal, **high-quality remanufactured crankshafts** (from companies like **Mercedes-Benz Remanufacturers or specialty suppliers**) can offer cost savings while maintaining reliability. Ensure the remanufacturer has a strong reputation.

4. **Budget for Additional Repairs** If the engine is being rebuilt, account for **new bearings, seals, gaskets, and possibly a new oil pump or timing chain** if they are worn. Some shops offer **engine rebuild packages** that include these components.

5. **Weigh Long-Term vs. Short-Term Needs**

- If the vehicle is a **daily driver or a project car with high mileage potential**, the investment in an OEM crankshaft is justified.

- If the car is **a collector s item or a low-mileage show car**, prioritize **preservation over performance** and consider whether the engine is worth restoring.

6. **Explore Alternative Solutions**

- **Engine swap** (e.g., installing a used but reliable 3.5L AMG engine from a wrecked car).

- **Turbocharged or supercharged aftermarket builds** (if performance is the primary goal).

- **Selling the vehicle as-is** if the repair costs exceed its value.

For **owners committed to restoring their X247 GLB 3.5L AMG engine to peak condition**, replacing the crankshaft with an **OEM or high-quality remanufactured part** is the **best long-term solution** for reliability and performance. However, the decision should be **data-driven** based on a thorough engine inspection, cost-benefit analysis, and alignment with the vehicle s intended use. If the engine is beyond repair, alternative solutions may be more practical. Always prioritize **quality over cost** when dealing with critical components like the crankshaft.

Details:

MERCEDES X247 GLB35 AMG ENGINE MOTOR CRANKSHAFT CRANK SHAFT OEM 1K. Item will come as pictured. CAME OFF A 2023 GLB 35 1K MILES.

part #: a2740121t186 prices

• $149.99-$599.99

specifications cranshafengin:

• for models: Amg
• for makes: Mercedes
• mpn: A2740121t186
• vintage part: No
• country of origin: Germany

general cranshafengin:

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

shipping cranshafengin:

• service: UPS Ground
• carrier: UPS
• transit: 6-11 Days
• type: Fixed
• cost: $50.00
• class: Standard

seller cranshafengin:

• city: Elk Grove, California
• # reviews: 495
• rating: 100.0%

offer cranshafengin:

• quantity: 1
• started: May 23, 2026
• availability: In Stock
• options: Ship-to-home
• sold: 0

payments cranshafengin:

• wallet: Paypal
• credit card: Mastercard
• other

returns cranshafengin:

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

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